A DECISION FEEDBACK EQUALIZER DESIGN WITH SUCCESSIVE SIGNAL DETECTION
Keywords:
Multi Path Component (MPC), Inter Symbol Interference (ISI), Decision Feedback Equalizer, Successive Signal detection, Bit Error Rate (BER), Probability of Error (Pe)Abstract
A unique approach has been presented in this paper combining the decision feedback mechanism and successive signal detection to equalize frequency selective channel effects for signals traversing different run-lengths. In this approach, the errors on comparison between the transmitted signal and received signal are fed to the equalizer to adjust the tap weights. Yet the irreversible nature of inter symbol interference proves to be a big challenge due to multi path propagation techniques in wireless channels. It is observed commonly that signals traversing a comparatively smaller path reach the receiver earlier and quicker compared to the multi-path component traversing a longer path. Assuming similar shadowing effects, it is observed that fading effects make it hard to receive long distance MPC in an accurate manner, thereby degrading the BER performance. It has been clearly shown that the proposed system achieves almost similar BER performance irrespective of the shadowing effect or run length of the MPCs.
