公开(公告)号：GB2381715A

公开(公告)日：2003-05-07

申请号：GB0217441

申请日：2002-07-29

Applicant: MOTOROLA INC

Inventor： FRANK COLIN D ,  VISOTSKY EUGENE ,  CHOUDHARY PRASHANT ,  GHOSH AMITAVA

IPC: H04B1/7105 ,  H04B1/7107 ,  H04L25/03 ,  H04B1/707

Abstract: The present invention provides linear MMSE equalization with parallel interference cancellation for symbol determination in a forward link of a CDMA communication system which has a plurality of code channels in use. Use of the linear MMSE equalization with parallel interference cancellation of the present invention provides significantly increased performance. The preferred method linearly filters a received signal to form a first filtered signal (410), despreads and demodulates the first filtered signal (415, 420) and provides a plurality of symbol estimates for all corresponding code channels (430). An estimated transmitted signal is generated from the plurality of symbol estimates (435), and with a channel estimate (405), an estimated received signal is generated (440). A residual signal is determined as a difference between the received signal and the estimated received signal, is linearly filtered (445), and then combined with the estimated transmitted signal to form a next, enhanced estimated transmitted signal (450 Figure 4B). This next estimated transmitted signal is despread (455, 460 Figure 4B) and utilized to provide a next plurality of symbol estimates, for a selected code channel of the plurality of channels, for subsequent use in error correction and decoding, and further use by a subscriber (465, 475 Figure 4B).

公开(公告)号：GB2381715B

公开(公告)日：2004-10-20

申请号：GB0217441

申请日：2002-07-29

Applicant: MOTOROLA INC

Inventor： FRANK COLIN D ,  VISOTSKY EUGENE ,  CHOUDHARY PRASHANT ,  GHOSH AMITAVA

IPC: H04B1/7105 ,  H04B1/7107 ,  H04L25/03 ,  H04B1/707

Abstract: The present invention provides linear MMSE equalization with parallel interference cancellation for symbol determination in a forward link of a CDMA communication system which has a plurality of code channels in use. Use of the linear MMSE equalization with parallel interference cancellation of the present invention provides significantly increased performance. The preferred method linearly filters a received signal to form a first filtered signal ( 410 ), despreads and demodulates the first filtered signal ( 415, 420 ) and provides a plurality of symbol estimates for all corresponding code channels ( 430 ). An estimated transmitted signal is generated from the plurality of symbol estimates ( 435 ), and with a channel estimate ( 405 ), an estimated received signal is generated ( 440 ). A residual signal is determined as a difference between the received signal and the estimated received signal, is linearly filtered ( 445 ), and then combined with the estimated transmitted signal to form a next, enhanced estimated transmitted signal ( 450 ). This next estimated transmitted signal is despread ( 455, 460 ) and utilized to provide a next plurality of symbol estimates, for a selected code channel of the plurality of channels, for subsequent use in error correction and decoding, and further use by a subscriber ( 465, 475 ).