Interdigital Technology Corporation

Tonino Nasuti

Ryan Samuel Buchert

Chayil S Timmerman

John W Haim

Robert A DiFazio

Peter Edward Becker

Stephan Shane Supplee

Method and apparatus for performing midamble cancellation to remove midamble interference from the convolution tail of data fieldand the first W&#x2212;1 chips of the midamble field which results from the delay spread of the multipath channel and for canceling the first W&#x2212;1 chip midamble spread in the data field, which operations are performed substantially simultaneously. The received burst, typically a TDD burst, is stored, the midamble interference and the corresponding parts in the received burst is removed and the resulting burst is applied to a multi-user detector to obtain the symbol sequences.

Method and apparatus for parallel midamble cancellation

Method and apparatus for performing midamble cancellation to remove midamble interference from the convolution tail of data fieldand the first W-1 chips of the midamble field which results from the delay spread of the multipath channel and for canceling the first W-1 chip midamble spread in the data field, which operations are performed substantially simultaneously. The received burst, typically a TDD burst, is stored, the midamble interference and the corresponding parts in the received burst is removed and the resulting burst is applied to a multi-user detector to obtain the symbol sequences.

Method and apparatus for performing midamble cancellation to remove midamble interference from the convolution tail of data field 1 and the first W-1 chips of the midamble field which results from the delay spread of the multipath channel and for canceling the first W-1 chip midamble spread in the data field 2, which operations are performed substantially simultaneously. The received burst, typically a TDD burst, is stored, the midamble interference and the corresponding parts in the received burst is removed and the resulting burst is applied to a multi-user detector to obtain the symbol sequences.

Multi-user detection (MUD) performance is optimized to eliminate redundant use of power during processing. An overbuilt A-matrix, i.e., a system response matrix, is provided. The overbuilt A-matrix uses all possible codes, e.g., all codes identified in a candidate code list (CCL) provided by blind code detection (BCD). The overbuilt A-matrix is passed to the MUD which extracts only those rows or columns required for codes that have actually been received, thus eliminating the need to recompute whitening matched filter (WMF) outputs that do not correspond to the actually received code.

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Norristown, PA, United States of America

Tonino Nasuti