Spread spectrum communication apparatus and telephone exchange s

Details Spread spectrum communication apparatus and telephone exchange s Spread spectrum communication apparatus and telephone exchange s

1994-06-13

1995-11-14

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

375200, 375205, 370 18, 380 34, 379219, 379220, 379258, 379268, H04B 1707

Patent

active

054673674

ABSTRACT:
A telephone exchange system of this invention has a terminal connected to an extension by radio. As a radio communication modulation method, a spread spectrum method is used. A speech signal received from a line by the telephone exchange system is exchanged by an exchange switch, and is supplied to a data conversion unit. The data conversion unit causes a serial/parallel converter to covert a serial input signal into a parallel signal. The converted parallel signal is subjected to spread-spectrum modulation in units of parallel bits. The modulated signal bits are added to each other by an adder, and the sum signal is multiplexed on a carrier signal. The multiplexed signal is transmitted to the terminal. Upon reception of the signal, the terminal causes a phase synchronization circuit to generate an inverse spread code corresponding to a spread code, and synchronized with the reception signal, and inversely spreads the reception signal using the generated inverse spread code. The inversely spread signal is converted into a serial signal by a parallel/serial converter, i.e., is demodulated into a speech signal. When a signal is transmitted from the terminal, the said procedure as described above is executed in the opposite direction.

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patent: 4759034 (1988-07-01), Nagazumi
patent: 4969159 (1990-11-01), Belcher et al.
patent: 5204877 (1993-04-01), Endo et al.

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