De-spread code phase detection apparatus in spread spectrum type

Details De-spread code phase detection apparatus in spread spectrum type De-spread code phase detection apparatus in spread spectrum type

1995-12-20

1998-09-22

Vo, Don N.

Pulse or digital communications

Repeaters

Testing

370342, 370491, H04J 1302

Patent

active

058125930

ABSTRACT:
A de-spread code phase detection apparatus and method in an SS receiver having a RAKE synthesizing demodulation function of receiving a pilot signal and a data signal, which have undergone spread spectrum modulation, is provided. The apparatus detects a plurality of different de-spread code phases used for demodulation by: performing de-spread processing of the pilot signal, separately performing de-spread demodulation of the data signal by using the plurality of de-spread code phases, performing predetermined weighting processing for the outputs upon phase matching, synthesizing the outputs, and outputting resultant data. The apparatus includes a search correlator, a search processing control section, and a search processing section. The search correlator obtains correlation results of the pilot signal and a de-spread code while sequentially changing the phase of the de-spread code. The search processing control section receives correlation results sequentially output from the search correlator and extracts peak value correlation results. The search processing section detects a plurality of de-spread code phases used for demodulation by obtaining a plurality of correlation results in decreasing order of value from the peak value correlation results extracted by the search processing control section.

REFERENCES:
patent: 5546381 (1996-08-01), Fukushima
patent: 5550811 (1996-08-01), Kaku et al.
patent: 5577022 (1996-11-01), Padovani et al.

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