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CCK modulation method in wireless local area network

A technology of wireless local area network and modulation method, which is applied in the field of wireless local area network communication, and can solve the problems of low spectrum efficiency and coding gain

Active Publication Date: 2010-06-23
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a CCK modulation method in a wireless local area network, which solves the problems of low spectral efficiency and coding gain in the prior art

Method used

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  • CCK modulation method in wireless local area network
  • CCK modulation method in wireless local area network
  • CCK modulation method in wireless local area network

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Embodiment Construction

[0019] The present invention will be described in more detail below in conjunction with the accompanying drawings.

[0020] CCK can be regarded as a subclass of Golay complementary code - multi-phase Golay complementary code. The construction method of multi-phase Golay complementary code is as follows:

[0021] make Represents a pair of sequences (0≤φ 0 ≤2π, 0≤φ 1 ≤2π, 0≤φ 1 ≤2π), then A 2 with B 2 The sufficient condition to be a complementary sequence is φ′ 2 = φ 2 +φ 1 -φ 0 + π.

[0022] It is simply written as the phase matrix

[0023] A 2 B 2 = φ 0 φ 1 φ ...

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Abstract

The invention discloses a CCK modulation method in a wireless local area network, which inputs by 5 bits and outputs by 16 chips. The method comprises the following steps: the first two bits of the input 5 bits are used for DQPSK modulation to obtain relative phase; the last 3 bits of the last 5 bits are mapped into three QPSK phases. The implementation method of the complementary code keying codeword structure in the wireless local area network adopts a novel multi-phase complementary code construction method, so the ratio of the bit rate to the chip rate is between 2 / n and 1 / 2 with more grades, the adaptation with different rates of a communication environment is convenient, and the performance of technical implementation is improved.

Description

technical field [0001] The invention belongs to a processing method in the field of wireless local area network communication, in particular to a spread spectrum modulation method in a direct sequence spread spectrum system. Background technique [0002] In the prior art, the direct sequence spread spectrum system is widely used and can be applied to wireless local area networks, such as the IEEE 802.11b standard. In the IEEE 802.11b standard, a spread spectrum method called Complementary Code Keying (CCK, Complementary Code Keying) is used, which can actually be regarded as a combination of spread spectrum, coding and modulation. [0003] The code word (or spread spectrum sequence) of CCK is a multi-phase complementary code, which not only has quasi-orthogonality, but also has good aperiodic autocorrelation characteristics. Due to the quasi-orthogonality, the Euclidean distance between codewords is large, and it has better performance in Additive White Gaussian Noise (AGWN...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/69H04W84/12
Inventor 周化雨王士林汪赟
Owner TCL CORPORATION
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