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Bidirectional Turbo Equalization Method Based on Direct Adaptation in Multiple-Input and Multiple-Output Systems

A multi-input multi-output, equalization method technology, applied in the direction of diversity/multi-antenna system, transmission system, radio transmission system, etc., to achieve the effect of improving algorithm efficiency, reducing bit error rate, detection accuracy and algorithm efficiency

Active Publication Date: 2019-12-24
浙江望海潮科技有限公司
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Problems solved by technology

[0009] The purpose of the present invention is to overcome the defects of the equalization method in the existing MIMO system, thereby providing a method with high detection accuracy and high stability

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  • Bidirectional Turbo Equalization Method Based on Direct Adaptation in Multiple-Input and Multiple-Output Systems
  • Bidirectional Turbo Equalization Method Based on Direct Adaptation in Multiple-Input and Multiple-Output Systems
  • Bidirectional Turbo Equalization Method Based on Direct Adaptation in Multiple-Input and Multiple-Output Systems

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Embodiment Construction

[0036] The present invention will be further described now in conjunction with accompanying drawing.

[0037] Problem Description

[0038]In a MIMO system, assuming that the number of transmitting array elements is N and the number of receiving array elements is M, the underwater acoustic channel is modeled as a finite channel impulse response, and the noise is additive white Gaussian noise (AWGN). Received signal r of m array elements m,k for:

[0039]

[0040] Among them, s n,k is the transmitted signal of the nth array element at the kth moment, h n,m,l-k is the channel impulse response between the nth transmitting element and the mth receiving element at time l-k, v m,k is the Gaussian white noise superimposed on the mth receiving array element at the kth moment.

[0041] It can be seen from formula (1) that in a MIMO system, if you want to distinguish each transmitted signal from the received signal, in addition to eliminating inter-symbol interference (the second...

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Abstract

The invention relates to a bidirectional turbo equalization method based on direct adaption in a multi-input multi-output (MIMO) system. The method is applied to a bidirectional soft decision feedback equalizer. The bidirectional soft decision feedback equalizer comprises a conventional soft decision feedback equalizer, and a soft decision feedback equalizer with time reversal. The soft decision feedback equalizer with time reversal is formed by respectively connecting two components capable of realizing time reversal to the input end and the output end of a conventional soft decision feedback equalizer. The method comprises the steps of carrying out bidirectional turbo equalization with a received signal and a feedback signal of the received signal in a bidirectional soft decision feedback equalizer, and linearly adding the result of forward turbo equalization and the result of backward turbo equalization together to realize signal estimation. The method of the invention has the advantages of strong stability, high detection accuracy, fast convergence and low complexity, and has certain practical value and application prospect in an actual underwater acoustic communication system.

Description

technical field [0001] The invention relates to the field of underwater acoustic communication, in particular to a two-way turbo equalization method based on direct self-adaptation in a multiple-input multiple-output system. Background technique [0002] Due to the limited bandwidth of the underwater acoustic channel, the single-input single-output (SISO, simple input simple output) system is difficult to meet the actual communication needs, and now more research is on the multiple-input multiple-output (MIMO, Multiple-Input Multiple-Output) system. In the MIMO system, the transmitting end adopts multi-element transmission to increase the communication rate, while the receiving end adopts multi-array element reception to obtain diversity gain. Compared with the SISO system, in addition to the intersymbol interference and error propagation phenomena, the MIMO system also has the problem of co-channel interference between multi-channel transmissions. These problems limit the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0413H04B7/06H04B7/08H04B13/02
CPCH04B7/0413H04B7/0417H04B7/0613H04B7/0845H04B13/02
Inventor 鄢社锋徐立军奚钧壹田婧秦晔
Owner 浙江望海潮科技有限公司
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