MULTISTAGE LINEAR RECEIVER FOR DS-CDMA SYSTEMS

摘要

A multistage linear receiver for extracting data embedded in a received spread-spectrum signal having a plurality of channels using a direct sequence code division multiple access system. The multistage receiver comprises an initial plurality of spread-spectrum detectors (21), a plurality of detector weighing devices (22), a first plurality of product devices (24), a first combiner (25), a first plurality of spread-spectrum detectors (26), a first plurality of weight-product devices (27) and an output combiner (28). The initial plurality of spread-spectrum detectors (21) despreads and delays the plurality of channels to generate a plurality of detector-output signals. The detector weighing devices weight the plurality of detector-output signals with a plurality of detector weights as a plurality of weighted-detector signals. The plurality of detector-output signals are spread-spectrum processed by the first plurality of product devices to generate a first plurality of spread-spectrum signals which are combined by the first combiner as a first combined signal. The first plurality of spread-spectrum detectors (26) despreads and delays the first combined signal as a first plurality of despread-combined signals which are weighted by the first plurality of weight-product devices to generate a first plurality of weighted signals. The output combiner (28) combines the first plurality of weighted signals and the plurality of weighted-detector signals to extract data. Additional stages comprising product devices, combiners and weight-product devices may be added as necessary or desired.