Patent ID: 7848288

Claim:
A wireless transmit/receive unit (WTRU) comprising: a receiver configured to receive a communication burst transmitted using an actual channelization code for the WTRU and at least one other actual channelization code for other WTRUs, the WTRU not knowing the actual channelization code and the at least one other actual channelization code; a midamble detector configured to: (1) detect a midamble in the received communication burst, the midamble having one of a plurality of midamble schemes, and (2) determine the one of the plurality of midamble schemes; a candidate code list generator configured to generate, as a function of the determined one of the plurality of midamble schemes, a list of channelization codes that could be at least one of the actual channelization code and the at least one other actual channelization code; and a code detector configured to (1) identify active channelization codes for the WTRU and for the other WTRUs included in the list of channelization codes and (2) forward the identified active channelization codes to a multi-user detector (MUD), the MUD being configured to use the identified active channelization codes to recover data from the communication burst.