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Improved communications apparatus and methods

A device, technology of a wireless communication system, applied in the direction of multiplex communication, prevention/detection of errors by diversity reception, modulation carrier system, etc.

Inactive Publication Date: 2005-11-23
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] However, time reversal and FDE-based space-time block coding incur overhead due to the use of guard intervals or cyclic prefixes
In addition, although the design of orthogonal time-division block codes extended to more than two transmit antennas (in "Space-Time Block Codes from Orthogonal Designs" by V. Tarokh, H. Jafarkhani and A.R. Calderbank, IEEE Transactions on Information Theory, vol .45, no.5, July 1999, described in pp.1456-1467) to achieve full space diversity, but does not use complex constellation (constellation) to provide maximum transmission rate

Method used

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  • Improved communications apparatus and methods
  • Improved communications apparatus and methods
  • Improved communications apparatus and methods

Examples

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Embodiment Construction

[0068] figure 1 A MIMO communication system 100 is shown. Information source 101 provides information symbol d to space-time encoder 102 at time n n , the space-time encoder 102 encodes the symbol into n I coded symbol x n 1 , x n 2 ,...x n nI , each of said encoded symbols is transmitted from one transmit antenna 104 simultaneously. no O receiving antennas 106 respectively receive the signal z n 1 ,z n 2 ,…z n nO , the signal is input to the receiver 108 . Receiver 108 provides at output 110 encoded transmitted symbols d n estimate There are multiple channels between transmit and receive antennas, for example all channels with two transmit and two receive antennas. Periodic pilot sequences in the transmitted signal can be used to estimate the time-varying response of these channels.

[0069] Encoded symbol x transmitted by transmit antenna 104 n 1 , x n 2 ,...x n nI Usually an encoded version of the input data or sequence of information. The encodin...

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Abstract

This invention relates to apparatus, methods and computer program code for transmission and reception in communication systems in which a receiver receives signals from a plurality of transmit antennas associated with a single transmitter. In particular this is related to MIMO (multiple input multiple output) and MISO (multiple input single output) channel based wireless systems. The present invention provides a method of transmitting a data sequence in a wireless communications system comprising: transmitting said data sequence from a first antenna; interleaving the data sequence; transmitting at least a part of the interleaved sequence from a second antenna spaced apart from the first antenna, the part of the interleaved sequence transmitted simultaneously with a part of the data sequence transmitted from the first antenna.

Description

technical field [0001] The present invention relates to apparatus, methods and computer program codes for transmitting and receiving in a communication system in which a receiver receives signals from multiple transmit antennas associated with a single transmitter. More specifically, the present invention relates to wireless systems based on MIMO (Multiple Input Multiple Output) and MISO (Multiple Input Single Output) channels. Background technique [0002] Wireless communication networks such as cellular networks and local area networks are known to suffer from interference and limited bandwidth due to the use of radio frequency (RF) signals. These problems are exacerbated in cluttered or scattered environments where there is multipath propagation of the signal where multiple copies of the transmitted signal are received. These copies are offset in time and, due to their different paths, generally receive different amounts of interference. They also interfere with each ot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J99/00H04L1/00H04L1/06H04L27/26
CPCH04L27/2602H04L1/0071H04L1/005H04L1/0068H04L1/0618H04B7/0669H04B7/0667
Inventor 余梦霜
Owner KK TOSHIBA
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