Spread spectrum method for transmitting an information signal as

Details Spread spectrum method for transmitting an information signal as Spread spectrum method for transmitting an information signal as

1994-10-19

1997-04-29

Bocure, Tesfaldet

Pulse or digital communications

Repeaters

Testing

375206, H04H 100

Patent

active

056256396

ABSTRACT:
In a spread spectrum device including a serial to parallel converter (14) for converting a serial information signal (10) into a parallel signal of n bits, where n represents an integer not smaller than two, an information modulator (20) carries out information modulation on m bits among the n bits of the parallel signal and produces a modulated information signal, where m represents a positive integer smaller than n. A selective spreading code producing circuit (21, 22) has spectrum spreading codes which are equal in number to 2.sup.(n-m) and are different from one another. The selective spreading code producing circuit selectively produces, as a selected spreading code, one of the spectrum spreading codes that is specified by remaining (n-m) bits among the n bits of the parallel signal. A spectrum spreading circuit (23) carries out spectrum spreading on the modulated information signal on the basis of the selected spreading code and produces a spectrum spread signal (13). The spectrum spread signal may be transmitted by a radio portion (18) as a radio information signal (11).

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patent: 5420850 (1995-05-01), Umeda et al.
patent: 5461639 (1995-10-01), Wheatley, III et al.

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