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Method and apparatus for constructing null frequency encoding

A technology of space-frequency coding and construction method, which is applied in the field of communication, and can solve problems such as non-orthogonal codewords of space-frequency coding

Active Publication Date: 2008-12-17
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Embodiments of the present invention provide a construction method and device for space-frequency coding, which solves the problem of non-orthogonal space-frequency coding codewords in the prior art, and realizes complete diversity of frequency-selective channels

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  • Method and apparatus for constructing null frequency encoding

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Embodiment 2

[0092] The performance of the space-frequency coding obtained by the block-repeated space-frequency coding construction method in the second embodiment is consistent with the performance of the space-frequency coding obtained by the repeated mapping space-frequency coding construction method in the first embodiment.

[0093] The following analyzes the performance of Embodiment 1 and Embodiment 2 under the two-path channel and COST207 channel model.

[0094] (1) The performance of space-frequency coding under the two-path channel model

[0095] Assume that in the two-path channel with equal power delay distribution, consider the situations where the delay is 5μs and 20μs respectively. Since the bandwidth of the system is 1MHz and the number of subcarriers of OFDM is 128, the cycle of OFDM symbols is T=128μs. Assuming that the length of the cyclic prefix CP is T / 4=32μs, it can be guaranteed that there is no ISI between OFDM symbols.

[0096] The performance of space-frequency c...

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Abstract

The embodiment of the invention discloses a construction method of a space-frequency code, comprising: generating a space-time block encoding matrix; repeating the space-time block encoding matrix for gamma times to obtain a repetition matrix, wherein gamma is the frequency diversity module; cascading the repetition matrix to obtain the space-frequency code word. The embodiment of the invention also discloses a construction method of the space-frequency code, comprising: grouping the data symbol assembly, repeating each group of symbols for gamma times, to obtain a new data symbol assembly, wherein gamma is the frequency diversity module; performing the orthotropic space-time block encoding on the new data symbol assembly, to obtain the space-frequency code word. According to the space-frequency code constructed by the two methods, the orthogonality of the generated entire diversity space-frequency code under the normal frequency response is ensured, thereby lowering the complexity of the coding, furthermore advancing the performance of the space-frequency code under different channels.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a construction method and device for space-frequency coding. Background technique [0002] With the development of wireless communication technology, people put forward higher requirements for the effectiveness and reliability of wireless transmission. MIMO (Multiple Input Multiple Output, Multiple Input Multiple Output) technology uses multiple antennas at both ends of the wireless communication link, which can make full use of multi-path transmission in wireless propagation, so that spectrum utilization and link reliability have been improved. Great improvement. In MIMO technology, the input bit information needs to undergo space-time block coding before it can be sent. [0003] The study of space-time block coding assumes that the channel is flat fading, but in a broadband wireless system, if the symbol length is smaller than the multipath delay of the channel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/25H03M13/27
Inventor 朱学生
Owner HUAWEI TECH CO LTD
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