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A Lattice Reduction Aided Linear Detection Method in Generalized Spatial Modulation

A technique of generalized spatial modulation and linear detection, which is applied in the field of linear detection assisted by lattice reduction in generalized spatial modulation, and can solve problems such as not meeting LR requirements.

Inactive Publication Date: 2020-06-09
HARBIN INST OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the existing V-BLAST linear detection process cannot be directly used in GSM and the traditional QAM modulation does not meet the LR requirements, and propose a lattice-based reduction-assisted linear detection method in generalized spatial modulation

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  • A Lattice Reduction Aided Linear Detection Method in Generalized Spatial Modulation
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  • A Lattice Reduction Aided Linear Detection Method in Generalized Spatial Modulation

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specific Embodiment approach 1

[0033] Specific implementation mode one: combine figure 1 To illustrate this embodiment, the specific process of a lattice-based reduction-assisted linear detection method in generalized spatial modulation in this embodiment is as follows:

[0034] Since MMSE equalization can be written in the form of ZF equalization under a certain matrix transformation, ZF equalization represents linear equalization in the following.

[0035] Step 1. Set an LR-assisted linear detection 8-QAM constellation diagram in GSM. The 8-QAM constellation diagram includes quadrature branch and in-phase branch. There are 9 grid points on the coordinate axes of quadrature branch and in-phase branch. : (-1,1), (0,1), (1,1), (-1,0), (0,0), (1,0), (-1,-1), (-1 ,0), (-1,1), where (0,0) is the constellation point adopted by the inactive antenna, and other constellation points are selected by the active antenna according to the bit content of the modulation symbol information; for example:

[0036] ...

specific Embodiment approach 2

[0045] Embodiment 2: This embodiment differs from Embodiment 1 in that: the LR algorithm in the step 2 uses a complex LLL algorithm; the LLLs are A.K. Lenstra, H.W. Lenstra, and L. Lovász.

[0046] Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0047] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the new channel matrix H obtained according to step two in step three LR Perform ZF equalization on the received signal y to obtain an intermediate estimate The specific process is:

[0048]

[0049] in Indicates rounding each dimension component of the vector; for H LR The conjugate transpose of ; * is the conjugate transpose.

[0050] Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a lattice reduction assisted linear detection method in generalized spatial modulation. The invention relates to a lattice reduction assisted linear detection method in generalized spatial modulation. The invention aims to solve the problems that the linear detection process of existing V-BLAST (Vertical Bell Labs Layered Space-Time) cannot be directly used for GSM (Generalized Spatial Modulation) and conventional QAM (Quadrature Amplitude Modulation) does not meet the LR (Lattice Reduction) requirement. The lattice reduction assisted linear detection method has the specific process of 1, setting a LR assisted linear detection 8-QAM constellation diagram in the GSM; 2, obtaining a new channel matrix HLR and a unimodular matrix T; 3, obtaining an intermediate estimated value (with reference to the specification); 4, according to the unimodular matrix T obtained in the step 2 and the intermediate estimated value obtained in the step 3, calculating out an estimated value (with reference to the specification) of a transmission symbol X; 5, obtaining a spatial symbol estimated value (with reference to the specification); and 6, detecting out a modulation signal symbol (with reference to the specification) from the estimated value (with reference to the specification) of the transmission symbol X, and according to the spacial symbol estimated value (with reference to the specification) and the modulation signal symbol (with reference to the specification), completing lattice reduction assisted linear detection in the generalized spatial modulation. The lattice reduction assisted linear detection method disclosed by the invention is used for the field of wireless communication signal detection.

Description

technical field [0001] The invention relates to a lattice reduction assisted linear detection method in generalized space modulation. Background technique [0002] Spatial modulation (SM) technology is a very promising MIMO transmission technology in future mobile communication networks. This technique can meet communication system throughput requirements with high power efficiency and low complexity. Compared with the traditional MIMO system, the SM data stream bits are divided into two parts: spatial information bits and modulation symbol information bits. When using the channel to send information each time, the antenna serial number to be activated is determined according to the spatial information bits, and then the number of antennas to be activated is determined according to the modulation symbol bits. for amplitude and phase modulation. In the SM system, only one radio frequency link is required for each communication, which not only reduces the hardware cost, but ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/34H04B7/08
CPCH04B7/0854H04B7/0857H04L27/3433H04L27/3483
Inventor 张文彬王晨刘春刚
Owner HARBIN INST OF TECH
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