Pulse or digital communications – Repeaters – Testing
Patent
1996-06-04
1998-08-04
Tse, Young T.
Pulse or digital communications
Repeaters
Testing
375206, 375208, 370342, H04B 1707, H04J 1304
Patent
active
057905886
ABSTRACT:
In a system with a spread spectrum transmitter and receiver employing composite spreading codes, the transmitter spreads, in a spreading part, a baseband modulated signal by a short code from a short code generator and a long code from a long code generator with a longer chip period than that of the short code and then transmits the spread baseband modulated signal. The receiver despreads a spread baseband received signal in a receiving part by a pair of short and long codes in one despreading part to obtain a baseband modulated signal of a direct path and despreads the spread baseband received signal by the pair of short and long codes delayed by a multipath delay time difference in the other despreading part to obtain a baseband modulated signal of a delayed path, and the baseband modulated signals thus obtained are diversity-detected to obtain a detected baseband signal.
REFERENCES:
patent: 4969159 (1990-11-01), Belcher et al.
patent: 5420850 (1995-05-01), Umeda et al.
patent: 5465269 (1995-11-01), Schaffner et al.
patent: 5675608 (1997-10-01), Kim et al.
European Search Report.
Fukawa Kazuhiko
Suzuki Hiroshi
NTT Mobile Communications Network Inc.
Tse Young T.
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