POINT-TO-MULTIPOINT COMMUNICATION SYSTEM WITH PRE-DISTORSION AND DECISION FEEDBACK EQUALIZER TO REDUCE INTERPACKET INTERFERENCES

摘要

A packet based point to multipoint wireless transmission system comprises an access point (AP, 100) communicating with a plurality of subscriber units (Sus, 101). At each SU each packet to be transmitted is linearly pre-distorted (116) to remove pre-cursors. A non-linear decision feedback equaliser (131) including a transversal feedback filter is provided at the (AP) to reduce inter-symbol interferences. The feedback filter is arranged to hold symbol decisions made for all packets received during a given period prior to the packet being currently received to enable inter-packet interference to be reduced in the same manner as inter-symbol interference. The given period is arranged to extend for a period to accommodate the largest channel excess delay spread.