Rake receiving apparatus for direct sequence code division multi

Details Rake receiving apparatus for direct sequence code division multi Rake receiving apparatus for direct sequence code division multi

1997-04-04

1999-09-21

Chan, Jason

Pulse or digital communications

Repeaters

Testing

370335, 370342, H04B 1500, H04K 100, H04L 2730

Patent

active

059563672

ABSTRACT:
A rake receiving apparatus used in communication systems using a DS/CDMA (direct sequence code division multiple access) system, wherein a single demodulating finger is used for a plurality of multipath signals, thereby being capable of not only greatly reducing the complexity of its demodulators, but also achieving an improvement in performance where a large number of multipaths are used. The apparatus includes a searcher for extracting the phases of pseudo noise codes searcher for pseudo corresponding in number to existing multipaths, a combiner controlling unit for selecting those of the phase values from the searcher to be combined together, a combiner for combing selected phase values together, a pseudo noise code generator for generating pseudo noise codes, a demodulator for reversely sequencing its input signal using the output from the pseudo noise code generator, thereby recovering data, and a synchronization tracer for controlling the pseudo noise code generator such that the pseudo noise code phase of the pseudo noise code generator coincides with the pseudo noise code phase of the input signal at the synchronization tracer.

REFERENCES:
patent: 4984247 (1991-01-01), Kaufmann et al.
patent: 5671221 (1997-09-01), Yang

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