Multi-stream space shift keying modulation and demodulation method in a multi-input multi-output system

A modulation method and multi-output technology, applied in transmission systems, radio transmission systems, electrical components, etc., can solve problems such as large codebooks, inability to meet the needs of higher frequency efficiency, waste of resources at the sending end, etc., to improve spectrum efficiency Effect

Inactive Publication Date: 2017-12-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the above methods all use different combinations of activated antennas to carry the corresponding binary data. Although they have higher spectral efficiency than traditional SSK transmission, they still cannot meet the requirements for higher frequency efficiency in future 5G communications, and, The above method requires a codebook for mapping when sending at the sending end. When the number of antennas increases, the number of antenna combinations increases sharply, and the codebook becomes very large, which wastes resources at the sending end.

Method used

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  • Multi-stream space shift keying modulation and demodulation method in a multi-input multi-output system
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  • Multi-stream space shift keying modulation and demodulation method in a multi-input multi-output system

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Embodiment 1

[0053] Number of transmit antennas N t =4, the number of receiving antennas N r =4, the system transmits K=2 streams of data in total, and each stream of data contains b=2 bits of data, that is, the system sends data in groups of Kb=4 bits. Assume that sending 4bit data is 1101.

[0054] First, traditional SSK modulation is performed on the 2 channels of data to obtain the original antenna mapping number. The SSK modulation rule is to convert binary to decimal and add 1 to obtain n 1 = 4, n 2 =2. For the system of K=2, this embodiment uses BPSK symbols to distinguish different 2-stream data and satisfies the criterion that the modulation symbols of the odd-numbered stream and the even-numbered stream add up to 0, and the modulation symbols of the two streams satisfying the above rules are respectively x 1 =+1,x 2 =-1.

[0055] According to the antenna number determined by the above SSK modulation and the transmission symbol of each stream, the first transmission vector x...

Embodiment 2

[0062] N t = 4, N r =4, K=2, b=2, 1010 for sending 4bit data.

[0063] First, traditional SSK modulation is performed on the two channels of data to obtain the original antenna mapping number n 1 = 3, n 2 = 3, then choose x 1 =+1,x 2 =-1 as the modulation symbols of the two streams of data respectively.

[0064] According to the antenna number determined by SSK modulation and the transmission symbol of each stream, the first transmission vector x is obtained 1 =[0,0,1,0] T , the second emission vector x 2 =[0,0,-1,0] T .

[0065] The emission vectors generated by the two streams of data are sequentially superimposed. First, initialize the total send vector x=x 1 , and then the second emission vector x 2 superimposed on x, since the emission vector x 2 is the transmission vector generated by the even stream data. Before superimposing, compare whether the second stream data is the same as the first stream data. Consider the antenna index numbers of the first stream da...

Embodiment 3

[0068] N t =8,N r =4, K=4, b=3, the 12bit data to be sent is 111011100100.

[0069] First, traditional SSK modulation is performed on the 4 channels of data to obtain the original antenna mapping number. The SSK modulation rule is to convert binary to decimal and add 1 to obtain n 1 = 8, n 2 = 4, n 3 = 5, n 4 =5. For the system of K=4, this embodiment uses QPSK symbols to distinguish different 4-stream data and satisfies the criterion that the modulation symbols of adjacent odd-numbered streams and even-numbered streams add to 0, and two-stream modulation symbols satisfying the above rules can be obtained x respectively 1 =+1,x 2 =-1, x 3 = i, x 4 =-i.

[0070] According to the antenna number determined by the above SSK modulation and the transmission symbol of each stream, the first transmission vector x is obtained 1 =[0,0,0,0,0,0,0,1] T , the second emission vector x 2 =[0,0,0,-1,0,0,0,0] T , the third launch vector x 3 =[0,0,0,0,i,0,0,0] T , the fourth emis...

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Abstract

The invention discloses a multi-stream air-shift keying modulation and demodulation method in a multi-input multi-output system, belonging to the technical field of wireless communication. The modulation method of the present invention is as follows: the data to be sent is divided into multiple streams for SSK modulation, each stream is distinguished by a different fixed modulation signal, the modulated multi-stream data is sequentially superimposed, and the specific modulation symbol selection criteria and superimposition Algorithm, so that there will be no collision of transmission signals after the multi-stream information is superimposed, so that each stream of data can carry the transmission data of log2Nt bits, where Nt is the number of transmitting antennas. The invention also discloses a demodulation method suitable for the above modulation method. The modulation method of the present invention greatly improves the spectral efficiency of the SSK system by adding multiple transmission streams without changing the antenna configuration of the SSK system, and under the same spectral efficiency, it can obtain a higher frequency than the traditional VBLAST system and the enhanced VBLAST system. SSK system has a lower bit error rate.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to multiple-input multiple-output (MIMO) technology and space-shift keying modulation technology (SSK). Background technique [0002] Multiple Input Multiple Output (MIMO) technology, as one of the key technologies in the future wireless communication field, greatly improves link reliability and system spectrum efficiency (Spectrum Efficient, SE). A typical MIMO system is the layered space-time structure (VBLAST structure) proposed by Bell Laboratories. [0003] The VBLAST structure uses multiple signals to be multiplexed in space, and all antennas transmit signals at the same time at the same time. However, this method increases the system throughput and also produces inter-channel interference (ICI), and the complexity of the optimal detection algorithm (ML) increases exponentially with the increase of transmitting antennas. In order to reduce the comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04B7/0413
Inventor 方舒岳宗笛李磊李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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