Beamforming method with decision feedback frequency domain equalization under multiple antennas

A beamforming method, frequency domain equalization technology, applied in diversity/multi-antenna system, shaping network in transmitter/receiver, baseband system, etc.

Pending Publication Date: 2020-03-17
西安宇飞电子技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0022] Aiming at the deficiencies of the prior art, the present invention discloses a beamforming method with decision feedback frequency domain equalization under multi-antennas, solving the problem of how to perform frequency domain equalization using estimated channel information h after single-carrier channel estimation under multi-antennas , and the multi-antenna beamforming problem

Method used

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  • Beamforming method with decision feedback frequency domain equalization under multiple antennas
  • Beamforming method with decision feedback frequency domain equalization under multiple antennas
  • Beamforming method with decision feedback frequency domain equalization under multiple antennas

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Embodiment 1

[0144] This embodiment provides a multi-antenna beamforming method with decision feedback frequency domain equalization, using this method can well solve the receiver shaping problem, and single carrier frequency domain equalization with decision feedback can Better demodulated signals, and finally, when the maximum ratio of multiple antennas is combined with MRC, the beamforming effect of the receiver can be optimized.

[0145] Single carrier time domain equalization system (SC-TDE) and single carrier frequency domain equalization system (SC-FDE). The single-carrier frequency-domain equalization system combines the advantages of the OFDM system and the single-carrier time-domain equalization system, and is superior to the latter two in terms of complexity and performance.

[0146] In terms of the mechanism of anti-frequency selective fading, OFDM is a parallel transmission at the sending end and parallel processing at the receiving end, which reduces the symbol rate and reduc...

Embodiment 2

[0231] This embodiment discloses frequency domain feedback filtering. After feedforward filtering, it is necessary to feedforward the filtering results for the entire data block. Make a hard decision to get the decision feedback value

[0232] d=[d 0 , d 1 ,...,d L-1 ] T Formula (30)

[0233] in

[0234]

[0235] The process of decision feedback equalization for each data symbol can be written as

[0236]

[0237] in

[0238] p k =[0 1×k ,1,0 1×(L-k-1) ] Formula (33)

[0239] The last term in formula (32) is actually the mean value of the product of the corresponding positions of the vectors C and H.

[0240] Rewrite formula (32) into matrix form as:

[0241]

[0242] Its single-carrier decision feedback frequency domain equalization diagram is as follows image 3 shown.

[0243] channel estimation

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Abstract

The invention relates to the technical field of adaptive antennas, in particular to a beamforming method with decision feedback frequency domain equalization under multiple antennas. The method comprises the following steps of enabling an antenna array system to receive a signal through an antenna and synchronously take out a pilot frequency dw; performing channel estimation calculation on the pilot frequency dw by using an LMS algorithm / eigenvalue decomposition algorithm in combination with channel characteristics; using a single carrier frequency domain equalization system to carry out decision feedback frequency domain equalization processing on the single carrier; and finally, combining the adjusted signals according to the maximum ratio to finish BF forming combination of the receiver. The problems of how to carry out frequency domain equalization by using estimated channel information h after multi-antenna single carrier channel estimation and multi-antenna beam forming are solved. Single-carrier frequency domain equalization with decision feedback can better demodulate signals, finally, when MRC is combined at the maximum ratio of multiple antennas, the beamforming effect ofa receiver can be optimal, and very high creativity is achieved.

Description

technical field [0001] The invention relates to the technical field of adaptive antennas, in particular to a beamforming method with decision feedback frequency domain equalization under multiple antennas. Background technique [0002] At present, the research work of adaptive antenna technology mainly focuses on system theory and engineering implementation, among which the research of system theory mainly refers to adaptive beamforming algorithm; the research of engineering implementation mainly focuses on the hardware implementation of digital beamforming. As far as the algorithm is concerned, a lot of work has been done at home and abroad and great development has been made, but it is still one of the hot research topics in the world. New algorithms and new theories about adaptive beamforming are constantly emerging. [0003] In fact, the combination of traditional antenna beamforming and digital processing technology is what we call digital beamforming technology: the an...

Claims

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Application Information

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IPC IPC(8): H04B7/08H04L25/03H04L25/02
CPCH04B7/0857H04B7/086H04B7/0854H04L25/03159H04L25/025H04L2025/03522H04L2025/03636
Inventor 熊军杨林马杰田进
Owner 西安宇飞电子技术有限公司
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