Mutual-complementing code demodulating system

A technology of complementary codes and codewords, applied in the field of complementary codes, can solve the problems of reducing the anti-noise ability of complementary code modulation and anti-interactive symbol interference, etc., and achieve the effect of reducing geometric volume

Inactive Publication Date: 2003-09-24
ACCTON TECHNOLOGY CORPORATION
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Problems solved by technology

As shown in Table 1, about 40% of the CCK codewords have non-zero cross-correlation with each other. This kind of non-perfect orthogonality will reduce the anti-noise ability and anti-interactive symbol of complementary code modulation. Interference (CrossSymbol Interference) ability

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  • Mutual-complementing code demodulating system

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Embodiment Construction

[0149] The complementary code demodulation system provided by the present invention is designed for the non-completely orthogonal nature between 64 CCK codewords. At first, 64 CCK codewords need to be numbered, and φ1 is set to 0, (φ2 , φ3, φ4) from (0, 0, 0), (0, 0, π / 2), ..., (0, π / 2, 0), ..., to (3π / 2, 3π / 2 , 3π / 2), give these 64 complementary codes 64 numbers from 1 to 64 respectively.

[0150] After numbering the 64 CCK codewords according to the above numbering method, since the 64 CCK codewords are not completely orthogonal to each other, the 64 CCK codewords are grouped using a tree structure, please refer to Figure 3, It is a schematic diagram of tree structure grouping of 64 CCK codewords. The maximum mutual correlation between the 64 CCK codewords at the first stage 300 is 4√2. In the second stage 302 , the maximum correlation between the 32 CCK codewords in the first group 306 is 4, and the maximum correlation between the 32 CCK codewords in the second group 308 ...

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Abstract

A complement code demodulation system is used in two order coherence operation modulation system and a block domodem device in RAN which has a two order conherent character, utilizing incomplete orthogonal character between complement codes to decide the successive second order coherent operation according to the first by complement codes participating in the first and second coherent operation to reduce the operation to get the transferred complement codes quickly so as to simplify the hardware structure to increase the demodem speed including multiple address form first and second operationcircuits and multiple process modules form the third one having the function of third operation and fourth maximum value of known basic demodem device.

Description

technical field [0001] The invention relates to a complementary code (Complementary Code Keying; CCK) demodulation system (Demodulation System), in particular to a second-order correlation operation (Bi-stage Correlation Calculation) demodulation system and Fast Walsh Block (Fast Walsh Block) demodulation device, in order to reduce the operation steps of demodulation time, achieve the purpose of reducing hardware cost and shortening demodulation time. Background technique [0002] In recent years, with the popularization of personal computers and the vigorous development of the Internet, information from all over the world can be exchanged with each other, thereby promoting economic and technological progress. However, at present, the interconnection structure of most Internet networks uses different types of wire materials such as optical fibers, cables, and network cables for connection. Therefore, when setting up an Internet network or a local area network, it is complica...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/51H04L27/18
Inventor 张呈源黄志豪林泓均杨谷章张永贤赵轩庆
Owner ACCTON TECHNOLOGY CORPORATION
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