List of Figures 2.1 Discrete-time tapped delay line model for a frequency-selective fading 2.2 Block diagram of a conventional OFDM system. 3.1 Block diagram of a two-branch STBC-OF DM transmitter diversity sys- 3.2 Performance of STBC-OFDM transmitter diversity in a typical urban TU)channel with Ts= 2-sec K= 256, and D= 10Hz. 3.3 Performance comparison of oFDM and STBC-OFDM transmitter di- versity systems at higher fading rates. 3.4 Block diagram of a two-branch SFBC-OFDM transmitter diversity sys- 3.5 Performance of SFBC-OFDM transmitter diversity in a typical urban (TU) channel with Ts=2-sec,K=512, and fD= 10Hz 3.6 Performance comparison of STBC-OFDM and SFBC-OFDM transmit- ter diversity systems 3.7 Performance comparison of STBC-OFDM and SFBC-OFDM transmit- ter diversity systems; fD KTs is doubled for SFBC-OFDM. 3.8 Mean complex channel gain variation between adjacent subcarriers vs block size K for typical urban(tu)and bad urban(BU)channel power delay profiles...·.,..,·
3.9 Performance of SFBC-OFDM transmitter diversity in a bad urban (BU)channel with Ts=2-2sec, K=64, and fD= 10Hz.....44 4.1 Performance of STBC-OFDM without a cyclic prefix in a typical urban (TU)channel with Ts=2-2sec, K= 32, L=5, and D= 10Hz 48 4.2 Performance of SFBC-oFDM without a cyclic prefix in a typical urban (TU)channel with Ts=2-2sec, K= 256, L= 10, and fD= 20Hz. 4.3 Block diagram of the ISFBC-OFDM transmitter diversity system 4.4 Flow diagram of the ISFBC-OFDM transmitter diversity algorithm.. 57 4.5 Performance of ISFBC-OFDM transmitter diversity in a typical urban (TU)channel with Ts=2-sec,K= 256, L= 10, and fD= 20Hz Iteration number is indicated for i =0. 1. and 2 4.6 Performance of ISFBC-OFDM transmitter diversity in a typical ur ban(TU)channel with Ts= 2-sec, K 256, L= 10. i 2, and 4.7 Block diagram of the ISTBC-OFDM transmitter diversity system. 61 4.8 Flow diagram of the ISTBC-OFDM transmitter diversity algorithm. 4.9 Performance of ISTBC-ofDM transmitter diversity in a typical urban (TU)channel with Ts =2-2sec, K= 32, L 5, and fD=10Hz. Iteration number is indicated for i=0, 1, 2, and 3. 4.10 Performance of ISTBC-OFDM transmitter diversity in a typical urban (TU)channel with Ts=2-20sec, K=32, L=5, i=3, and D=200Hz. 67 5.1 Block diagram of a two branch oFDM transmitter diversity system.. 73 ot symbol patterns for an example oFDM transmitter diversity sys- tem with K=8 and M=2. 78
5. 3 Interpolation error as a function of normalized sampling rate 5.4 Block diagram of the proposed PSA channel estimator for a two-branch OFDM transmitter diversity system 5.5 Performance comparison of STBC-OFDM systems with ideal channel parameters and channel parameters estimated by a 3rd order Lagrange nterpolator 5.6 Performance comparison of STBC-OFDM systems with ideal channel parameters and channel parameters estimated by a 3rd order least square interpolator... 5.7 Performance comparison of SFBC-oFDM systems with ideal channel parameters and channel parameters estimated by a 3rd order Lagrange nterpolat 5.8 Performance comparison of SFBC-OFDM systems with ideal channel parameters and channel parameters estimated by a 3rd order least- square interpolator. 5.9 Performance comparison of STBC-OFDM systems with channel pa- rameters estimated by a decision-directed mmse channel estimator and by a psa channel estimator 5.10 Performance comparison of SFBC-OFDM systems with channel pa- rameters estimated by a decision-directed mmSE channel estimator and by a psa channel estimator 5.11 Pilot symbol patterns for an OFDM transmitter diversity system with out a cyclic prefix where K= 8 and M=2
5.12 Block diagram of the proposed PSA channel estimator for a two-branch OFDM transmitter diversity system without a cyclic prefix 5.13 Performance comparison of ISTBC-OFDM systems with ideal channel parameters and channel parameters estimated with a 3rd order least square interpolator. 5.14 Performance comparison of ISFBC-OFDM systems with ideal channel parameters and channel parameters estimated with a 3rd order least square interpolator..····
Glossary AWGN Additive White Gaussian Noise BER Bit error rate CIR Channel Impulse Response DFT Discrete Fourier Transform FFT Fast Fourier Transform IDFT Inverse Discrete Fourier Transform Inverse Fast Fourier Transform ICI Interchannel interference IS Intersymbol interference ISFBC-OFDM- Iterative Space-Frequency block-Coded OFDM ISTBC-OFDM Iterative Space-Time Block-Coded OFDM MRC Maximal ratio Combining MSE Mean-Square Error MMSE Minimum Mean-Square Error MLSE Maximum-Likelihood Sequence Estimation OFDM Orthogonal Frequency Division Multiplexing PSA Pilot-Symbol-Assited SNR Signal-to-Noise Ratio SFBC-OFDM- Space-Frequency Block-Coded OFDM STBC-OFDM Space-Time Block-Coded OFDM