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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

Performance Analysis of Random Complementary Code Based MIMO-CDMA System

Chou, En-hung 29 August 2006 (has links)
This is a research on Performance Analysis of Random Complementary Code Based MIMO-CDMA System. In the first instance we discuss the produce method of random complementary codes by the basic matrix and pole matrix. Pole matrix is the produce method of Walsh Hadamard matrix. We discuss the properties of random complementary codes by the pole matrix and realize its auto-correlation and cross-correlation are perfect. Apply random complementary codes on Distributed Users and Antennas. Random complementary codes have the ideal auto-correlation and cross-correlation by way of direct-sequence spreading system, so it can solve multi-path interference and multi-access interference effectively. Apply Space-Time Block Codes on Distributed time and Antennas in the same user. Systems combine RCC with STBC. I design STBC RCC-CDMA System and two receivers. We discuss Signal Synthesis Receiver and Distributed Antennas Receiver with Rayleigh fading channel. In Chapter 2, we start to introduce random complete complementary codes and its property to resist interferences in different transmission. Chapter 3 is the introduction Performance Analysis of Random Complementary Code Based MIMO-CDMA System with full correlated Rayleigh fading channel. Chapter 4 is the introduction Performance Analysis of Random Complementary Code Based MIMO-CDMA System with multi-path Rayleigh fading channel. Chapter 5 is the introduce conclusion and to research a goal in the future.

Complementary Coded Cooperative Networking

Shih, Hsiang-Yi 10 September 2007 (has links)

Design of I/Q Column-wise Complementary Code

Chen, Hong-lun 07 August 2008 (has links)

Chip Level Space-Time-Frequency Complementary Code Design

Wu, Yi-Zhang 05 August 2008 (has links)

Performance of Complementary Coded CDMA Performance of Complementary Coded CDMA Systems Using Modified Jakes Fading Channel Simulator

Li, Jyun-Sian 08 September 2009 (has links)

An OFDM System Based on Complementary Code CDMA and its Performance Analysis

Lin, Che-Min 12 August 2004 (has links)
In this thesis, the feasibility of complete complementary code based OFDM CDMA system is studied. The complete complementary code is composed of several sets of auto-complementary codes, any two of which are cross-complementary codes. The perfect correlation between code sets is the distinguishing feature of complete complementary code. In this thesis, we designed a new OFDM CDMA system architecture according the property of complete complementary code. The most obvious characteristic is that the bit stream in the new system is no longer aligned one bit after another in time. Instead, a new bit will start only after one chip delay relative to the previous bit, which is spread by an element code of complete complementary code. The proposed new CDMA architecture can offer an MAI-free operation in both down-link (synchronous channel) and up-link (asynchronous channel) transmission under the AWGN channel, because of the use of the CC-codes. However, due to the special spreading modulator-offset stacking modulator (OSM), we¡¦ll encounter a ¡§ multi-level ¡¨ problem . If we can¡¦t solve this problem , the linear power amplifier will not be able to support the whole system . Hence , we try to clip the multilevel into a smaller magnitude . And also , we try some other mapping methods to solve the multilevel problem .

Use of Parallel Computing Techniques to Search for Perfectly Orthogonal Complementary Codes

Chang, Chin-hsiang 02 September 2005 (has links)
Because using the perfect orthogonal code in CDMA system means elimination of multi-path interference and multiple access interference, we will discuss this aspect in this thesis. At first, we address a algorithm to how to search a flock of perfect orthogonal code, which consisting of many codes have a characteristic of perfect auto-correlation and perfect cross-correlation to each other. Following, we will compare perfect orthogonal code we find with the present complementary codes include complete complementary code (CCC), super complementary code (SCC), and two-dimensional orthogonal variable spreading code (2D-OVSF code). Considering that the run time of searching perfect orthogonal code is long in case of high processing gain (PG), we construct a PC cluster based Linux O.S or Windows O.S for the operation of parallel program to faster our production of perfect orthogonal code.

Complementary Coded CDMA and Its Applications in V2V Communications

Tsao, Yao-Lin 10 September 2007 (has links)
First, the introduction of IEEE 802.11p will be made. There are some issues of IEEE 802.11p under vehicular environment And its OFDM system suffers much loss in time-varying fading channel. To mitigate the performance degradation, we combine Columnwise Complementary Codes with IEEE 802.11p to resist the interference caused by high-speed mobile channel. Finally, we will show some simulation results of CCC-OFDM system compared with the original OFDM system working in the IEEE 802.11p environment.

Complementary Coded CDMA and Its Applications in Optical Communications

Ming, Kuo-yu 10 September 2007 (has links)

Angular and Temporal Diversity Combining in CDMA systems

Lee, Hung-yang 15 August 2009 (has links)

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