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Method for demodulation of the space-time trellis interlacing demodulation system

A technology of bit interleaving and system implementation, applied in multi-frequency code system, diversity/multi-antenna system, space transmit diversity, etc., can solve the problems of high computational complexity and cannot completely solve the computational complexity

Inactive Publication Date: 2009-07-08
XIDIAN UNIV +1
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Problems solved by technology

[0030] Ball packet-limited decoding needs to be based on the channel fading coefficient α ij and the required number of selected signal points to continuously adjust the radius of the ball bag to ensure that the desired number of signal points is just included in the drawn spherical area, so the computational complexity varies with the channel conditions and the number of selected signal points. , still can not completely solve the problem of computational complexity
[0031] Sequence decoding based on Gaussian approximation not only needs to calculate the matrix H H The inverse matrix of H, where H is the conjugate transpose operator of the matrix, also needs to calculate the inverse matrix of different covariance matrices N times, and the computational complexity is still very high

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  • Method for demodulation of the space-time trellis interlacing demodulation system
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  • Method for demodulation of the space-time trellis interlacing demodulation system

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Embodiment Construction

[0062] The core idea of ​​the present invention is: the ST-BICM system calculates the probability of each constellation point in the first transmitted symbol sequence according to the received signal, sorts the calculated probability of each constellation point, and starts from the value with the highest probability Select the preset M' signal points in turn; calculate the M' signal points selected from the (n-1)th transmitted symbol sequence one by one, and combine with each constellation point in the received nth transmitted symbol sequence The probability of each n-dimensional combined signal point in , and sort the calculated probabilities of each signal point, select the preset M′ n-dimensional signal points sequentially from the value with the highest probability, until n is equal to the number of transmitting antennas N, where n=2, 3, . . . N; calculating out-of-likelihood information of information bits corresponding to each of the obtained M′ N-dimensional signal point...

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Abstract

The invention discloses a demodulation method for a space-time bit-interleaved modulation (ST-BICM) system. The method reasonably selects signal points in a part of the transmission symbol sequence with relatively high probability as a set of selected signal vectors, and simply The likelihood information of the signal is calculated, which reduces the demodulation complexity and improves the demodulation efficiency.

Description

technical field [0001] The present invention relates to Space-Time Bit-Interleaved Coded Modulation (ST-BICM, Space-Time Bit-Interleaved Coded Modulation) system technology, especially soft-input soft-output (SISO, Soft-Input Soft-Output) in a space-time Bit-Interleaved Coded Modulation system The method by which the demodulator implements demodulation. Background technique [0002] Multiple-Input Multiple-Output (MIMO, Multiple-Input Multiple-Output) technology based on a multi-antenna array can provide multiple independent parallel sub-channels in space, and can effectively improve information rate or communication quality. [0003] Space-time coding is a channel coding method that is suitable for multi-antenna systems and can approach the channel capacity of multi-antennas. By concatenating the traditional binary channel coding technique with the space-time coding method, the performance close to the capacity of the multi-antenna channel can be obtained. According to th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04B7/04
Inventor 李颖李杰程鑫豪
Owner XIDIAN UNIV