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Method and device for realizing MIMO signal detection

A signal detection and signal technology, applied in the direction of preventing/detecting errors through diversity reception, shaping network in transmitter/receiver, baseband system components, etc. Determination of problems such as high computational complexity risks, to achieve the effect of improving realizability, improving detection performance, and reducing detection complexity

Active Publication Date: 2012-12-19
DATANG MOBILE COMM EQUIP CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of this method is that it is difficult to determine the distance parameter for constructing candidate sets. If the distance parameter is too large, it will have the same complexity as ML detection. If the distance parameter is too small, repeated searches may be required; and the The complexity of the detection method varies greatly. In the actual system, it may bring a large risk of computational complexity. Therefore, it does not fundamentally solve the complexity problem of the traditional ML detection algorithm in constructing the candidate set.

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  • Method and device for realizing MIMO signal detection
  • Method and device for realizing MIMO signal detection
  • Method and device for realizing MIMO signal detection

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Experimental program
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Embodiment 2

[0030] (1), after obtaining the initial estimated value of the transmitted signal in step 201, calculate the i-th (i=1, 2...L) layer initial estimated signal The distance to each constellation point can be calculated by the following formula:

[0031] J i = | | x ~ i - s | | 2 2 , s ∈ Φ ,

[0032] Among them, J i Indicates the distance between the initial estimated signal and each constellation point, ||a|| 2 2 Indicates the 2-norm of a, Φ is the set of modulation constellation points;

[0033] (2) Sorting the distance J of the i-th (i=1, 2...L) layer, and obtaining the sequence number of each constellation point in Φ after sorting; wherein, th...

Embodiment 3

[0039] (1), after determining the survival set, for the survival set Λ i For the j-th (j=1, 2...M_best) signal in the i-th (i=1, 2...L) layer, first reconstruct and subtract it from the total received signal , to get the received signal that eliminates the signal interference of this layer, namely

[0040] r ‾ = r - H ( : , i ) Λ i ( j ) , Among them, H(:, i) represents the i-th column of H, and A i (j) means Λ i The jth element of ;

[0041] (2), re-perform quadratic linear detection on the signal after interference cancellation in step (1), and obtain the initial estimated value of the new transmitted signal The specific quadratic linear detection method is basically the same as the linear detection in step 201, e...

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Abstract

The invention relates to a method and a device for realizing MIMO signal detection, and the method comprises the following steps: carrying out linear detection on received signals, and obtaining initial estimated values of transmitted signals; determining a survival set of each layer of data according to the initial estimated values of the transmitted signals; utilizing the survival sets to construct a candidate set of all the layers of the data; and searching a signal vector with the smallest distance between the received signals and the reconstructed received signals in the constructed candidate set, and completing the maximum likelihood signal detection. The application of the method and the device can greatly reduce the detection complexity, significantly improve the detection performance of a receiving machine and simultaneously improve the realizability in an actual system under the situation of ensuring that the demodulation performance can approach the maximum likelihood detection algorithm.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method and device for realizing MIMO (Multiple-Input Multiple-Output, Multiple-Input Multiple-Output) signal detection. Background technique [0002] In LTE (Long Term Evolution, long-term evolution) and next-generation wireless communication systems, MIMO technology is mostly used to improve spectrum efficiency. Among them, the MIMO system uses multiple transmitting antennas and multiple receiving antennas to transmit wireless signals. Compared with the traditional single-antenna transceiver system, the MIMO system can significantly increase the bandwidth and antenna transmission power. Improve wireless spectrum utilization. [0003] At present, there are mainly two types of signal detection methods in MIMO systems: linear detection and ML (Maximum Likelihood, maximum likelihood) detection or simplified ML detection; and the detection performance of ML ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04L25/02H04L25/03
Inventor 陆会贤黄琛戴晓明
Owner DATANG MOBILE COMM EQUIP CO LTD