The increasing number of English language learners (ELL) in Florida's public schools has brought challenges to educational leaders as they work to provide educational opportunity to these children. In 1990, several community and activist groups filed a lawsuit against the Florida Department of Education to pressure it to provide adequate English language programs in all public schools. The lawsuit resulted in Floridas META Consent Decree (MCD), a legal accord by which Florida agreed to provide adequate teacher training and educational programs, thereby improving access to equal opportunity for ELLs. ELLs are also called limited English proficient (LEP) students in other states. This term was changed in Florida because the LEP label brought with it a negative connotation as it referred to proficiency within the learning of English as a limitation rather than as an asset. The study presents a comprehensive review of the MCD and its eleven main components. Through document and content analysis, the study intended to ix determine whether Florida's 67 public school districts comply with the decree and whether policies are in place to implement the court authorized processes. The study begins with an introduction, which includes historical data and Florida demographics that relate to the issue of second language learners. A review of the literature incorporates legal cases and pertinent educational policies that have preceded the decree. / The review also examined the major political and educational barriers that English language learners (ELL) encounter in Florida, as well as the research that suggests what programs and practices are required for successful second language learning. From the impact of antiimmigrant sentiments and English-only movements, to the League of United Latin-American Citizens (LULAC) v.FL Board of Education (1990) class action lawsuit, the study investigated the status of ELL programs in the state of Florida and the debates that surrounds them.The study intended to inform fellow educational leaders of these topics so that our work on behalf of K-12 ELLs can be more effective. Recognizing and preparing for the impact that the increasing numbers of ELLs will continue to have in Florida is an integral part of becoming a well-rounded educational leader and facilitates providing the services these students require, deserve, and to which they are entitled. The study also informs policymakers and practitioners of the pending needs and provides a roadmap to improving second language learning programs and practices in Florida. / by Maria de L. Rodriguez. / Vita / Thesis (Ph.D.)--Florida Atlantic University, 2011. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2011. Mode of access: World Wide Web.

This qualitative storytelling and exploratory research design investigated the barriers, enhancers, and coping strategies to education experienced by adult Native American Indians from various Native American Indian Nations. In addition, differences between the sexes, Native American Nations, and/or languages spoken, and/or participation in cultural activities regarding barriers, enhancers, and coping strategies of Native American Indians were examined. The study with 23 adult Native American participants revealed a main theme of identity both passive and aggressive that permeated all of the thematic areas: barriers, enhancers, and coping strategies. The barriers ranged from reinventing the Native American Indian to language barriers caused by forcing Native American Indians to speak Eurowestern languages in order to survive. The educational enhancers themes described by the participants revolved around themes of people, culture, community, and the environment. Elements of Garrison' s Model (1997) on self-directed learning emerged in this study under the thematic area of coping strategies. Self-directedness was evident in the coping strategies; which included self-management (control by acknowledging the social environment in which the participants were interacting), cognitive responsibility (self-examination), and motivation (assuming personal responsibility). The role of a Native American Indian as a researcher was noted in enhancing the depth and breadth of the research. / The examination of the differences between the sexes, Native American Nations, and/or languages spoken, and/or participation in cultural activities revealed: (a) one male and five females participants described sexism as a barrier; (b) no participant expressed particular barriers with regards to the Native American Nation in which they belonged to; (c) a majority of participants expressed that language was a barrier in one form or another; (d) participants described barriers to Native American Indian cultural participation as thoughts and feelings of being "lost" and "not belonging," which is evident in identity crisis or identity diffusion. / by Enid Conley. / Thesis (Ph.D.)--Florida Atlantic University, 2008. / Includes bibliography. / Electronic reproduction. Boca Raton, FL : 2008 Mode of access: World Wide Web.

The purpose of this study was to determine principals' attitudes toward the use of culturally relevant pedagogy and culturally responsive leadership in predominately African American schools. Culturally relevant pedagogy, culturally responsive teaching, culturally responsive urban leadership, and ethnohumanist leadership are the study's theoretical underpinnings. The research question was as follows: To what extent, if any, do principals of predominately African American schools promote culturally relevant pedagogy and utilize culturally responsive leadership? The sample for this mixed methods study was secondary school principals and teachers in predominately African American schools. Seven principals and 43 teachers participated in the study. The research methods used were vignettes, interviews, surveys, content analysis, and document analysis. Vignettes containing 10 scenarios of principals performing culturally responsive leadership practices were distributed to principals who were asked to rate them with a Likert scale. In addition, principals were asked 13 open ended questions about culturally relevant pedagogy and culturally responsive leadership in an interview. Teachers were asked to complete a 10 question on-line survey about their principals' leadership from a culturally responsive perspective. Reviews of school improvement plans, principals' messages, and mission and vision statements were also conducted. / The study found that (a) principals admitted that they had a limited knowledge of the concepts of culturally relevant pedagogy and culturally responsive leadership, (b) principals theoretically viewed culturally relevant pedagogy and culturally responsive leadership as useful tools in educating African American student populations as evidenced by their responses to the vignettes, (c) principals had a general understanding of African American culture and exhibited sensitivity to the cultural needs of African American students, (d) stressed the managing of difficult students or the diffusing of problematic situations as a benefit of having teachers trained in culturally relevant pedagogy and (e) principals in the study did not actively encourage teachers to utilize culturally relevant pedagogy as a means to improve the academic achievement of African American students. / by Tressey Weaver. / Thesis (Ph.D.)--Florida Atlantic University, 2009. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2009. Mode of access: World Wide Web.

This thesis presents the design, implementation, and fabrication of an analog front-end (AFE) targeting 2x blind ADC-based receivers. The front-end consists of a combination of an anti-aliasing filter (AAF) and a 2-tap feed-forward equalizer (FFE) (AAF/FFE), the required clock generation circuitry (Ck Gen), 4 time-interleaved 4-b ADCs, and DeMUX. The contributions of this design are the AAF/FFE and the Ck Gen. The overall front-end optimizes the channel/filter characteristics for data-rates of 2-10 Gb/s. The bandwidth of the AAF is scalable with the data-rate and the analog 2-tap feed-forward equalizer (FFE) is designed without the need for noise-sensitive analog delay cells. The test-chip is implemented in 65-nm CMOS and the AAF/FFE occupies 152×86 μm2 and consumes 2.4 mW at 10 Gb/s. Measured frequency responses at data-rates of 10, 5, and 2 Gb/s confirm the scalability of the front-end bandwidth. FFE achieves 11 dB of high-frequency boost at 10 Gb/s.

This thesis presents the design, implementation, and fabrication of an analog front-end (AFE) targeting 2x blind ADC-based receivers. The front-end consists of a combination of an anti-aliasing filter (AAF) and a 2-tap feed-forward equalizer (FFE) (AAF/FFE), the required clock generation circuitry (Ck Gen), 4 time-interleaved 4-b ADCs, and DeMUX. The contributions of this design are the AAF/FFE and the Ck Gen. The overall front-end optimizes the channel/filter characteristics for data-rates of 2-10 Gb/s. The bandwidth of the AAF is scalable with the data-rate and the analog 2-tap feed-forward equalizer (FFE) is designed without the need for noise-sensitive analog delay cells. The test-chip is implemented in 65-nm CMOS and the AAF/FFE occupies 152×86 μm2 and consumes 2.4 mW at 10 Gb/s. Measured frequency responses at data-rates of 10, 5, and 2 Gb/s confirm the scalability of the front-end bandwidth. FFE achieves 11 dB of high-frequency boost at 10 Gb/s.

Thesis (M. Ed.)--University of Hong Kong, 1997. / Includes bibliographical references (leaf 58-68).

Thesis (M.Ed.)--University of Hong Kong, 1997. / Includes bibliographical references (leaves 58-68). Also available in print.

In a wireless communication system the transmitted information is subjected to a number of impairments, among which inter-symbol interference (ISI), thermal noise and fading are the most prevalent. Owing to the dispersive nature of the communication channel, ISI results from the arrival of multiple delayed copies of the transmitted signal at the receiver. Thermal noise is caused by the random fluctuation on electrons in the receiver hardware, while fading is the result of constructive and destructive interference, as well as absorption during transmission. To protect the source information, error-correction coding (ECC) is performed in the transmitter, after which the coded information is interleaved in order to separate the information to be transmitted temporally. Turbo equalization (TE) is a technique whereby equalization (to correct ISI) and decoding (to correct errors) are iteratively performed by iteratively exchanging extrinsic information formed by optimal posterior probabilistic information produced by each algorithm. The extrinsic information determined from the decoder output is used as prior information by the equalizer, and vice versa, allowing for the bit-error rate (BER) performance to be improved with each iteration. Turbo equalization achieves excellent BER performance, but its computational complexity grows exponentially with an increase in channel memory as well as with encoder memory, and can therefore not be used in dispersive channels where the channel memory is large. A number of low complexity equalizers have consequently been developed to replace the maximum a posteriori probability (MAP) equalizer in order to reduce the complexity. Some of the resulting low complexity turbo equalizers achieve performance comparable to that of a conventional turbo equalizer that uses a MAP equalizer. In other cases the low complexity turbo equalizers perform much worse than the corresponding conventional turbo equalizer (CTE) because of suboptimal equalization and the inability of the low complexity equalizers to utilize the extrinsic information effectively as prior information. In this thesis the author develops two novel iterative low complexity turbo equalizers. The turbo equalization problem is modeled on superstructures, where, in the context of this thesis, a superstructure performs the task of the equalizer and the decoder. The resulting low complexity turbo equalizers process all the available information as a whole, so there is no exchange of extrinsic information between different subunits. The first is modeled on a dynamic Bayesian network (DBN) modeling the Turbo Equalization problem as a quasi-directed acyclic graph, by allowing a dominant connection between the observed variables and their corresponding hidden variables, as well as weak connections between the observed variables and past and future hidden variables. The resulting turbo equalizer is named the dynamic Bayesian network turbo equalizer (DBN-TE). The second low complexity turbo equalizer developed in this thesis is modeled on a Hopfield neural network, and is named the Hopfield neural network turbo equalizer (HNN-TE). The HNN-TE is an amalgamation of the HNN maximum likelihood sequence estimation (MLSE) equalizer, developed previously by this author, and an HNN MLSE decoder derived from a single codeword HNN decoder. Both the low complexity turbo equalizers developed in this thesis are able to jointly and iteratively equalize and decode coded, randomly interleaved information transmitted through highly dispersive multipath channels. The performance of both these low complexity turbo equalizers is comparable to that of the conventional turbo equalizer while their computational complexities are superior for channels with long memory. Their performance is also comparable to that of other low complexity turbo equalizers, but their computational complexities are worse. The computational complexity of both the DBN-TE and the HNN-TE is approximately quadratic at best (and cubic at worst) in the transmitted data block length, exponential in the encoder constraint length and approximately independent of the channel memory length. The approximate quadratic complexity of both the DBN-TE and the HNN-TE is mostly due to interleaver mitigation, requiring matrix multiplication, where the matrices have dimensions equal to the data block length, without which turbo equalization using superstructures is impossible for systems employing random interleavers. / Thesis (PhD)--University of Pretoria, 2013. / gm2013 / Electrical, Electronic and Computer Engineering / unrestricted

ITC/USA 2006 Conference Proceedings / The Forty-Second Annual International Telemetering Conference and Technical Exhibition / October 23-26, 2006 / Town and Country Resort & Convention Center, San Diego, California / Many satellite payloads require wide-band channels for transmission of large amounts of data to users on the ground. These channels typically have substantial distortions, including bandlimiting distortions and high power amplifier (HPA) nonlinearities that cause substantial degradation of bit error rate performance compared to additive white Gaussian noise (AWGN) scenarios. An adaptive equalization algorithm has been selected as the solution to improving bit error rate performance in the presence of these channel distortions. This paper describes the design and implementation of an adaptive baseband equalizer (ABBE) utilizing the latest FPGA technology. Implementation of the design was arrived at by first constructing a high fidelity channel simulation model, which incorporates worst-case signal impairments over the entire data link. All of the modem digital signal processing functions, including multirate carrier and symbol synchronization, are modeled, in addition to the adaptive complex baseband equalizer. Different feedback and feed-forward tap combinations are considered as part of the design optimization.

ITC/USA 2010 Conference Proceedings / The Forty-Sixth Annual International Telemetering Conference and Technical Exhibition / October 25-28, 2010 / Town and Country Resort & Convention Center, San Diego, California / High data rate communication between airborne vehicles and ground stations over the bandwidth constrained Aeronautical Telemetry channel is attributed to the development of bandwidth efficient Advanced Range Telemetry (ARTM) waveforms. This communication takes place over a multipath channel consisting of two components - a line of sight and one or more ground reflected paths which result in frequency selective fading. We concentrate on the ARTM SOQPSKTG transmit waveform suite and decode information bits using the reduced complexity Viterbi algorithm. Two different methodologies are proposed to implement reduced complexity Viterbi decoders in multipath channels. The first method jointly equalizes the channel and decodes the information bits using the reduced complexity Viterbi algorithm while the second method utilizes the minimum mean square error equalizer prior to applying the Viterbi decoder. An extensive numerical study is performed in comparing the performance of the above methodologies. We also demonstrate the performance gain offered by our reduced complexity Viterbi decoders over the existing linear receiver. In the numerical study, both perfect and estimated channel state information are considered.