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Wireless communication apparatus

A wireless communication system and equipment technology, applied in channel estimation, error prevention/detection through diversity reception, shaping network in transmitter/receiver, etc., can solve the problems that the performance has not been proven in the public, the method is complicated, etc.

Inactive Publication Date: 2009-03-04
KK TOSHIBA
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Problems solved by technology

The method proposed by Windpassinger et al. is complex, and the performance of the technique has not been proven in the public

Method used

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  • Wireless communication apparatus
  • Wireless communication apparatus
  • Wireless communication apparatus

Examples

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Embodiment Construction

[0055] The invention will now be described with reference to an implementation of the invention for equalization in a wireless communication system. Figure 4 Such a system is shown 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.

[0056] 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.

[0057] Transmitter device 12 includes a data source 16 that provides data (including information bits or symbols) to a channel encoder 18 . The channel encoder 18 is followed by a channel interleaver 20 and, in the example shown, by a space-time encoder 22 . A space-tim...

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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 selecting a core candidate vector in the reduced basis, determining a set of mapping functions between the core vector in the reduced basis and transmitted symbol vectors from which a set of candidate transmitted symbol vectors can be generated, generating a set of transmitted symbol vectors based on the mapping functions 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] A traditional communication system 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 the same notation can be used for multi-user detection in a CDMA system. [0006] Recent publications have demonstrated how the use of a technique called Lattice Reduction can improve the performance of MIMO detection method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L1/06H04L25/06
CPCH04L25/0204H04L25/03318H04L1/0631H04L25/03242H04L2025/03426H04L25/067H03M13/45
Inventor D·P·麦克纳马拉M·S·T·桑德尔A·G·利利
Owner KK TOSHIBA
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