DIGITAL COMMUNICATION SYSTEMS HAVING DECREASED MEMORY

摘要

Apparatus and method that recovers complex symbols transmitted through a propagation channel as modulated symbols impressed on a carrier signal and distinguished by respective channelization codes, comprising: a path estimator (504) that selects at least one multi-path delay for received complex symbols; a rake process or (502) that multiplies chips in a chip sequence with at least a corresponding channelization code based on at least one multi-path delay selected by the path estimator and generates a set of symbols corresponding to the channelization codes and multi-path delays; a channel estimator (508) that generates estimates of an impulse response of the propagation channel for the corresponding multi-path delay; a combiner (506) that multiplies symbols for a multi-path delay with complex conjugates of corresponding impulse response estimates generated by the channel estimator and reproduces the modulated symbols that were transmitted.