EQUALIZER FOR COMMUNICATION OVER NOISY CHANNELS

摘要

An apparatus for and a method of iterative equalization for communication over noisy channels suitable for use with a wide range of different types of communications systems and channels and is particularly applicable to power line based communication systems. The equalization of the received symbol is achieved by iteratively removing the influence of previous symbols dispersed due to channel ISI (34). Equalization is performed using iterative subtraction in combination with calculations based on the inverse of the transfer matrix. The impulse function of previous symbols is subtracted out to yield the impulse response of the received symbol (30). The estimate of the current symbol Betan is then calculated by passing the modified received symbol through a matched filter which functions to remove the effect of channel ISI from the symbol (36). Multiple iterations are performed to improve the accuracy of the resultant symbol decision (40).