Packet data transmission in worldwide interoperability for microwave access with reduced peak to average power ratio and out-band distortion using software defined radio

The high peaks of a conventional orthogonal frequency division multiplexing (OFDM) symbol may push the amplifier into the non-linear region, which creates many problems that reduce performance and lead to out of band distortion. In this study, the authors present and analyse four different peak to average power ratio (PAPR) reduction techniques such as phase modulation, rail clipping, sample and hold approach and threshold method for packet data transmission of OFDM on mobile-worldwide interoperability for microwave access system. The performance of each PAPR reduction technique on OFDM system is presented in time and frequency domains separately. Therefore an existing OFDM system can provide an additional CE-OFDM mode with relative ease, particularly for the case of software defined platforms. Nowadays, the behaviour of a communication system has been modified by simply changing its software. This gave rise to a new radio model called software defined radio, in which all hardware components are implemented in software rather than in hardware. For our investigation, GNU radio and universal software radio peripheral N210 are employed as software and hardware platforms, respectively. It is shown that for a high clipping threshold value, the gap between in-band and out-of-band radiations is maintained well.

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