Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1997-07-30
2000-10-17
Chin, Stephen
Pulse or digital communications
Spread spectrum
Direct sequence
375147, 375150, 375267, 701213, H04B 1500
Patent
active
061342629
ABSTRACT:
A receiving apparatus is disclosed which comprises: a receiving circuit for receiving a radio wave signal including a pilot signal and data signal respectively spectrum-spread and converting the received radio wave signal in a base band signal; a Doppler frequency prediction portion for predicting a Doppler frequency due to a fading; a correlation detector including pilot signal PN code generation circuit for detecting a correlation between the pilot signal in the base band signal and a pilot signal PN code from the pilot signal PN code generation circuit every data length of the pilot signal; a correlation length changing portion for outputting a portion of the detected correlation with a length of the portion of the detected correlation varied in accordance with the Doppler frequency from the Doppler frequency prediction portion; and a demodulator for demodulating the base band signal to detect and output the data signal with a distortion of the data signal due to the fading compensated in accordance with the portion of the detected correlation. The length of the portion of the detected correlation is varied by a switch circuit or a weighting circuit.
REFERENCES:
patent: 5544155 (1996-08-01), Lucas et al.
patent: 5559789 (1996-09-01), Nakano et al.
patent: 5796776 (1998-08-01), Lomp et al.
patent: 5859874 (1999-01-01), Wiedeman et al.
Kitade Takashi
Miya Kazuyuki
Chin Stephen
Liu Shuwang
Matsushita Electric - Industrial Co., Ltd.
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