Improvement measures of DHT precoded OFDM over WiMAX channels with piecewise linear companding

Orthogonal frequency division multiplexing (OFDM) is multicarrier wireless communication modulation scheme, which is a fascinating approach for wireless communication applications to achieve very high data rates. However, its key limitation is its large peak to average power ratio (PAPR), which results in significant distortion while passing through a nonlinear device, such as a transmitter high power amplifier (HPA). Many techniques are proposed to reduce PAPR, but those are reducing the PAPR at cost of increasing the bit error rate (BER). In this paper a combination of Piecewise linear companding with Discrete Hartley Transform (DHT) is proposed to reduce the PAPR to great extent. Simulation results shows that this proposed method obtains effective reduction of PAPR while maintaining improved performance in the Bit Error Rate (BER) without performance degradation of Power Spectral Density (PSD).