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Improved selection criterion for quantized precoded spatial multiplexing MIMO

A precoding matrix and the selected technology are applied in the field of precoding spatial multiplexing MIMO communication systems, which can solve the problems of SNR reduction and data rate reduction, and achieve high data rate and reduce computational complexity.

Inactive Publication Date: 2009-06-24
SONY CORP
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Problems solved by technology

However, the use of quantized imperfect precoding matrices results in a reduction in SNR and a reduced data rate

Method used

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  • Improved selection criterion for quantized precoded spatial multiplexing MIMO
  • Improved selection criterion for quantized precoded spatial multiplexing MIMO
  • Improved selection criterion for quantized precoded spatial multiplexing MIMO

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Embodiment Construction

[0041] The general idea of ​​the present invention is now explained with reference to a specific embodiment of the present invention. The general idea of ​​the present invention is to select from the precoding matrix codebook the precoding matrix codebook that provides the best signal-to-noise ratio (SNR (signal-to-noise ratio)) matrix, thereby making computing the SVD unnecessary and providing improved data transfer performance.

[0042] figure 2 A communication system 6 comprising two communication devices 1-1, 1-2 according to an embodiment of the invention is shown. The communication device 1-1 includes a transmitting unit 2-1, a receiving unit 3-1 and a link controller 4-1. The communication device 1-2 includes a transmitting unit 2-2, a receiving unit 3-1 and a link controller 4-2. The communication devices 1-1 and 1-2 are identical. Both the communication devices 1-1, 1-2 can operate as receivers and as transmitters. In figure 2 In the scenario described in , the ...

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Abstract

The present invention relates to the fields of precoded spatial multiplexing MIMO communication systems, especially to the subject of selecting precoding matrices. The present invention especially relates to a communication device, a communication method and a software program product. The MIMO communication device according to the present invention comprises a memory for storing a plurality of MIMO precoding matrices realizing the transmission side encoding of an Eigenbeamforming system; a controller for calculating, for each of at least some of the stored precoding matrices, an indicator value of the SNR of at least one decoupled transmission channel based on at least part of the corresponding precoding matrix, and for selecting one of said stored precoding matrices based on said calculated at least one indicator value of the SNR; and a MIMO detector for detecting symbols based on said selected precoding matrix. Because selection of the precoding matrices is based on SNR indicator values, the SNR can be optimized which is resulting in a higher data rate. Moreover, no computationally complex calculation of a SVD is required for the precoding matrix selection according to the present invention.

Description

technical field [0001] The present invention relates to the field of precoded spatially multiplexed MIMO communication systems and in particular to the subject of selecting a precoding matrix. In particular the invention relates to a communication device, a method for operating a communication device and a software program product. Background technique [0002] It is known that precoding can improve the performance of MIMO (multiple-input-multiple-output) communication systems. figure 1 A prior art precoded MIMO communication system including a transmitter 100 and a receiver 101 is shown. A MIMO communication system has N>=2 transmit paths (also referred to as transmit ports) and M>=2 receive paths (also referred to as receive ports). Each transmit port may, for example, correspond to an antenna for transmission, and each receive section may, for example, correspond to an antenna for reception. The symbol vector s at the transmitter 100 is multiplied by the MIMO precodi...

Claims

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Application Information

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IPC IPC(8): H04L1/06H04L25/03H04L27/26
CPCH04B7/0439H04B7/0639H04B7/0697H04B7/0854H04L2025/03426H04L25/03343H04B7/0617
Inventor D·施奈德L·斯塔德尔迈耶A·施沃格
Owner SONY CORP
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