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Lattice reduction aided decoding in wireless MIMO receivers

A lattice statute and statute technology, applied in the field of multiple-input multiple-output communication systems and wireless communications, which can solve the problems of element reliability changes and different noises.

Inactive Publication Date: 2009-02-11
KK TOSHIBA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, however, the unquantized solution that appears in The noise in the elements of is different
therefore, The reliability of the elements may vary significantly

Method used

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  • Lattice reduction aided decoding in wireless MIMO receivers
  • Lattice reduction aided decoding in wireless MIMO receivers
  • Lattice reduction aided decoding in wireless MIMO receivers

Examples

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Embodiment Construction

[0056] Embodiments of the present invention will now be described with reference to the accompanying drawings.

[0057] The invention will now be described with reference to an implementation of the invention for equalization in a wireless communication system. Figure 3 shows such a system comprising a MIMO data communication system 10 having a generally known structure. Novel components in accordance with certain embodiments of the invention will be apparent from the description below.

[0058] The communication system 10 includes a transmitter device 12 and a receiver device 14 . It will be appreciated that in many cases a wireless communication device will be equipped with combined transmitter and receiver facilities, but for this example the device is shown as a single-way communication device for simplicity.

[0059] Transmitter device 12 includes a data source 16 that provides data (including information bits or symbols) to a channel encoder 18 . The channel encoder 1...

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Abstract

In a lattice-reduction-aided receiver based wireless communications system, soft estimates of transmitted bit values are determined from a received signal by applying lattice reduction to the channel estimate and equalising the received signal in accordance with the reduced basis channel, and determining probabilities of transmitted bits having particular values by generating a set of candidate vectors in the reduced basis based on nearest candidate vectors, determining a corresponding transmitted symbol vector for each candidate vector and, on the basis of the received signal determining the probability of each transmitted bit value having been transmitted.

Description

technical field [0001] The present invention relates to the field of wireless communications and in particular, but not exclusively, to the field of Multiple Input Multiple Output (MIMO) communication systems. Background technique [0002] Traditional communication systems can be expressed mathematically as: [0003] y=Hx+v [0004] where, for a MIMO communication system, y is an n×1 vector representing the received signal, H is an n×m channel matrix that simulates the transmission characteristics of the communication channel, x is an m×1 vector representing the transmitted symbols, and v is an n×1 noise vector, and where m and n denote the number of transmit and receive antennas, respectively. [0005] Those skilled in the art should understand that for multi-user detection in a CDMA system, the same expression can be used. [0006] Recent publications have demonstrated how the use of a technique called Lattice Reduction can improve the performance of MIMO detection meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/06H04L25/03
CPCH04L25/067H04L25/03242H04L1/0631H03M13/45H04L25/03203H04L25/03318
Inventor V·波纳帕兰姆M·S·T·桑德尔A·G·利利D·P·麦克纳马拉
Owner KK TOSHIBA
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