Transmitting/receiving facility and method for transmitting broa

Details Transmitting/receiving facility and method for transmitting broa Transmitting/receiving facility and method for transmitting broa

1997-11-26

2000-02-15

Pham, Chi H.

Pulse or digital communications

Repeaters

Testing

H04B 1500, H04K 100, H04L 2730

Patent

active

060261161

ABSTRACT:
Stationary interference signals from radio stations, for example, enter a transmission network (NET), e.g., a coaxial cable network with return channel, and impair the transmission of broadband signals, e.g., data, in the upstream frequency band, since they lie in the same frequency range. The transmitting/receiving unit (SE1) of a terminal (END) contains a receiving unit (EMP1) for receiving frequency values of stationary interference signals induced in the transmission link, a memory (MEMO1) for storing the received frequency values, a generator (SG1, NG1) for generating a spreading function with spectral zeros at frequency values which are determined from the stored frequency values, and a multiplier (MUL1) for multiplying the broadband signals to be transmitted by the generated spreading function with spectral zeros. The spectral zeros are so generated that, if the spreading function with the spectral zeros is multiplied by the interference signals, at least one of the spectral zeros is located in the frequency range of the broadband signals, so that when the broadband signals are despread at a center (ZE), the impairment caused by the interference signals is reduced.

REFERENCES:
patent: 4455651 (1984-06-01), Baran
patent: 4912721 (1990-03-01), Pidgeon, Jr. et al.
patent: 5239556 (1993-08-01), Ishigaki et al.
patent: 5748677 (1998-05-01), Kumar
patent: 5903551 (1999-05-01), Kingston et al.

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