Digital communication system and method for improving flatness in signal band thereof

A digital communication system and signal technology, applied in the direction of multi-frequency code system, etc.

Active Publication Date: 2010-08-25
COMBA TELECOM SYST CHINA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But for broadband signals, even if the digital signal processing technology can guarantee the signal in-band flatness, for example, a signal with a bandwidth of 5MHz achieves an in-band fluctuation of 0.05dB, but due to the existence of analog devices in the system, the analog devices may have 1dB within the 5MHz bandwidth fluctuations, which in turn causes the entire system to have in-band fluctuations of more than 1dB within the 5MHz bandwidth

Method used

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  • Digital communication system and method for improving flatness in signal band thereof
  • Digital communication system and method for improving flatness in signal band thereof
  • Digital communication system and method for improving flatness in signal band thereof

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Embodiment 1

[0026] This embodiment proposes a digital communication system, as shown in FIG. 2 , including an analog receiving module, a digital down-conversion module, a passband compensation module, a digital up-conversion module and an analog transmitting module. Wherein, the analog receiving module, the digital down-conversion module, the passband compensation module, the digital up-conversion module and the analog transmitting module are connected in sequence.

[0027] The following is a detailed introduction to each module in the system:

[0028] The analog receiving module is used for performing analog filtering and analog down-conversion processing on the radio frequency signal. The analog receiving module generally consists of a receiving antenna, a receiving duplexer, a low-noise amplifier, a down-conversion mixer, and an analog filter connected in sequence. The analog receiving module is mainly used for receiving and processing the input radio frequency signal, including analo...

Embodiment 2

[0044] This embodiment proposes a digital communication system, including an analog receiving module, a digital down-conversion module, a passband compensation module, a digital up-conversion module, and an analog transmission module. Wherein, the analog receiving module, the digital down-conversion module, the passband compensation module, the digital up-conversion module and the analog transmitting module are sequentially connected, and the analog receiving module, the digital down-converting module, the digital up-converting module and the analog transmitting module are the same The corresponding modules are the same. The key point is that the passband compensation module is shown in Figure 3, including a Fourier transform unit for performing fast Fourier transform processing on the signal, a frequency domain filtering unit for performing frequency domain filtering on the signal, and a fast Fourier transform unit for performing fast Fourier transform processing on the signal...

Embodiment 3

[0054] This embodiment proposes a method for improving signal in-band flatness in a digital communication system. Among them, the digital communication system is shown in Figure 2, including an analog receiving module, a digital down-conversion module, a passband compensation module, a digital up-conversion module and an analog transmitter module. Wherein, the analog receiving module, the digital down-conversion module, the passband compensation module, the digital up-conversion module and the analog transmitting module are connected in sequence.

[0055] The analog receiving module is used for performing analog filtering and analog down-conversion processing on the radio frequency signal. The analog receiving module generally consists of a receiving antenna, a receiving duplexer, a low-noise amplifier, a down-conversion mixer, and an analog filter connected in sequence.

[0056] The digital down-conversion module is used for decimating and filtering the digital signal.

[005...

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Abstract

The invention relates to the field of digital signal processing of wireless communication and provides a digital communication system, which comprises an analog receiving module which carries out analog filtering and analog down-conversion processing on radio frequency signals, a digital down-conversion module which carries out decimation filtering processing on digital signals, a pass band compensation module which carries out fluctuating compensation on signals in pass bands, a digital up-conversion module which carries out interpolation filtering and up-conversion frequency mixing processing on the digital signals and an analog launching module which carries out analog filtering and analog up-conversion processing on the radio frequency signals. The invention also provides a method for improving flatness in a signal band in the digital communication system. A frequency domain compensation coefficient is obtained by the digital filtering processing in the frequency domain, namely testing the fluctuation characteristics of the system, and frequency domain filtering processing is carried out on the frequency domain signals according to the frequency domain compensation coefficient, thus realizing fluctuation correction and compensation in the signal band and improving the flatness in each carrier signal pass band in a digital repeater system.

Description

technical field [0001] The invention relates to the field of digital signal processing of wireless communication, in particular to a digital communication system and a method for improving signal band flatness in the digital communication system. Background technique [0002] In the 2G communication era, the bandwidth of a single GSM carrier signal is 200k Hz, which is a narrowband signal. With the introduction of the CDMA standard, the bandwidth of the mobile communication carrier signal has increased dramatically. For example, the useful bandwidth of WCDMA signal reaches 3.84M Hz, while the useful bandwidth of LTE standard signal reaches 5M Hz, 10M Hz or more. Digital processing for broadband signals, such as digital filtering and modulation processing, will be an important topic in the field of mobile communications in the future. With the development of mobile communication, users have higher and higher requirements for mobile communication, which requires improving th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 胡应添
Owner COMBA TELECOM SYST CHINA LTD
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