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Multi-antenna diversity receiving method and device based on time inversion

A technology of time reversal and diversity reception, applied in the direction of space transmit diversity, diversity/multi-antenna systems, etc., can solve problems such as inability to communicate, increase interference, and reduce useful signal power, so as to simplify the combination technology and enhance the signal-to-noise ratio Effect

Inactive Publication Date: 2012-04-04
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

The fading caused by the multipath effect will reduce the available useful signal power and increase the impact of interference, which will cause distortion, waveform broadening, waveform overlap and distortion of the received signal of the receiver, resulting in a large bit error rate in the demodulator of the communication system. no communication at all

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  • Multi-antenna diversity receiving method and device based on time inversion
  • Multi-antenna diversity receiving method and device based on time inversion
  • Multi-antenna diversity receiving method and device based on time inversion

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Embodiment Construction

[0025] See figure 1 , A multi-antenna diversity receiving method based on time reversal of the present invention includes the following steps:

[0026] (1) For the signal transmitted by the same source, the expression of the radio frequency signal received by the kth antenna in multi-antenna diversity reception is:

[0027] y k ( t ) = s b ( t ) e j 2 π f c t ⊗ h k ( t ) ①

[0028] Where: s b (t) is the transmitted complex baseband information; f c Is the carrier frequency; Represents convolution operation; h k (t) is the impulse response of the multipath fading channel, and its expression is:

[0029] h ( t ) = X i = 0 L a i ( t ) δ ( t - Δτ i ) ②

[0030] In the formula: L is the number of multipath paths, and when i=0, it is the reference path; a i (t) is the complex fading coefficient of the i-th path; Δτ i Is the delay of the i-th path relative to the...

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Abstract

The invention discloses a multi-antenna diversity receiving method and device based on time inversion. The method comprises the following steps of: firstly, carrying out down-conversion treatment on radio frequency signals received by antennas respectively to obtain multiple unrelated compound baseband signals; next, carrying out channel evaluation respectively according to the obtained compound baseband signals to obtain independent transmission channel parameters of receiving antennas; then, working out time inversion conjugate formulae of channels according to the evaluated channel parameters; and then, carrying out convolution operation on the compound baseband signals received by the antennas and the time inversion conjugate formulae of corresponding transmission channels respectively; finally, processing the convolution result by an equal gain combination method to obtain a final multi-antenna diversity result. According to the method and device disclosed by the invention, the signal-to-noise ratio of the received signal can be increased, combination and balance strategies are simplified, and the performance of the wireless communication system is improved.

Description

Technical field [0001] The present invention belongs to the field of wireless communication technology, and particularly relates to a multi-antenna diversity receiving method and device based on time reversal. Background technique [0002] Wireless communication systems often work in complex geographic environments. The emitted electromagnetic wave signals reach the receiving antenna after being reflected, scattered, and diffracted through multiple different propagation paths. The signal components of different paths have different propagation delays, phases and amplitudes, and are added with channel noise. Their superposition will make the composite signals cancel or enhance each other, forming a multipath effect. Among them, the signals of different phases and amplitudes are superimposed on each other, and the amplitude of the synthesized signal shows rapid fluctuations, forming fast fading. For a digital wireless communication system, when the propagation delay is equivalent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/08
Inventor 谢跃雷欧阳缮蒋留兵丁勇徐婷
Owner GUILIN UNIV OF ELECTRONIC TECH
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