Transmitting/receiving facility and method for transmitting broadband signals as well as transmitting/receiving facility for receiving broadband signals

US6310706A · kind A · utility

Assignee

• ALCATEL · FR

Inventors

• Rolf Heidemann · Zöblitz, DE
• Heinz Krimmel · Ditzingen, DE

Key dates

• Filing date: Jun 3, 1999
• Grant date: Oct 30, 2001
• Expiry date: Jun 3, 2019

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N21/6168
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

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 tranmitting/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.