Blind Adaptive Channel Equalizer of Multi-Path Feedback Channel for OFDM-Based Wireless Repeater System

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In this paper, we aim to blindly equalize the received multipath channel in relay system and then eliminate the interferences that occurred in relay system by adaptive filter Blind equalizers do not require any known training sequence for the startup period, but can rather perform at any time equalize directly on the data stream Moreover, the pilot signal can be cut off due to utilization of Blind Equalizer so that the amount of transmitted data is reduced Thus faster computational process is expected In this paper, relay system's transceiver frequency is employed in same frequency so that the amplified signal may interfere the relay system itself Moreover if there is any multipath channel it will make the interference signal more sophisticated while amplified signal is fed back to the receiver side In order to cancel out these interferences, we have to realize a replica of feedback multipath channel By adaptive filter we have to realize the replica of multipath channel in relay system In this research Constant Modulus Equalizer (CME) and Modified Constant Modulus Equalizer (MCME) in time domain process is used to modify the received signal and adaptive filter Normalized Least Mean Square is implemented inside system in order to eliminate the interference that comes from the transmitter side of itself On the other hand our system is hybrid system of CMA and NLMS In order to evaluate the CMA and MCMA, we have analyzed with the Normalized Mean Square Error (NMSE) Consequently Modified Constant Modulus Equalizer enhances the performance.
2013-02-14

Blind Adaptive Channel Equalizer of Multi-Path Feedback Channel for OFDM-Based Wireless Repeater System

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