Quadrature amplitude modulation qubit demodulation method and device

A technology of quadrature amplitude modulation and demodulation method, applied in the field of communication, which can solve the problems of increasing the amount of calculation, prolonging the processing time, and reducing the efficiency of demodulating soft bit information, so as to reduce the amount of calculation, improve efficiency, and improve the operation process. simple effect

Active Publication Date: 2015-01-14
大唐联诚信息系统技术有限公司
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Problems solved by technology

Although this demodulation method no longer performs complex exponential operations, it still needs to calculate the distance between the received symbol and each constellation point in the Gray constellation diagram. The higher the order of quadrature

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  • Quadrature amplitude modulation qubit demodulation method and device
  • Quadrature amplitude modulation qubit demodulation method and device
  • Quadrature amplitude modulation qubit demodulation method and device

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[0039] In order to enable those skilled in the art to better understand the technical solutions in this application, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the drawings in the embodiments of this application. Obviously, the described The embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work should fall within the protection scope of this application.

[0040] See figure 1 This figure shows the flow of an embodiment of the quadrature amplitude modulation soft bit demodulation method of the present application. The process includes:

[0041] Step S101: Predetermine the zone to which each constellation point belongs on the complex plane of the Gray constellation corresponding to the bit to be demodulated,...

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Abstract

The embodiment of the invention discloses a quadrature amplitude modulation qubit demodulation method. The method includes the steps of predetermining a sub-area which each constellation point belongs to on a gray constellation complex plane corresponding to a bit position to be demodulated, wherein each sub-area corresponds to a perpendicular bisector; determining a sub-area which each constellation point containing the corresponding bit position to be demodulated and mapped by a received symbol on the gray constellation complex plane corresponding to the bit position to be demodulated; calculating the perpendicular distance between each received symbol containing the corresponding bit position to be demodulated and the corresponding perpendicular bisector, and making the distances serve as the qubit values of the bit position to be demodulated, wherein the qubit values are positive when each received symbol containing the corresponding bit position to be demodulated is located on the side, with the first bit value, of the corresponding perpendicular bisector, and the qubit values are negative when each received symbol containing the corresponding bit position to be demodulated is located on the side, with the second bit value, of the corresponding perpendicular bisector. The invention further discloses a quadrature amplitude modulation qubit demodulation device. By means of the quadrature amplitude modulation qubit demodulation method and device, the qubit demodulation efficiency can be improved.

Description

technical field [0001] The present application relates to the field of communication technology, in particular to a quadrature amplitude modulation (QAM) soft bit demodulation method and a corresponding device. Background technique [0002] In order to improve spectrum utilization, modern communication systems usually adopt high-order modulation. Quadrature Amplitude Modulation (Quadrature Amplitude Modulation, QAM) is a commonly used high-order modulation method, and since its modulation order M can be 4, 8, 16, 32, it can also reach 128, 256 or more. After adopting quadrature amplitude modulation, its decoding system usually adopts BICM (Bit-Interleaved Coded Modulation) of soft decision decoding. This decoding method requires the demodulator to output soft bit information. Soft bit information is usually measured by the Log-Likelihood Ratio (LLR) of the received bits, namely: [0003] LLR ( b ) = ...

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Application Information

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IPC IPC(8): H04L27/38
CPCH04L27/3809
Inventor 黄习文杨远曹晏波
Owner 大唐联诚信息系统技术有限公司
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