CDMA spread spectrum mobile phone

Details CDMA spread spectrum mobile phone CDMA spread spectrum mobile phone

1997-09-26

2000-06-06

Ton, Dang

Multiplex communications

Communication over free space

Combining or distributing information via code word channels...

370335, 375200, H04B 1004

Patent

active

060727918

ABSTRACT:
A spread spectrum portable telephone apparatus operates with long wait times and with little battery depletion while waiting. A mobile unit receiver receives and detects radio signals, analog-to-digital (AD) converts the detected reception signals, waveform-shapes the converted signals, despreads and decodes the waveform-shaped signals with a spread signal, frame-resolves the decoded signals, and extracts reception date from the frame-resolved signals. A data receiver is included which has, for both a pager channel and a communications channel, a narrow band AD converter circuit, a narrow band reception filter for waveform-shaping the AD converted signals, and a correlator which despreads and decodes the waveform-shaped signal using a spread code generated by a low speed spread code generator circuit. When waiting, calls to the apparatus are waited for with the power turned on only to the paging channel data receiver.

REFERENCES:
patent: 5414385 (1995-05-01), Worsham, Jr.
patent: 5678227 (1997-10-01), Connell et al.
patent: 5742636 (1998-04-01), Fukushi
patent: 5760699 (1998-06-01), Saka et al.
patent: 5835489 (1998-11-01), Moriya et al.

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