In the 21st century the role of wireless communications has increased tremendously, especially mobile communication and high speed internet usage. Orthogonal Frequency Division Multiplexing (OFDM) communication technique has far more advantages over traditional communication techniques in terms of data rate, spectral efficiency and low fading. However, it still has a few drawbacks like Peak to Average Power Ratio (PAPR) which causes distortion at the transmitter part of the OFDM. The weighted OFDM approach has been proposed to reduce the PAPR without distortion and successfully remove the respective weight at the receiver end.
The proposed method mainly intends to impose some weight on each discrete OFDM signal with certain amount of band limited signal and finally a weighted discrete OFDM signal is formed before it is given to High Power Amplifier (HPA). At the receiver end the same original signal should be received completely but the only condition in this approach is that the time taken at both transmitter and receiver end should be the same.
Finally the efficiency and the performance of the proposed weighted scheme are evaluated by the simulation results. The numerical analysis acquired from the proposed weighted scheme reveals that the PAPR of weighted technique is lesser than the conventional clipping and filtering (CF) method and the Bit Error Rate (BER) performance also improved a lot when compared to the CF method.
|Commitee:||Ary, James, Shahian, Bahram|
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 55/02M(E), Masters Abstracts International|
|Keywords:||Orthogonal frequency division multiplexing, Peak to average power ratio|
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