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MIMO detection method based on model disturbance and lattice reduction

A technology of lattice reduction and detection method, applied in the field of MIMO detection, which can solve the problems of equal complexity and performance gap.

Inactive Publication Date: 2018-11-06
TIANJIN POLYTECHNIC UNIV
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Problems solved by technology

Especially in long coherence time channels, optimal diversity can be achieved using lattice-based reduction, but the complexity is comparable to traditional OSIC detectors
However, there is still a significant performance gap between LRA-OSIC detectors and MLD (Maximum Likelihood Detectors) when the number of transmit antennas is large

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  • MIMO detection method based on model disturbance and lattice reduction
  • MIMO detection method based on model disturbance and lattice reduction
  • MIMO detection method based on model disturbance and lattice reduction

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Embodiment Construction

[0025] Below in conjunction with specific embodiment, further illustrate the present invention, it should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention, after reading the present invention, those skilled in the art will understand various equivalent forms of the present invention All modifications fall within the scope defined by the appended claims of the present application.

[0026] We now give an example of a MIMO spatial multiplexing system using QPSK modulation on a flat Rayleigh fading channel. The channel model is:

[0027]

[0028] where R R and R T are receiver and transmitter correlation matrices, respectively, (·) 1 / 2 represents the matrix square root, H ω with i.i.d., zero-mean complex Gaussian terms and unit variance.

[0029] we assume in[·] m，n Represents the (m, n)th item of the matrix, ρ R and ρ T (0≤ρ R , ρ T ≤1) indicates the level of spa...

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Abstract

The invention relates to the technology of communications, solves the defect that existing LRA-OSIC detector still has a big gap with the performance of a maximum likelihood detector when there are alarge number of antennas, and provides an MIMO detection method based on model disturbance and lattice reduction. The technical solution thereof may be summarized as: the method generates a pluralityof disturbance models of the same MIMO channel, constructs a standard LRA-OSIC detector for each model then, selects an optimal detector by using a maximum-likelihood criterion, and combines the stopping criterion to reduce the complexity. The invention has the beneficial effect that the bit error rate is obviously reduced only by increasing the complexity moderately.

Description

technical field [0001] The invention belongs to the technical field of MIMO detection, and relates to a MIMO detection method based on model perturbation and lattice reduction. Background technique [0002] Multiple-input multiple-output (MIMO) transmission is widely used as an effective method to improve the spectral efficiency of wireless communication. In MIMO systems, to recover the transmitted information, inter-antenna interference (CAI) must be resolved at the receiver. A Maximum Likelihood Detector (MLD) minimizes the bit error rate, but has exponential complexity. There are various suboptimal MIMO detectors, such as linear detectors, interference cancellation detectors, and fixed-complexity spherical decoders, etc. [0003] Lattice reduction (LR) can be combined with suboptimal MIMO detectors to further improve performance. Especially in long coherence time channels, using lattice reduction can achieve optimal diversity, but the complexity is comparable to tradit...

Claims

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Application Information

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IPC IPC(8): H04B7/0413H04B17/382
CPCH04B7/0413H04B17/382
Inventor 童军赵金灿肖志涛耿磊张芳
Owner TIANJIN POLYTECHNIC UNIV
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