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Method for estimating and correcting delay inequality between reception channels of broadband multi-antenna communication system

A technology for receiving channels and communication systems, which is applied in the field of time delay difference estimation and correction between receiving channels of a broadband multi-antenna communication system, can solve the problem that complex coefficient multipliers cannot achieve channel correction, and cannot ensure consistent group delay and inconsistent delay. And other issues

Active Publication Date: 2015-04-08
XI AN JIAOTONG UNIV
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Problems solved by technology

At this time, channel correction cannot be achieved with only a complex coefficient multiplier
[0004] Through a series of analog correction methods, the channel can have relatively stable group delay characteristics within the bandwidth range, but it cannot guarantee that the group delay of each channel is consistent, that is to say, the phase inconsistency performance of each channel related to frequency at this time inconsistency

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  • Method for estimating and correcting delay inequality between reception channels of broadband multi-antenna communication system
  • Method for estimating and correcting delay inequality between reception channels of broadband multi-antenna communication system
  • Method for estimating and correcting delay inequality between reception channels of broadband multi-antenna communication system

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Embodiment Construction

[0036] The multi-antenna receiver involved in the present invention is such as figure 1 As shown, there are a total of N receiving channels, and the structure of each receiving channel is as follows figure 2 shown. Affected by the analog signal processing part, there is inconsistency in each channel, which is manifested as inconsistency in transmission delay and inconsistency in amplitude and phase independent of frequency. The receiver is equipped with a calibration signal source, which can generate a single-frequency calibration signal of a specified frequency, and the signal is simultaneously input to each receiving channel through a power divider and a coupler. The correction module in the digital processing part of each receiving channel completes the detection of the calibration signal and the correction of the delay difference.

[0037] A method for estimating the time delay difference between receiving channels of a broadband multi-antenna communication system of th...

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Abstract

The invention discloses a method for estimating and correcting delay inequality between reception channels of a broadband multi-antenna communication system. The method comprises the following steps of estimating the delay inequality between the reception channels through testing and calibration signals; compensating delay inequality of integer sampling periods by designing a delaying module; and compensating delay inequality of time shorter than a sampling period by using an FIR (finite impulse response) filter to realize delay alignment of the channels. The order of the FIR filter is low, the number of occupied resources is small, and the design complexity is low. By the method, arraying channels of broadband signals can be corrected effectively.

Description

【Technical field】 [0001] The invention relates to the technical field of wireless communication, in particular to a time delay difference estimation and correction method between receiving channels of a broadband multi-antenna communication system. 【Background technique】 [0002] In a multi-antenna communication system, digital beamforming technology can enhance the signal in a specific direction, thereby improving the effectiveness and reliability of communication. Compared with analog beamforming technology, it has extremely high flexibility. It is easy to adjust the beam direction and can form multiple beams with different directions at the same time. Direction of Arrival (DOA) estimation technology, which is closely related to digital beamforming technology, can realize ultra-high resolution direction finding, and plays an important role especially in military communication systems. An important prerequisite for applying these digital signal processing technologies in p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/309
Inventor 穆鹏程杨培志王勃殷勤业王文杰王慧明
Owner XI AN JIAOTONG UNIV
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