Method and apparatus of a multiple-access communication system

A communication system and simultaneous communication technology, applied in multi-carrier systems, transmission systems, wireless communications, etc.

Active Publication Date: 2011-11-02
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method and apparatus of a multiple-access communication system
  • Method and apparatus of a multiple-access communication system
  • Method and apparatus of a multiple-access communication system

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[0024] To generate a signature sequence, the straightforward solution is to generate n user-specified phases at a time by computer trial and error to produce the lowest information transmission bit error rate, or to generate n user-specified phases in an online manner, where each time the user transmits data , the transmitter generates a new random signature sequence. This is usually done in a pseudo-random manner, with the receiver knowing the signature sequence at all times.

[0025] However, a problem related to the performance of systems applying such low-density signature sequences aimed at detecting BP detection methods is that such random or trial-and-error generated signature sequences can lead to unpredictable performance, with the result that different users may rely on Experience different performances depending on the star position of the signature sequence and the special matrix structure.

[0026] In overload conditions, there are more signature sequences than c...

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Abstract

Method and apparatus of a multiple-access communication system for simultaneous communication with a plurality of user entities are disclosed. Signature sequences are used to discriminate between signals to and/or from various user entities. In an example matrix representation, signature-sequences are describable as elements of a column of a signature-sequence matrix, said signature-sequence matrix being a low-density matrix and a matrix wherein non-zero elements of any single row of the matrix constitute distinct elements of a finite set of elements.

Description

technical field [0001] The invention relates to communication of a plurality of user entities of a multiple access communication system. In particular it concerns the identification between signals, communication sessions or connections in such systems related to various user entities through signature sequences. Background technique [0002] Information symbol spreading is a common method to achieve frequency diversity through multipath frequency selective fading propagation channels. It is also a method of providing simultaneous multiple access to multiple users (user entities) using a shared communication channel. Spread spectrum communication systems with multiple access functions based on user-specific spreading codes are generally referred to as code division multiple access (CDMA) systems (spreading codes are also commonly referred to as spreading signatures or signature sequences, but hereinafter "signature sequences " is used as a generic term for such codes / seque...

Claims

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Application Information

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IPC IPC(8): H04W74/00
CPCH04L5/0016H04L27/34H04L27/18
Inventor 布兰尼斯拉夫·波波维奇雅普·范德比克
Owner HUAWEI TECH CO LTD
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