Orthogonal Frequency Division Multiplexing (OFDM) is the integral part of many wireless and telecommunication standards. 4G LTE communication systems extensively use OFDM as their dominant interface. In wireless systems, OFDM splits the signal into channel and reduces crosstalk.
In this thesis, a Space-Frequency (SF) processing is employed with Orthogonal Frequency Division Multiplexing (OFDM) to transform frequency selective fading channels into multiple flat fading sub-channels. Also, Discrete Wavelet Transform (DWT) is used in conjunction with Fast Fourier Transform (FFT) to improve the performance of SF-OFDM.
This thesis passes data through a daubechies2 DWT precoder then divides the input data stream into even and odd inputs and passes it through the SF encoder and applies encoded output to the two transmitter systems. At the receiver end, the system estimates the Bit Error Rate (BER) using a one-receiver system. The BER is estimated using the output obtained at the receiver and then combining the odd and even parts to receive a better BER as compared to the 2x1 (2 transmitters, 1 receiver) SF-OFDM system.
Simulation results show that the BER for a 2x1 SF-OFDM with precoder system are significantly improved over a 2x1 SF-OFDM system with TU channel in a COST207 model.
|Advisor:||Yeh, Hen-Geul (Henry)|
|Commitee:||Kwon, Seok-Chul (Sean), Mozumdar, Mohammad|
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 57/04M(E), Masters Abstracts International|
|Subjects:||Engineering, Electrical engineering|
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