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Corrected vector disturbance soft demodulation method

A vector perturbation and soft demodulation technology, applied in the direction of DC level restoration device/bias distortion correction, digital transmission system, baseband system components, etc., can solve the problem of data not obeying Gaussian distribution and so on

Active Publication Date: 2022-02-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0003] However, the modulo operation is used in the VP technology, so that the data at the receiving end does not obey the Gaussian distribution

Method used

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  • Corrected vector disturbance soft demodulation method
  • Corrected vector disturbance soft demodulation method
  • Corrected vector disturbance soft demodulation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0041] In this example, the number of transmitting antennas is 4, the number of users is 4, and each user is configured with a receiving antenna. The modulation method uses normalized 16QAM modulation using Gray code, and one symbol corresponds to 4 bits {b 3 , b 2 , b 1 , b 0}, Channel coding uses convolutional codes, and decoding uses Viterbi decoding.

[0042] S1, first calculate b 0 = Probability of 0, b 0 corresponding to s i in-phase component of and That is to say M 0 ={-d,-3d}.

[0043] S2. Calculation

[0044] Weight the above probabilities to get b in the final LLR i = 0 part

[0045]

[0046] Consider M 0 Value limit, get b in the final LLR i = 0 part

[0047]

[0048] Similarly for b 0 = probability of 1, That is M 1 ={d,3d}, get

[0049] S3, calculate b 0 soft information

[0050] S4, get b respectively 3 , b 2 , b 1 After obtaining the soft information of the entire codeword, it is decoded by a decoder to obtain an estimate of ...

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Abstract

The invention belongs to the technical field of wireless communication, and particularly relates to a corrected vector disturbance soft demodulation method. In the method provided by the invention, the original LLR function is corrected, and the modulo part is considered in the function, so that the corrected function can meet the probability distribution requirement of the data after the modulo of the VP receiving end, and the output soft information is corrected. Compared with direct hard decision on the VP, the scheme provided by the invention can provide good performance gain; meanwhile, if the original LLR is used, the performance is even poorer than that of hard decision.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a modified vector perturbation soft demodulation method. Background technique [0002] Recently, a new nonlinear precoding technology - Vector Perturbation (Vector Perturbation, VP) precoding was proposed. The key idea is to select an additive perturbation vector to reshape the transmitted symbols, and obtain optimal perturbation vector. Through these vector perturbation techniques, the encoding technique can achieve performance close to the total capacity. On the other hand, soft decision technology uses soft information such as log-likelihood ratio (Log-Likelihood Ratio, LLR), combined with correlation channel coding technology to output soft information, so that the overall bit error performance of the system is better than that of hard decision and soft decision. big boost. [0003] However, the modulo operation is used in the VP technique, so th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0456H04L25/06
CPCH04B7/0456H04L25/067
Inventor 谭佳滨肖悦吴朝武
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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