Performance Of Multiuser STBC /SFBC

High rate space-time block codes (STBC) can achieve sufficient diversity gains and high ratedata transmission over multiple-input multiple-output (MIMO) flat fading channels. High ratespace-frequency block codes (SFBC) are designed by combining the high rate STBC withorthogonal frequency division multiplexing (OFDM) over MIMO frequency selective fadingchannels. This thesis investigates the performance of high rate STBC or SFBC over correlatedNakagami fading channels.In multiuser system, multiple users share their limited frequency resources in order to improvethe utilization of spectrum resources. When single user STBC or SFBC is applied to multiusersystem simply, the transmission rate will be reduced or the error performance will be suboptimum.Therefore, multiuser STBC or SFBC is proposed. The performance of multiuser STBC/SFBC hasreceived wide attention over Rayleigh fading channels. This thesis investigates the performance ofmultiuser STBC/SFBC over Nakagami fading channels.Chapter 1 presents a brief review of high rate STBC, high rate SFBC and multiuserSTBC/SFBC.Chapter 2 investigates the average bit error rate (BER) performance and the effectivethroughput performance of the high rate full diversity STBC based on Alamouti code and the highrate full diversity STBC based on coordinate interleaved orthogonal design (CIOD) code withquaternary phase shift keying (QPSK) and binary phase shift keying (BPSK) modulation for twotransmitting antennas over correlated Nakagami fading channels, respectively. The simulationresults show that the increasing of the Nakagami fading factor and the correlation between theantennas improves and deteriorates the average BER and the effective throughput performance fortwo kinds of high rate STBCs, respectively.Chapter 3 investigates the average BER performance of the full rate full diversitysingle-symbol maximum likelihood decoding SFBC and the high rate full diversity SFBC withcoordinate interleaved precoding with QPSK/BPSK modulation for two transmitting antennas overtwo ray frequency selective correlated Nakagami fading channels, respectively. The simulationresults show that the high rate SFBC not only has higher coding rate, but also has a good averageBER performance when compared to the full rate SFBC; the Nakagami fading factor and thecorrelation between the antennas affect the average BER performance for the full rate SFBC and thehigh rate SFBC.Chapter 4 investigates the sorted complex sphere decoding algorithm of multiuser STBC/SFBC over Nakagami fading channels. The error performance for two users STBC systemwith more than or equal one user having decoding error and the error performance for two usersSFBC system with both users having decoding error are simulated. The simulation results show thatNakagami fading factor seriously affects the error performance of multiuser STBC/SFBC.Chapter 5 is the conclusion of this thesis.