Wireless repeater with decision feedback equalizer based on LDPC code

Abstract

In this paper, we propose a wireless repeater with DFE (decision feedback equalizer) based on LDPC (Low Density Parity Check) codes. So as to meet ever increasing requirements on higher wireless access data rate and better quality of service (QoS), the wireless repeater system studied. In the wireless repeater, the feedback channel and RF impairments such as phase noise, carrier frequency offset, and more has caused performance degradation. In order to remove feedback channel and phase noise, we suggest a novel equalizer for wireless repeater. LDPC codes are well known as forward error correction codes which are very good performance. LDPC codes have a good performance in error correction along with Turbo codes. The proposed equalizer helps to compensate RF impairments and improve better performance than used independently. In addition, proposed equalizer has less iterative number of LDPC codes. So, the proposed equalizer system has low complexity. Therefore, we propose system model of proposed equalizer for wireless repeater and evaluate BER performance in feedback channel and phase noise based on OFDM system by using MATLAB Simulink.