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CN108540185B - Differential space modulation method combined with space-time block code - Google Patents

Differential space modulation method combined with space-time block code Download PDF

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CN108540185B
CN108540185B CN201810341143.7A CN201810341143A CN108540185B CN 108540185 B CN108540185 B CN 108540185B CN 201810341143 A CN201810341143 A CN 201810341143A CN 108540185 B CN108540185 B CN 108540185B
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matrix
differential
space
antenna
transmission
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CN108540185A (en
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吴朝武
肖丽霞
肖悦
王金福
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University of Electronic Science and Technology of China
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0612—Space-time modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)

Abstract

The invention belongs to the technical field of wireless communication, and particularly relates to a differential space modulation method combined with a space-time block code. In the proposed differential spatial modulation technique based on space-time coding, information is transmitted jointly by the active antenna matrix index and the constellation symbols. The bit information is transmitted through the rectangular differential matrix instead of the traditional square differential matrix, so that the problem that the transmission antenna matrix is increased sharply along with the increase of the antennas in the traditional differential system and is difficult to practically use is solved. Meanwhile, the characteristics of space-time coding and traditional differential spatial modulation are effectively combined, and the diversity gain brought by the space-time coding can be effectively obtained while the characteristics of the traditional differential spatial modulation are kept.

Description

Differential space modulation method combined with space-time block code
Technical Field
The invention belongs to the technical field of wireless communication, in particular to a novel differential space modulation scheme combined with a space-time block code; the present invention relates to techniques such as Differential Spatial Modulation (DSM), Space-time block coding (STBC), and MIMO (Multiple Input Multiple Output, MIMO).
Background
The differential spatial modulation technology is a novel MIMO technology which adopts incoherent detection based on the spatial modulation technology. And the transmitting end transmits information by adopting the activated transmission antenna matrix index and the constellation symbol. Therefore, the differential spatial modulation can accurately recover the transmitted information at the receiving end under the condition of no channel information by carrying out differential coding at the transmitting end while keeping the characteristic of the traditional spatial modulation single radio frequency. It has attracted extensive attention because it does not require channel information at both the transmitting and receiving ends and can retain the characteristics of a single radio frequency.
Traditional differential spatial modulation transmits bit information through a square antenna transmission matrix, the antenna transmission matrix condition being exponential with the number of transmitting antennas. For example, when the number of transmit antennas is 32, the antenna transmission matrix size is 2117, making it almost impossible to implement in practical use. Meanwhile, the performance of the differential spatial modulation is lost compared with the spatial modulation because the receiving end detects the transmitted information under the condition of no channel information.
Disclosure of Invention
The present invention aims to solve the above problems, and provides a novel differential spatial modulation transmission scheme combining STBC based on a conventional differential spatial modulation system, which can effectively improve the performance of the system and is suitable for a large-scale MIMO system.
The technical scheme of the invention is as follows:
a differential space modulation method combined with space-time block code is used for large-scale MIMO system, and N is set for MIMO systemtRoot transmitting antenna, NrSelecting 2 transmitting antennas to transmit data symbols at each time slot transmitting end, and setting the length of two time slots of the k group as BkIs divided into Bk 1And Bk 2Two parts, characterized in that the method comprises the steps of:
s1, obtaining Nt/2 antenna transmission vector set for differential spatial modulation
Figure BDA0001630673950000011
akIs a number NtA x 1-dimensional vector, and only one element is 1, and the other elements are 0;
s2, mixing each aq Element 1 in the antenna array is expanded into a 2 x 2 identity matrix, element 0 is expanded into a 2 x 2 zero matrix, and a new antenna transmission matrix set is obtained
Figure BDA0001630673950000021
By using
Figure BDA0001630673950000022
One bit is used to select the transmission antenna matrix Aq(q＝1,...,Q)；
S3, mixing
Figure BDA0001630673950000023
The bits are used to modulate two M-PSK constellation symbols
Figure BDA0001630673950000024
And
Figure BDA0001630673950000025
L1and L2The size of an M-PSK modulation constellation diagram is represented, and transmission is carried out by an activated transmission antenna matrix; the two constellation symbols form a space-time coding matrix
Figure BDA0001630673950000026
Obtaining the k-th symbol matrix as Xk＝AkIk，k>Nt/2；
S4 obtaining a transmitting matrix through differential coding
Figure BDA0001630673950000027
Is Sk＝G2[Sk-1]Xk，k>Nt/2；
Wherein for arbitrary matrices
Figure BDA0001630673950000028
Function G2[β]Is defined as:
Figure BDA0001630673950000029
the right shift matrix E is defined as:
Figure BDA00016306739500000210
front NtReference symbols transmitted in time slots, i.e. matrices
Figure BDA00016306739500000211
The invention introduces a novel differential spatial modulation MIMO technology. It effectively combines the characteristics of space-time coding and conventional differential spatial modulation. The diversity gain brought by space-time coding can be effectively obtained while the characteristic of the traditional differential spatial modulation is kept. Information is transmitted by the activated antenna matrix index and the constellation symbol together, in order to keep the characteristic of sparse radio frequency of a transmitting terminal, a novel antenna matrix is introduced, bit information is transmitted by a rectangular differential matrix instead of a traditional square differential matrix, and the problem that the transmitting antenna matrix is increased sharply along with the increase of the number of antennas is solved.
The invention has the beneficial effects that: the bit information is transmitted through the rectangular differential matrix instead of the traditional square differential matrix, so that the defect that the traditional differential system is difficult to be practically applied because the transmitting antenna matrix is sharply increased along with the increase of the antennas is overcome, and the system is suitable for a large-scale MIMO system. Meanwhile, diversity gain is obtained by combining with STBC, and the system performance is greatly improved. From simulation results, the proposed differential system is superior to other existing differential systems.
Drawings
FIG. 1 is a block diagram of a STBC-RDSM system;
FIG. 2 is a diagram of STBC-RDSM comparing performance with other DSM systems when the number of transmit antennas is 8;
FIG. 3 is a graphical representation of the comparison of STBC-RDSM performance with other DSM systems at 32 transmit antennas.
Detailed Description
The technical scheme of the invention is described in detail in the following with reference to the accompanying drawings and embodiments:
suppose that the differential spatial modulation system has N t4 transmitting antennas, the number of active antennas in each time slot is 2, and a QPSK modulation mode is adopted; the bit transmitted per slot is
Figure BDA0001630673950000031
Suppose that the bits transmitted in the i-7 th and i-8 th time slots are
Figure BDA0001630673950000032
Transmission vector for i-5 and i-6 time slot transmission
Figure BDA0001630673950000033
Step 1: first obtaining NtRDSM antenna transmission vector set of/2
Figure BDA0001630673950000034
Step 2: a is to1And a2 Element 1 in (1) is extended to be a 2 × 2 identity matrix, element 0 is extended to be a 2 × 2 zero matrix, and the antenna transmission matrix is obtained as
Figure BDA0001630673950000035
One bit (0) is used to select a transmission antenna matrix
Figure BDA0001630673950000041
And step 3:
Figure BDA0001630673950000042
the bits are modulated into two M-PSK constellation symbols 0.7071-0.7071i and 0.7071-0.7071i, which form a space-time coding matrix
Figure BDA0001630673950000043
Obtain the k symbol matrix of
Figure BDA0001630673950000044
And 4, step 4: obtaining a transmit matrix S by differential encodingk＝G2[Sk-1]Xk，(k>Nt/2)。
Figure BDA0001630673950000045
Front NtReference symbols transmitted in time slots, i.e. matrices
Figure BDA0001630673950000046

Claims (1)

1. A differential space modulation method combined with space-time block code is used for large-scale MIMO system, and N is set for MIMO systemtRoot transmitting antenna, NrSelecting 2 transmitting antennas to transmit data symbols at each time slot transmitting end, and setting the length of two time slots of the k group as BkIs divided into
Figure FDA0002913787270000011
And
Figure FDA0002913787270000012
two parts, characterized in that the method comprises the steps of:
s1, obtaining Nt/2 antenna transmission vector set for differential spatial modulation
Figure FDA0002913787270000013
akIs a number NtA x 1-dimensional vector, and only one element is 1, and the other elements are 0;
s2, mixing each akElement 1 in the antenna array is expanded into a 2 x 2 identity matrix, element 0 is expanded into a 2 x 2 zero matrix, and a new antenna transmission matrix set is obtained
Figure FDA0002913787270000014
By using
Figure FDA0002913787270000015
One bit is used to select the transmission antenna matrix Ak(k＝1,...,Q)，Q＝2；
S3, mixing
Figure FDA0002913787270000016
The bits are used to modulate two M-PSK constellation symbols
Figure FDA0002913787270000017
And
Figure FDA0002913787270000018
L1and L2The size of an M-PSK modulation constellation diagram is represented, and transmission is carried out by an activated transmission antenna matrix; the two constellation symbols form a space-time coding matrix
Figure FDA0002913787270000019
Obtaining the k-th symbol matrix as Xk＝AkIk，k>Nt/2；
S4 obtaining a transmitting matrix through differential coding
Figure FDA00029137872700000110
Is Sk＝G2[Sk-1]Xk，k>Nt/2；
Wherein for arbitrary matrices
Figure FDA00029137872700000111
Function G2[β]Is defined as:
Figure FDA00029137872700000112
the right shift matrix E is defined as:
Figure FDA00029137872700000113
front NtReference symbols transmitted in time slots, i.e. matrices
Figure FDA0002913787270000021
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CN116260502B (en) * 2023-05-15 2023-08-18 浙江香农通信科技有限公司 Double-domain index modulation communication method based on reconfigurable intelligent surface

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CN109547077B (en) * 2019-01-22 2020-10-13 重庆京东方智慧电子系统有限公司 Signal transmission method, signal reception method, communication device, and storage medium
CN111585629B (en) * 2020-05-21 2021-03-26 山东大学 A transmit precoding-assisted differential beam spatial modulation transmission and blind detection method
CN116418454A (en) * 2021-12-30 2023-07-11 维沃移动通信有限公司 Encoding method, apparatus, and readable storage medium
CN114665927B (en) * 2022-03-10 2023-08-08 成都中科微信息技术研究院有限公司 Multi-antenna differential spatial modulation method suitable for fast-varying channel
CN114629765B (en) * 2022-03-11 2023-01-31 电子科技大学 A Spatial Modulation Method Based on Space-Time Line Code and Antenna Offset
CN115037338B (en) * 2022-05-23 2024-06-04 中国信息通信研究院 Communication signal transmission method and equipment

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CN116260502B (en) * 2023-05-15 2023-08-18 浙江香农通信科技有限公司 Double-domain index modulation communication method based on reconfigurable intelligent surface

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