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Sphere decoding detection method based on ultra large scale integrated circuit

A large-scale integrated circuit, spherical decoding technology, applied in the direction of code conversion, electrical components, multiplexing communication, etc., to reduce computational complexity and improve resource utilization.

Inactive Publication Date: 2009-10-14
ST ERICSSON SEMICON BEIJING
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Problems solved by technology

[0007] However, for the K-Best algorithm, there is also how to get from K×M c (M c is the number of modulation points) to select the optimal K nodes and how to ensure that the performance is basically consistent with the performance of the maximum likelihood ML, and reduce the complexity of the algorithm as much as possible

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  • Sphere decoding detection method based on ultra large scale integrated circuit
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  • Sphere decoding detection method based on ultra large scale integrated circuit

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[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] For basic MIMO system models such as figure 1 As shown, assuming that the number of transmitting antennas is N t , the number of receiving antennas is N R , and its channel is a flat fading channel, then the system can be expressed by the following formula:

[0032] y=H s+n (1)

[0033] where y is N R ×1 received signal vector, s is N t ×1 transmit signal vector, n is N R ×1 noise vector with mean 0 and variance N 0 / 2, H is N R ×N t dimensional channel model vector (channel matrix).

[0034] Using the maximum likelihood estimation algorithm, the expression is as follows:

[0035] min s ∈ Ω | | n ...

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Abstract

The invention provides a sphere decoding detection method based on an ultra large scale integrated circuit, comprising the following steps of: A. carrying out QR decomposition to a channel matrix; B. multiplying conjugate transpose of a Q matrix and received signals to obtain an equalizing signal Rho; C. setting the searching node number Ki of an ith layer; D. determining sphere decoding expression according to an R matrix and Rho, carrying out table-looking-up sequencing to the nodes of the 1st layer and reserving K1 of nodes with minimum Euclidean distances; E. respectively executing searching of the ith layer, carrying out table-looking-up sequencing in nodes according to the sphere decoding expression to the Ki-1 of nodes reserved by the ith-1st layer, calculating weights of subnodes of the Ki-1 of nodes, then carrying out divide-and-conquer sequencing to subnodes of the Ki-1 of nodes by adopting VLSI according to the result of table-looking-up sequencing and reserving Ki of nodes with minimum weights; and F. outputting decoding result when searching the last layer. The sphere decoding detection method can effectively reduce the operation complexity of sphere decoding.

Description

technical field [0001] The invention belongs to the field of wireless communication, in particular to a VLSI-based sphere decoding detection method for a multiple-input multiple-output (MIMO) system, and the invention can also be applied to orthogonal frequency division multiplexing (OFDM) Detection of MIMO signals in OFDM) and MIMO systems. Background technique [0002] In the current wireless communication standard and its evolution process, multiple input and output antenna technology has been widely used. Both in the 3GPP long term evolution technology (long term evolution, LTE) and in the 802.16 series technical evolution versions, the orthogonal frequency division multiplexing and MIMO technologies are widely used as key technologies. Compared with the traditional single-input-output (SISO) system, the reception of the MIMO system is to detect the MIMO signal when it overlaps each other in the time and frequency domains. Therefore, the complexity of MIMO signal detect...

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Application Information

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IPC IPC(8): H04J13/00H03M7/00H04B7/00H04L29/00
Inventor 邓冰
Owner ST ERICSSON SEMICON BEIJING
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