A Time-Domain Suppression Method of Self-feedback Interference in Same-frequency Full-duplex SISO System
A same-frequency full-duplex, self-feedback technology, applied in baseband system components, transmitter/receiver shaping network, etc., can solve the problem of reducing self-feedback interference cancellation effect and signal quality, NLMS algorithm performance antenna receiving signal The impact of statistical characteristics, self-feedback channel estimation bias, etc.
Inactive Publication Date: 2015-08-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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However, in the research, it is found that the performance of the NLMS algorithm is seriously affected by the statistical characteristics of the antenna received signal
When the signal sample in(n) sequence received by the antenna from the source does not satisfy the statistical characteristics of independent and identical distribution or its mean value E{in(n)}≠0, the NLMS algorithm estimates the self-feedback channel of the same-frequency full-duplex SISO system There will be a large deviation, and w(n) cannot converge to GH LI (n), thereby greatly reducing the cancellation effect and signal quality of self-feedback interference
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[0045] figure 1 It is a typical system structure for self-feedback interference cancellation of the same-frequency full-duplex SISO system. The system structure adopted in this embodiment and figure 1 unanimous. Such as figure 1 Shown, H SR is the channel from the source end to the same-frequency full-duplex SISO system, H LI is the self-feedback interference channel, x[n] is the source signal, the same-frequency full-duplex SISO system receives the received signal from the source as in(n), and the self-feedback signal is y F (n), the sending signal is e(n), and the power amplifier gain is G. Indicates that the signal e(n) is sent in the self-feedback channel for k o sample point delay. In the self-feedback interference cancellation module, w(n) represents the self-feedback channel estimation filter; the self-feedback interference channel estimation module iteratively updates the self-feedback channel estimation filter w(n), and subtracts The estimated interference va...
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The invention discloses a self-feedback interference time domain suppression method in a co-channel full duplex SISO (single input single output) system. A self-feedback channel estimation filter w (n) is iteratively updated, an estimated interference value caused by not independent identically distributed received signal samples is subtracted from an updated quantity of the self-feedback channel estimation filter w (n) in each time of iterative updating, the w (n) can be finally converged to a GHLI (n) in an unbiased manner, a self-feedback interference signal is subtracted in a time domain by the aid of the self-feedback channel estimation filter w (n), finally, transmitted signals are only amplified received signals from a source end to the co-channel full duplex system, and influence on signal quality or self-excitation due to self-feedback interference is basically avoided. Compared with a traditional method, the method can be used for more rapidly and accurately estimating self-feedback interference channels.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, and more specifically relates to a self-feedback interference time-domain suppression method in a same-frequency full-duplex SISO system. Background technique [0002] In the field of wireless communication, the typical same-frequency full-duplex SISO (Simple Input Simple Output, single input single output) system includes a voice power amplifier system and a relay station system in wireless mobile communication. In the same-frequency full-duplex SISO system, the specific frequency band signal received through a single receiving antenna is processed and sent through a single transmitting antenna at the same frequency, which generally plays the role of amplifying the signal relay to increase the signal coverage area. In a full-duplex system, the transmitting antenna and the receiving antenna work at the same frequency at the same time, which will cause the signal sent by the transmi...
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IPC IPC(8): H04L25/02H04L25/03
Inventor 杨吉松孙辰刘皓
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA