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Multi-antenna differential spatial modulation method suitable for fast-changing channel

A spatial modulation, multi-antenna technology, applied in diversity/multi-antenna systems, spatial transmit diversity, radio transmission systems, etc., can solve the problems of system capacity reduction, channel estimation accuracy reduction, overhead increase, etc., to solve the problem of capacity reduction. Effect

Active Publication Date: 2022-06-24
成都中科微信息技术研究院有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In multi-antenna units, different antenna units carry different spatial information, and the spectral efficiency can be improved through spatial modulation technology. In the existing common technologies, additional time-frequency resources need to be occupied for channel estimation. However, under fast-changing channels, it is necessary to More time-frequency resources are needed to track channel changes. Therefore, under the premise of limited time-frequency resources under fast-changing channels, the accuracy of channel estimation will be reduced, which will eventually lead to the failure of the system to operate normally.
Even if more pilot information is inserted to adapt to the changes of fast-changing channels, this method will bring about the disadvantages of increased overhead and reduced system capacity

Method used

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  • Multi-antenna differential spatial modulation method suitable for fast-changing channel
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  • Multi-antenna differential spatial modulation method suitable for fast-changing channel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Take four transmit antennas and QPSK modulation as an example to perform differential space-time coding.

[0059] Specifically:

[0060] Step S1, according to the number of transmitting antennas being 4, calculate the total number of antenna activation matrices k=24 according to formula 1,

[0061] k=4! ...Formula 1

[0062] Where k is the number of antenna activation matrices, ()! Represents the factorial of the data in parentheses.

[0063] Step S2: Calculate 24 permutations B according to the array [1, 2, 3, 4], and each permutation in B is different in pairs. The following table shows the complete set of permutations B;

[0064] Table 1 Matrix column address complete set B

[0065]

[0066]

[0067] Step S3, according to the QPSK modulation method, the IQ data corresponding to the 0 symbol is 0.7071+0.707*i, and the initialization matrix is ​​constructed as

[0068] where i is the imaginary unit.

[0069] Step S4: According to the above arrangement se...

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Abstract

The invention discloses a multi-antenna differential spatial modulation method suitable for a fast-changing channel, which can effectively track the channel change under the fast-changing channel by adopting a differential spatial modulation (DSM) method, and avoids the problem of system failure caused by limited time-frequency resources in the prior art. And the differential spatial modulation method (DSM) does not need to perform channel estimation, so that pilot signal transmission at a transmitting end is not needed, and a large amount of pilot information is prevented from being transmitted to adapt to a fast-changing channel, thereby solving the problem of capacity reduction under the fast-changing channel.

Description

technical field [0001] The invention belongs to the field of multi-antenna spatial multiplexing and wireless communication technology, and in particular relates to a multi-antenna differential spatial modulation method suitable for fast-changing channels. Background technique [0002] In the multi-antenna OFDM system, the role of MIMO can be divided into two, to improve the reception performance or improve the system capacity, often in the 5G system, the second role of MIMO is more focused, and the spatial modulation technology (Spatial Modulation, SM) is used to improve the system. capacity. [0003] In a multi-antenna unit, different antenna units carry different spatial information, and spectral efficiency can be improved through spatial modulation technology. In the existing common technologies, additional time-frequency resources are occupied for channel estimation. However, under fast-changing channels, it is necessary to More time-frequency resources can track channe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0413H04B7/06H04L1/06
CPCH04B7/0413H04B7/0697H04L1/06Y02D30/70
Inventor 薛顺瑞卜智勇薛凯韩晓萌姜曾赵虹斌
Owner 成都中科微信息技术研究院有限公司
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