公开(公告)号：US20030123525A1

公开(公告)日：2003-07-03

申请号：US10315707

申请日：2002-12-09

Applicant: QUALCOMM, Inc.

Inventor： John E. Smee ,  Ahmad Jalali ,  Fuyun Ling ,  Mark Wallace

IPC: H04B001/707

CPC classification number: H04B1/7097 ,  H04L25/03038 ,  H04L2025/03375 ,  H04L2025/03477

Abstract: A receive filter receives signals from a communication channel. The received signals correspond to original Walsh covered chip sequences transmitted by a transmit filter through the communication channel to the receive filter. The received signals are processed by an equalizer to generate a soft estimate of chip sequences corresponding to the original Walsh covered chip sequences. An N chip Walsh decover is then utilized to generate a soft estimate of code symbols corresponding to the soft estimate of the chip sequences. A number of symbol slicers are then used in parallel to produce a hard estimate of the code symbols corresponding to the soft estimate of code symbols generated by the N chip Walsh decover. Thereafter an N chip Walsh cover is used as part of a scheme to generate a hard estimate of chip sequences corresponding to the hard estimate of the code symbols generated by the symbol slicers. The hard estimate of the chip sequences generated with the aid of the N chip Walsh cover, and the soft estimate of the chip sequences generated by the equalizer, are used to generate a tracking mode error signal to adapt the response of the equalizer to the received signals.

Abstract translation: 接收滤波器从通信信道接收信号。 接收到的信号对应于由发射滤波器通过通信信道发射到接收滤波器的原始沃尔什覆盖码片序列。 所接收的信号由均衡器处理以产生对应于原始沃尔什覆盖码片序列的码片序列的软估计。 然后利用N个芯片沃尔什解密来产生对应于芯片序列的软估计的码符号的软估计。 然后，并行地使用多个符号限幅器，以产生对应于由N个芯片沃尔什覆盖生成的码符号的软估计对应的码符号的硬估计。 此后，N芯片沃尔什覆盖被用作方案的一部分，以产生对应于由符号限幅器生成的码符号的硬估计的码片序列的硬估计。 借助于N芯片沃尔什覆盖生成的芯片序列的硬估计和由均衡器产生的芯片序列的软估计被用于产生跟踪模式误差信号，以使均衡器的响应适应于接收到的 信号。