Patent ID: 7773704

Claim:
Apparatus for estimating symbol sequences in a received burst, comprised of a first data field, a midamble and a second data field, the apparatus for canceling an effect of midamble interference from corresponding parts of the received burst, comprising: a buffer for receiving and storing the received burst; a channel estimator for determining a channel estimation from a midamble portion of the received burst; a detector utilizing the channel estimation from the channel estimator for obtaining channel responses and midamble shift numbers; a midamble cancellation circuit utilizing the channel responses, midamble shift numbers and the received burst for canceling the effect of midamble interference on the first and second data fields of the received burst to obtain a burst having the midamble cancelled; a code decision circuit for obtaining channelization codes and midamble shifts from said midamble shift numbers and the cancelled midamble burst; and a multi-user detector (MUD) for estimating symbol sequences from said midamble cancelled burst and said channelization codes.