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Fixed-point soft decision demodulation method of quadrature amplitude modulation technique

A technology of quadrature amplitude modulation and demodulation method, which is applied in quadrature multiplexing systems, amplitude modulation carrier systems, electrical components, etc., and can solve the problems of large errors, high computational complexity and high hardware implementation complexity.

Active Publication Date: 2008-12-31
SPREADTRUM COMM (SHANGHAI) CO LTD
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Problems solved by technology

[0005] In order to solve the shortcomings of the prior art QAM demodulation method, such as large errors, high computational complexity and high hardware implementation complexity, the present invention proposes a fixed-point soft-decision demodulation method for quadrature amplitude modulation technology

Method used

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  • Fixed-point soft decision demodulation method of quadrature amplitude modulation technique

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Embodiment Construction

[0038] figure 2 It is a flowchart of an embodiment of the fixed-point soft-decision demodulation method of the quadrature amplitude modulation technology of the present invention. It can be seen from the figure that the fixed-point soft-decision demodulation method of the quadrature amplitude modulation technology of the present invention includes the following steps:

[0039] Step 1, calculate the average value P of the absolute values ​​of the real part and the imaginary part for a section of the received symbol whose sampling length is N according to the following formula:

[0040] P = 1 2 N Σ i = 1 N ( | a i | + | b i | ) ...

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Abstract

Aiming at solving the defects of large error and high calculation and hardware implementation complexity of QAM (quadrature amplitude modulation) demodulation method in prior art, the invention proposes a fixed-point soft-decision demodulation method using QAM technology. The fixed-point soft-decision demodulation method for using QAM technology of the invention carries out soft decision on part defined bits of a received symbol with the mean of the absolute values of real part and imaginary part of the received symbol and then carries fixed-point soft decision on other bits with the hard-decision information of the part defined bits, thus simplifying the calculation and guaranteeing the modulation performance. In addition, the method is easy to be implemented with chip fixed-point algorithm.

Description

technical field [0001] The invention relates to the quadrature amplitude modulation and demodulation technology in the communication field, in particular to a fixed-point soft-decision demodulation method of the 64 quadrature amplitude modulation technology in the wireless communication system. Background technique [0002] In order to improve spectrum utilization and speed up data transmission rate, quadrature amplitude modulation and demodulation technology (hereinafter referred to as QAM) is often used for data transmission in the field of modern communication. For example: Wideband Code Division Multiple Access (hereinafter referred to as WCDMA) and Time Division Multiplexing Synchronous Code Division Multiple Access (hereinafter referred to as TD-SCDMA) wireless communication systems both use 64 quadrature amplitude modulation and demodulation technology (hereinafter referred to as 64QAM ). Compared with the modulation limit spectral efficiency of 16 quadrature amplitu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/04H04J11/00
Inventor 王俊沈静王茜竹
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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