Transmitting/receiving facility and method for transmitting broadband signals as well as transmitting/receiving facility for receiving broadband signals
First Claim
1. A transmitting/receiving facility (SE1) for transmitting broadband signals using spread-spectrum techniques, comprising:
- a receiving unit (EMP1) for receiving frequency values of stationary interference signals which are 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
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Accused Products
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 individual 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.
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Citations
12 Claims
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1. A transmitting/receiving facility (SE1) for transmitting broadband signals using spread-spectrum techniques, comprising:
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a receiving unit (EMP1) for receiving frequency values of stationary interference signals which are 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 - View Dependent Claims (2)
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3. A transmitting/receiving facility (SE2) for receiving broadband signals modulated using spread-spectrum techniques, comprising:
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a detection unit (DET2) for detecting frequency values of stationary interference signals;
a transmitting unit (SEN2) for transmitting the detected frequency values;
a memory (MEMO2) for storing the detected frequency values;
a generator (SG2, NG2) for generating a spreading function with spectral zeros at frequency values which are determined from the stored frequency values; and
a multiplier (MUL2) for multiplying the received broadband signals by the generated spreading function with spectral zeros. - View Dependent Claims (4, 5, 6)
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7. A method of transmitting broadband signals from a first transmitting/receiving facility (SE1) to a second transmitting/receiving facility (SE2), comprising the steps of:
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detecting stationary interference signals at the second transmitting/receiving facility (SE2) and transmitting them to the first transmitting/receiving facility (SE1);
generating in the first transmitting/receiving facility (SE1) a spreading function with spectral zeros depending on the frequency values to be transmitted; and
multiplying the broadband signals to be transmitted by the spreading function with spectral zeros and transmitting the resulting signal to the second transmitting/receiving facility (SE2). - View Dependent Claims (8, 9)
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10. A transmitting/receiving facility (SE3) for optically transmitting broadband signals using spread-spectrum techniques, comprising:
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a receiving unit (EMP3) for receiving frequency values of stationary interference signals occurring on an optical link;
a memory (MEMO3) for storing the received frequency values;
a broadband optical source (CW);
an electrooptic modulator (MOD) for modulating the optical output signals from the broadband optical source (CW) with the broadband signals to be transmitted; and
an optical filter (FIL) with variable stop frequencies which are varied, at least in part, as a function of the stored frequency values. - View Dependent Claims (11)
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12. A transmitting/receiving facility (SE4) for receiving broadband signals modulated using spread-spectrum techniques, comprising:
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a detection unit (DET4) for detecting frequency values of stationary interference signals;
a transmitting unit (SEN4) for transmitting the detected frequency values;
a memory (MEMO4) for storing the detected frequency values;
at least one optical filter (FIL1 to FILn) with variable stop frequencies which are varied, at least in part, as a function of the stored frequency values; and
at least one optical-to-electrical transducer (OE1 to OEn) following the at least one optical filter (FIL1 to FILn) and serving to convert the signals passed by the at least one optical filter (FIL1 to FILn) from optical to electrical form.
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Specification