Orthogonal Frequency Division Multiplexing (OFDM) in Space-Time (ST) coding has been in headlines in the field of communications over the few years due to its flexibility with Multiple Input Multiple Output (MIMO) systems. Orthogonality among carriers is required for OFDM but Carrier Frequency Offset (CFO) at the receiver and change in Doppler shift affect the orthogonality between carriers and lead to Inter Carrier Interference (ICI). Two path transmission schemes are developed for suppressing ICI in MIMO-OFDM systems. Out of many schemes, Parallel Cancellation (PC) and Conjugate Cancellation (CC) are combined with ST-MIMO OFDM to form Space-Time Conjugate and Parallel Cancellation (STCPC) MIMO-OFDM because these schemes provide transmit diversity and coding gain along with ICI mitigation. Simulation results of 4x1 STCPC-MIMO-OFDM with code rate 1 provides excellent Bit Error Rate (BER) compared to conventional 4x1 ST-MIMO-OFDM with different code rates of 0.5 and 1. This scheme also provides better BER performance with lower error floor in fast and slow frequency selective fading channels.
|Advisor:||Yeh, Hen-Geul (Henry)|
|Commitee:||Chassiakos, Anastasios, Mozumdar, Mohammad|
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 56/06M(E), Masters Abstracts International|
|Subjects:||Engineering, Electrical engineering|
|Keywords:||Bit Error Rate, Conjugate Cancellation, Cyclic Prefix, Multiple Input Multiple Output, Orthogonal Frequency Division Multiplexing, Parallel Cancellation|
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