Thesis (MScEng)--Stellenbosch University, 2011. / ENGLISH ABSTRACT: This thesis presents the study, analysis and design of electronically tunable filters, that can be tuned over a wide frequency range (20-500MHz), for use in a direct sampling receiver. The final design does not have to be a single filter, but may be comprised of a filter bank which enables switching between the filters. The band of interest is too low to use normal transmission lines and lumped elements have to be used. Different topologies that can implement Coupled Resonator filters with lumped elements are investigated. Devices that can be used for tuning are also investigated and varactor diodes are found to be the most suitable tuning devices currently available. Two filters, one at the high-end and one at the low-end of the band, were designed and built, both using varactor diodes. These filters perform well in terms of tuning range, but achieving low losses with current technologies in this band remains difficult. / AFRIKAANSE OPSOMMING: Hierdie tesis meld die studie, analise en ontwerp van elektronies verstelbare filters, wat verstelbaar is oor ’n wye band (20-500MHz), vir gebruik in ’n direk-monster-ontvanger. Die finale ontwerp hoef nie ’n enkele filter te wees nie, maar kan bestaan uit ’n filterbank wat skakeling tussen die filters toelaat. Die betrokke band is te laag vir die gebruik van normale transmissielyne en diskrete komponente moet gebruik word. Verskillende topologieë wat gekoppelde resoneerder filters implementeer met diskrete komponente is ondersoek. Verstelbare komponente word ook ondersoek en varaktor diodes blyk die mees geskikte verstelbare komponent wat huidig beskikbaar is in hierdie band. Twee filters, een aan die hoë kant en een aan die lae kant van die band, is ontwerp en gebou, beide met varaktor diodes. Hierdie filters het wye verstelbare bereik, maar dit is steeds moeilik om verliese te beperk met die huidige tegnologie.

Multicarrier (MC) Modulation attracts a lot of attention for high speed wireless transmissions because of its capability to cope with frequency selective fading channels turning the wideband transmission link into several narrowband subchannels whose equalization, in some situations, can be performed independently and in a simple manner. Nowadays, orthogonal frequency division multiplexing (OFDM) with the cyclic prefix (CP) insertion is the most widespread modulation among all MC modulations, and this thanks to its simplicity and its robustness against multipath fading using the cyclic prefix. Systems or standards such as ADSL or IEEE802.11a have already implemented the CP-OFDM modulation. Other standards like IEEE802.11n combine CP-OFDM and multiple-input multiple-output (MIMO) in order to increase the bit rate and to provide a better use of the channel spatial diversity. Nevertheless, CP-OFDM technique causes a loss of spectral efficiency due to the CP as it contains redundant information. Moreover, the rectangular prototype filter used in CP-OFDM has a poor frequency localization. This poor frequency localization makes it difficult for CP-OFDM systems to respect stringent specifications of spectrum masks.To overcome these drawbacks, filter-bank multicarrier (FBMC) was proposed as an alternative approach to CP-OFDM. Indeed, FBMC does not need any CP, and it furthermore offers the possibility to use different time-frequency well-localized prototype filters which allow much better control of the out-of-band emission. In the literature we find several FBMC systems based on different structures. In this thesis, we focus on the Saltzberg's scheme called OFDM/OQAM (or FBMC/OQAM). The orthogonality constraint for FBMC/OQAM is relaxed being limited only to the real field while for OFDM it has to be satisfied in the complex field. Consequently, one of the characteristics of FBMC/OQAM is that the demodulated transmitted symbols are accompanied by interference terms caused by the neighboring transmitted data in time-frequency domain. The presence of this interference is an issue for some MIMO schemes and until today their combination with FBMC remains an open problem.The aim of this thesis is to study the combination between FBMC and MIMO techniques, namely spatial multiplexing with ML detection. In the first part, we propose to analyze different intersymbol interference (ISI) cancellation techniques that we adapt to the FBMC/OQAM with MIMO context. We show that, in some cases, we can cope with the presence of the inherent FBMC interference and overcome the difficulties of performing ML detection in spatial multiplexing with FBMC/OQAM. After that, we propose a modification in the conventional FBMC/OQAM modulation by transmitting complex QAM symbols instead of OQAM ones. This proposal allows to reduce considerably the inherent interference but at the expense of the orthogonality condition. Indeed, in the proposed FBMC/QAM,the data symbol and the inherent interference term are both complex. Finally, we introduce a novel FBMC scheme and a transmission strategy in order to avoid the inherent interference terms. This proposed scheme (that we call FFT-FBMC) transforms the FBMC system into an equivalent system formulated as OFDM regardless of some residual interference. Thus, any OFDM transmission technique can be performed straightforwardly to the proposed FBMC scheme with a corresponding complexity growth. We develop the FFT-FBMC in the case of single-input single-output (SISO) configuration. Then, we extend its application to SM-MIMO configuration with ML detection and Alamouti coding scheme.

No description available.

Reconfigurable computing architectures are well suited for the dynamic data flow processing requirements of software-defined radio. The software radio concept has quickly evolved to include spectrum sensing, awareness, and cognitive algorithms for machine learning resulting in the cognitive radio model. This work explores the application of reconfigurable hardware to the physical layer of cognitive radios using non-contiguous multi-carrier radio techniques. The practical tasks of spectrum sensing, frame detection, synchronization, channel estimation, and mutual interference mitigation are challenges in the communications and the computing fields that are addressed to optimally utilize the capacity of opportunistically allocated spectrum bands. FPGA implementations of parameterizable OFDM and filter bank multi-carrier (FBMC) radio prototypes with spectrum awareness and non-contiguous sub-carrier allocation were completed and tested over-the-air. Sub-carrier sparseness assumptions were validated under practical implementation and performance considerations. A novel algorithm for frame detection and synchronization with mutual interference rejection applicable to the FBMC case was proposed and tested. / Ph. D.

[ES] La red de sexta generación (6G) es la solución potencial para satisfacer los requisitos exponencialmente crecientes de los servicios y aplicaciones emergentes. La plataforma 6G espera ofrecer altas velocidades de datos, conectividad ultra alta y baja latencia en función de los indicadores clave de rendimiento (KPI) requeridos. La tecnología de comunicación por luz visible (VLC) representa una tecnología clave para la red 6G, pero requiere una técnica de modulación avanzada eficiente para cumplir con dichos requisitos. En las últimas décadas, las señales ópticas basadas en el esquema de multiplexación por división de frecuencia ortogonal (OFDM) han atraído mucha atención y se han convertido en la modulación más popular entre varios esquemas de acceso multiportadora, gracias a su robustez y simplicidad frente a la cancelación por trayectos múltiples utilizando el prefijo cíclico (CP). Una de las formas de onda más prometedoras para redes de próxima generación es la técnica de modulación Filter Bank MultiCarrier (FBMC). El principal beneficio del esquema FBMC es que no depende de CP y de un gran número de muestras de banda de guarda, por lo tanto, emplea varias funciones de pulso localizadas en el tiempo con una alta relación de supresión de lóbulos laterales, lo que permite mejorar la eficiencia espectral y el rendimiento del sistema como factores clave en las redes ópticas de próxima generación, y proporciona una buena alternativa a la técnica CP-OFDM. Esta Tesis pretende dar un paso adelante en la propuesta de formatos de modulación para ser utilizados en sistemas VLC como tecnología habilitadora en redes 6G. Por lo tanto, se propone el sistema Flip-FBMC con un algoritmo de truncamiento para ofrecer una transmisión de alta velocidad con baja latencia Flip-FBMC mediante el uso del algoritmo de transformación ortogonal isotrópica (IOTA) y la capa PHYsical para DYnamic AccesS y filtros de radio cognitiva (PHYDYAS). En esta Tesis se propone la ecualización multitap con el fin de mitigar la Interferencia imaginaria intrínseca (IMI) en un canal con perfiles de retardos elevado en sistemas VLC de interiores. Además, se ha mejorado rendimiento de error de las señales FBMC no coherentes mediante el análisis de la propiedad de la localización de tiempo-frecuencia con la función gaussiana extendida (EGF), donde el factor de dispersión desempeña un papel crucial en la determinación del equilibrio entre las características espectrales y la reconstrucción óptima de la calidad de la señal. Además, la Tesis proporciona el primer análisis teórico que informa de la degradación en la estimación para varios factores de clipping basada en el impacto del nivel de interferencia imaginario fuera de la zona de primer orden que no puede ser estimada mediante el preámbulo de IAM. Sin embargo, se debe enfatizar en el valor de la técnica Flip-FBMC/IAM para proporcionar el modelo unipolar en comparación con el uso del formato FBMC óptico polarizado con corriente continua (DCO-FBMC) que sufre una reducción en la estimación de la precisión. Por lo tanto, se ha demostrado el descenso del rendimiento con el sistema DCO-FBMC debido al IMI inducido fuera de los símbolos de orden cero, y que es más evidente cuando se requieren niveles bajos de corriente DC. Desde esta perspectiva, la técnica de repetición de tramas con señales Flip-FBMC ha demostrado ser una solución importante para minimizar la interferencia inducida. Por lo tanto, en esta Tesis, la modulación Flip-FBMC con repetición de tramas y perfil de filtro PHYDYAS se propone como un candidato viable para hacer frente al rango dinámico restringido del LED, en comparación con el rendimiento de los sistemas Flip-CP-OFDM y Flip-FBMC/IAM en futuras redes 6G basadas en acceso VLC. / [CA] La xarxa de sexta generació (6G) és la solució potencial per a satisfer els requisits exponencialment creixents dels servicis i aplicacions emergents. La plataforma 6G espera oferir altes velocitats de dades, connectivitat ultra alta i baixa latència en funció dels indicadors clau de rendiment (KPI) requerits. La tecnologia de comunicació per llum visible (VLC) representa una tecnologia clau per a la xarxa 6G, però requerix una tècnica de modulació avançada eficient per a complir amb estos requisits. En les últimes dècades, els senyals òptics basats en l'esquema de multiplexació per divisió de freqüència ortogonal (OFDM) han atret molta atenció i s'han convertit en la modulació més popular entre diversos esquemes d'accés multiportadora, gràcies a la seua robustesa i simplicitat enfront de la cancel·lació per trajectes múltiples utilitzant el prefix cíclic (CP). Una de les formes d'ona més prometedores per a xarxes de pròxima generació és la tècnica de modulació Filter Bank MultiCarrier (FBMC). El principal benefici de l'esquema FBMC és que no depén de CP i d'un gran nombre de mostres de banda de guarda, per tant, empra diverses funcions de pols localitzades en el temps amb una alta relació de supressió de lòbuls laterals, la qual cosa permet millorar l'eficiència espectral i el rendiment del sistema com a factors clau en les xarxes òptiques de pròxima generació, i proporciona una bona alternativa a la tècnica CP-OFDM. Esta Tesi pretén fer un pas avant en la proposta de formats de modulació per a ser utilitzats en sistemes VLC com a tecnologia habilitadora en xarxes 6G. Per tant, es proposa el sistema Flip-FBMC amb un algoritme de truncament per a oferir una transmissió d'alta velocitat amb baixa latència Flip-FBMC mitjançant l'ús de l'algoritme de transformació ortogonal isotròpica (IOTA) i la capa PHYsical per a DYnamic AccesS i filtres de ràdio cognitiva (PHYDYAS). En aquesta Tesi, es proposa l'equalització multitap per als sistemes VLC en interiors per a mitigar la interferència imaginària intrínseca (IMI) en un canal amb perfils de retards elevat. A més, el rendiment d'error dels senyals FBMC no coherents es millora mitjançant l'anàlisi de la propietat de la localització de temps-freqüència amb la funció gaussiana estesa (EGF), on el factor de dispersió exercix un paper crucial en la determinació de l'equilibri entre les característiques espectrals i la reconstrucció òptima de la qualitat del senyal. En tal escenari, a causa del rang dinàmic limitat del díode emissor de llum (LED), la millora de la precisió de l'estimació depén dels nivells de potència dels pseudopilots amb l'ús de l'arquitectura del Mètode d'Aproximació d'Interferència (IAM) i per tant, no és adequada en sistemes VLC d'il·luminació i comunicació. A més, la Tesi proporciona la primera anàlisi teòrica que informa de la degradació en l'estimació per a diversos factors de clipping basada en l'impacte del nivell d'interferència imaginari fora de la zona de primer orde que no pot ser estimada mitjançant el preàmbul de IAM. No obstant això, s'ha d'emfatitzar en el valor de la tècnica Flip-FBMC/IAM per a proporcionar el model unipolar en comparació amb l'ús del format FBMC òptic polaritzat amb corrent continu (DCO-FBMC) que patix una reducció en l'estimació de la precisió. Per tant, s'ha demostrat el descens del rendiment amb el sistema DCO-FBMC a causa del IMI induït fora dels símbols d'orde zero, i que és més evident quan es requerixen nivells baixos de corrent DC. Des d'esta perspectiva, la tècnica de repetició de trames amb senyals Flip-FBMC ha demostrat ser una solució important per a minimitzar la interferència induïda. Per tant, en esta Tesi, la modulació Flip-FBMC amb repetició de trames i perfil de filtre PHYDYAS es proposa com un candidat viable per a fer front al rang dinàmic restringit del LED, en comparació amb el rendiment dels sistemes Flip-CP-OFDM i Flip-FBMC/IAM en futures xarxes 6G basades en accés VLC. / [EN] The sixth generation (6G) network is the potential solution to meet the exponentially increasing requirements of the emerging services and applications. The 6G platform expects to offer high data rates, ultra-high connectivity, and low latency based on the required key performance indicators (KPIs). The visible light communication (VLC) technology represents a key technology for 6G network but requires an efficient advanced modulation technique to support such requirements. In the last decades, optical signals based on Orthogonal Frequency Division Multiplexing (OFDM) scheme has attracted a lot of attention and become the most popular modulation among several multicarrier access schemes, thanks to its robustness and simplicity against multipath fading using the cyclic prefix (CP). One of the most candidate waveforms that is considered as the promising modulation technique for the next generation requirements and applications is Filter Bank MultiCarrier (FBMC) multiplexing. The major benefit of FBMC scheme is non-reliance on CP and high numbers of guard band samples, thereby, it employs several well time-frequency localized pulse functions with high side-lobe suppression ratio instead, which allows enhancing the spectral efficiency and system performance as key factors in next generation optical networks, and provides a good alternative to CP-OFDM technique. This Thesis aims to make a step forward in proposing modulation formats to be used in VLC systems as enabling technology in 6G networks. Hence, Flip-FBMC system with a truncation algorithm is proposed to offer a high-speed transmission with low latency by tackling the doubled-overhead tails at the subframes of Flip-FBMC burst by the use of the isotropic orthogonal transformation algorithm (IOTA) and PHYsical layer for DYnamic AccesS and cognitive radio (PHYDYAS) filters. Multitap equalization is proposed in this Thesis for the sake of mitigating the intrinsic imaginary interference (IMI) over a channel with high delays profile for indoor VLC system. Moreover, the error performance of non-coherent FBMC signals is enhanced by analysing the property of time-frequency localization with Extended Gaussian Function (EGF), where the spreading factor plays a crucial role in determining the trade-off between the spectral features and optimal reconstruction of signal quality. In such scenario, due to the limited dynamic range of light emitting diode (LED), improving in the accuracy of estimation depends on the power-levels of pseudo pilots with the use of Interference Approximation Method (IAM) architecture. Thereby, the analysis reveals that IAM sequence is not suitable for a real transmission scenario due to high power of IAM over the payload data which conflicts with VLC purposes of illumination and communication simultaneously. Additionally, the Thesis provides the first theoretical analysis reporting the degradation of estimation accuracy for several clipping ratios based on the impact of imaginary interference level outside the first order neighbourhood zone that cannot be estimated by IAM preamble. However, the value of Flip-FBMC/IAM technique in providing the unipolar model must be emphasized compared to the use of Direct Current biased Optical FBMC (DCO-FBMC) format that suffers from a reduction in estimating accuracy. Thereby, the downfall performance with DCO-FBMC system has been reported because of the induced IMI that spreads out the first neighbourhood symbols, which is more evident when low levels of the added DC-bias are required. From such perspective, the frame repetition technique with Flip-FBMC signals has been demonstrated as a major solution for minimizing the induced interference. Therefore, in this Thesis, Flip-FBMC/frame repetition with PHYDYAS profile is proposed as a viable candidate to cope with the restricted dynamic range of the LED, compared to the performance for each Flip-CP-OFDM and Flip-FBMC/IAM system in future 6G networks based on VLC access. / Bahaaelden, MS. (2024). Novel 5G-Modulation Formats and Their Application in Optical Wireless Communications [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/204634

Ultra wide band (UWB) is an extremely promising wireless technology for researchers and industrials. One of the most interesting is its high data rate and fading robustness due to selective frequency fading. However, beside such advantages, UWB system performance is highly affected by existing narrowband interference (NBI), undesired UWB signals and tone/multi-tone noises. For this reason, research about NBI cancellation is still a challenge to improve the system performance vs. receiver complexity, power consumption, linearity, etc. In this work, the two major receiver sections, i.e., analog (radiofrequency or RF) and digital (digital signal processing or DSP), were considered and new techniques proposed to reduce circuit complexity and power consumption, while improving signal parameters. In the RF section, different multiband UWB low-noise amplifier key design parameters were investigated like circuit configuration, input matching and desired/undesired frequency band filtering, highlighting the most suitable filtering package for efficient UWB NBI cancellation. In the DSP section, due to pulse transmitter signals, different issues like modulation type and level, pulse variety, shape and color noise/tone noise assumptions, were addressed for efficient NBI cancelation. A comparison was performed in terms of bit-error rate, signal-to-interference ratio, signal-to-noise ratio, and channel capacity to highlight the most suitable parameters for efficient DSP design. The optimum number of filters that allows the filter bandwidth to be reduced by following the required low sampling rate and thus improving the system bit error rate was also investigated.

Ultra wide band (UWB) is an extremely promising wireless technology for researchers and industrials. One of the most interesting is its high data rate and fading robustness due to selective frequency fading. However, beside such advantages, UWB system performance is highly affected by existing narrowband interference (NBI), undesired UWB signals and tone/multi-tone noises. For this reason, research about NBI cancellation is still a challenge to improve the system performance vs. receiver complexity, power consumption, linearity, etc. In this work, the two major receiver sections, i.e., analog (radiofrequency or RF) and digital (digital signal processing or DSP), were considered and new techniques proposed to reduce circuit complexity and power consumption, while improving signal parameters. In the RF section, different multiband UWB low-noise amplifier key design parameters were investigated like circuit configuration, input matching and desired/undesired frequency band filtering, highlighting the most suitable filtering package for efficient UWB NBI cancellation. In the DSP section, due to pulse transmitter signals, different issues like modulation type and level, pulse variety, shape and color noise/tone noise assumptions, were addressed for efficient NBI cancelation. A comparison was performed in terms of bit-error rate, signal-to-interference ratio, signal-to-noise ratio, and channel capacity to highlight the most suitable parameters for efficient DSP design. The optimum number of filters that allows the filter bandwidth to be reduced by following the required low sampling rate and thus improving the system bit error rate was also investigated.

In communication system environment speech signal is corrupted due to presence of additive acoustic noise, so with this distortion the effective communication is degraded in terms of the quality and intelligibility of speech. Now present research is going how effectively acoustic noise can be eliminated without affecting the original speech quality, this tends to be our challenging in this current research thesis work. Here this work proposes multi-tiered detection method that is based on time-frequency analysis (i.e. filter banks concept) of the noisy speech signals, by using standard speech enhancement method based on the proven spectral subtraction, for single channel speech data and for a wide range of noise types at various noise levels. There were various variants have been introduced to standard spectral subtraction proposed by S.F.Boll. In this thesis we designed and implemented a novel approach of Spectral Subtraction based on Minimum Statistics [MinSSS]. This means that the power spectrum of the non-stationary noise signal is estimated by finding the minimum values of a smoothed power spectrum of the noisy speech signal and thus circumvents the speech activity detection problem. This approach is also capable of dealing with non-stationary noise signals. In order to analyze the system in time frequency domain, we have implemented two different filter bank approaches such as Weighted OverLap Added (WOLA) and Fast Fourier Transform Modulated (FFTMod). The proposed systems were implemented and evaluated offline using simulation tool Matlab and then validated their performances based on the objective quality measures such as Signal to Noise Ratio Improvement (SNRI) and Perceptual Evaluation Speech Quality (PESQ) measure. The systems were tested with a pure speech combination of male and female sampled at 8 kHz, these signals were corrupted with various kinds of noises at different noise power levels. The MinSSS algorithm implemented using FFTMod filter bank approach outperforms when compared the WOLA filter bank approach.

Image coding is studied, with the work consisting of two distinct parts. Each part focuses on different coding paradigm. The first part of the research examines subband coding of images. An optimization-based method for the design of high-performance separable filter banks for image coding is proposed. This method yields linear-phase perfect-reconstruction systems with high coding gain, good frequency selectivity, and certain prescribed vanishing-moment properties. Several filter banks designed with the proposed method are presented and shown to work extremely well for image coding, outperforming the well-known 9/7 filter bank (from the JPEG-2000 standard) in most cases. Several families of perfect reconstruction filter banks exist, where the filter banks in each family have some common structural properties. New filter banks in each family are designed with the proposed method. Experimental results show that these new filter banks outperform previously known filter banks from the same family. The second part of the research explores normal meshes as a tool for image coding, with a particular interest in the normal-mesh-based image coder of Jansen, Baraniuk, and Lavu. Three modifications to this coder are proposed, namely, the use of a data-dependent base mesh, an alternative representation for normal/vertical offsets, and a different scan-conversion scheme based on bicubic interpolation. Experimental results show that our proposed changes lead to improved coding performance in terms of both objective and subjective image quality measures.

Grâce à leur capacité de faire face à la sélectivité fréquentielle des canaux de transmission, les modulations multi-porteuses (MC) attirent de plus en plus d’attention. De nos jours, la modulation OFDM avec le préfixe cyclique (CP) est la plus utilisée, et cela grâce à sa simplicité et à sa robustesse. Cependant, la technique CP-OFDM présente une perte dans l’efficacité spectrale à cause de l’introduction du CP puisqu’il contient des informations redondantes. De plus, la réponse rectangulaire du filtre de mise en forme utilisé en OFDM a une mauvaise localisation fréquentielle. Afin de surmonter ces inconvénients, la modulation multi-porteuse à base des bancs de filtres (FBMC) a été proposée en tant qu’une approche alternative à la modulation OFDM. En effet, on n’a pas besoin d’insérer un intervalle de garde, tel que le CP, dans la modulation FBMC. D’autre part, la bonne localisation fréquentielle de la réponse du filtre de mise en forme permet un meilleur contrôle de la radiation hors-bande du système. Dans la littérature, on trouve plusieurs types de la modulations FBMC basés sur différentes structures. Dans cette thèse, nous ne nous intéressons que sur le schéma de Saltzberg appelé OFDM/OQAM ou FBMC/OQAM. Dans ce schéma, les symboles envoyés sur chaque sous-porteuse sont tirés d’une constellation PAM réelle, et les symboles réels sont envoyés à une cadence de 2/T . La condition d’orthogonalité est réduite sur l’ensemble des réels uniquement. En conséquence, le symbole démodulé et égalisé est infecté par un terme d’interférence purement imaginaire. Ce terme d’interférence est une combinaison linaire des symboles transmis dans le voisinage du symbole concerné. La présence de cette interférence inhérente cause des difficultés de détection dans certains schéma multi-antennes (MIMO).L’objectif de cette thèse est d’étudier l’association de la modulation FBMC aux techniques MIMO, à savoir le multiplexage spatiale avec détection de maximum de vraisemblance (ML). Dans un premier temps, nous proposons d’analyser différentes techniques d’annulation d’interférence que nous adaptons au contexte de MIMO-FBMC. Nous montrons que, dans certains cas, nous pouvons bien retirer l’interférence et appliquer la détection ML. Ensuite, nous proposons d’apporter une légère modification dans la modulation FBMC en transmettant des symbole QAM complexes. Évidement, cela brise la condition d’orthogonalité mais nous montrons qu’ainsi la puissance d’interférence sera considérablement réduite. Enfin, nous introduisons un nouveau schéma basé sur la modulation FBMC. Ce schéma, que nous avons baptisé FFT-FBMC, transforme le modèle du système à un modèle équivalent à celui de l’OFDM. Ainsi, n’importe quelle technique multi-antennes pourra être appliquée sans aucune difficulté. D’abord, nous développons le système FFT-FBMC dans un contexte SISO, et puis nous évaluons ces performances dans le contexte MIMO. / Multicarrier (MC) Modulation attracts a lot of attention for high speed wireless transmissions because of its capability to cope with frequency selective fading channels turning the wideband transmission link into several narrowband subchannels whose equalization, in some situations, can be performed independently and in a simple manner. Nowadays, orthogonal frequency division multiplexing (OFDM) with the cyclic prefix (CP) insertion is the most widespread modulation among all MC modulations, and this thanks to its simplicity and its robustness against multipath fading using the cyclic prefix. Systems or standards such as ADSL or IEEE802.11a have already implemented the CP-OFDM modulation. Other standards like IEEE802.11n combine CP-OFDM and multiple-input multiple-output (MIMO) in order to increase the bit rate and to provide a better use of the channel spatial diversity. Nevertheless, CP-OFDM technique causes a loss of spectral efficiency due to the CP as it contains redundant information. Moreover, the rectangular prototype filter used in CP-OFDM has a poor frequency localization. This poor frequency localization makes it difficult for CP-OFDM systems to respect stringent specifications of spectrum masks.To overcome these drawbacks, filter-bank multicarrier (FBMC) was proposed as an alternative approach to CP-OFDM. Indeed, FBMC does not need any CP, and it furthermore offers the possibility to use different time-frequency well-localized prototype filters which allow much better control of the out-of-band emission. In the literature we find several FBMC systems based on different structures. In this thesis, we focus on the Saltzberg’s scheme called OFDM/OQAM (or FBMC/OQAM). The orthogonality constraint for FBMC/OQAM is relaxed being limited only to the real field while for OFDM it has to be satisfied in the complex field. Consequently, one of the characteristics of FBMC/OQAM is that the demodulated transmitted symbols are accompanied by interference terms caused by the neighboring transmitted data in time-frequency domain. The presence of this interference is an issue for some MIMO schemes and until today their combination with FBMC remains an open problem.The aim of this thesis is to study the combination between FBMC and MIMO techniques, namely spatial multiplexing with ML detection. In the first part, we propose to analyze different intersymbol interference (ISI) cancellation techniques that we adapt to the FBMC/OQAM with MIMO context. We show that, in some cases, we can cope with the presence of the inherent FBMC interference and overcome the difficulties of performing ML detection in spatial multiplexing with FBMC/OQAM. After that, we propose a modification in the conventional FBMC/OQAM modulation by transmitting complex QAM symbols instead of OQAM ones. This proposal allows to reduce considerably the inherent interference but at the expense of the orthogonality condition. Indeed, in the proposed FBMC/QAM,the data symbol and the inherent interference term are both complex. Finally, we introduce a novel FBMC scheme and a transmission strategy in order to avoid the inherent interference terms. This proposed scheme (that we call FFT-FBMC) transforms the FBMC system into an equivalent system formulated as OFDM regardless of some residual interference. Thus, any OFDM transmission technique can be performed straightforwardly to the proposed FBMC scheme with a corresponding complexity growth. We develop the FFT-FBMC in the case of single-input single-output (SISO) configuration. Then, we extend its application to SM-MIMO configuration with ML detection and Alamouti coding scheme.