Efficient blind equalization for OFDM systems by RLS-based MERRY algorithm

In multicarrier systems such as orthogonal frequency division multiplexing (OFDM), communication quality deteriorates by interblock interference if channel impulse response is longer than cyclic prefix length. It is well-known that channel shortening method that uses time-domain equalizer (TEQ) is effective for that case, and there have been already some algorithms like multicarrier equalization by restoration of redundancy (MERRY), RLS-MERRY, and multistage MERRY. In this paper, we propose an improved channel-shortening method for TEQ which can be regarded as a combination of RLS adaptive filtering and multistage MERRY.