Low complexity MIMO blind adaptive channel shortening

Channel shortening (a generalization of equalization) is often necessary for mitigation of intersymbol and intercarrier interference in multicarrier transceivers. The MERRY (multicarrier equalization by restoration of redundancy) algorithm has previously been shown to shorten a channel blindly and adaptively to the length of the guard interval in a multicarrier system. MERRY is modified to remove the square root and division needed at each iteration, with the added benefit of allowing the use of constraints other than a unit norm equalizer. An extension is proposed which allows for the use of more data in the MERRY update. The algorithm is generalized to the MIMO case. Blind symbol synchronization and initialization techniques are proposed. Simulations demonstrate the success of the algorithm and the synchronization technique in a MIMO setting.