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Method for constructing multimode quadrature amplitude modulation (QAM) uniform constellation diagram label and modulator

A construction method and constellation diagram technology, applied in the field of communication, can solve problems such as increased complexity, resource consumption, and complex mapping relationships, and achieve the effects of convenient control, improved utilization, and easy switching

Inactive Publication Date: 2012-04-11
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

If the adaptive QAM modulation system contains more modulation methods, its mapping relationship will be more complex, and more mapping tables need to be established, which will undoubtedly increase the complexity and resource consumption of the system implementation.
It can be seen that the difference between different modes of QAM constellation labeling rules is obviously a disadvantage for adaptive multi-mode QAM modulation

Method used

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  • Method for constructing multimode quadrature amplitude modulation (QAM) uniform constellation diagram label and modulator
  • Method for constructing multimode quadrature amplitude modulation (QAM) uniform constellation diagram label and modulator
  • Method for constructing multimode quadrature amplitude modulation (QAM) uniform constellation diagram label and modulator

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Embodiment Construction

[0018] see figure 1 , a method for constructing a multi-mode QAM unified constellation label in the present invention, comprising a constellation construction step and a constellation label construction step.

[0019] (1) The construction steps of the constellation diagram label include:

[0020] 2 2n The QAM unified constellation label consists of 2n-bit labels, namely b 2n-1 b 2n-2 …b n+1 b n b n-1 b n-2 …b 1 b 0 Composition, where n is a natural number greater than 0; the upper n bits in the above 2n-bit tags are b 2n-1 b 2n-2 …b n+1 b n Indicates the level value of Q channel, the lower n bits are b n-1 b n-2 …b 1 b 0 Indicates the level value of the I channel; the derivation rule of the n-bit label indicating the level value of the I channel is the same as that of the n-bit label indicating the level value of the Q channel, and conforms to the mapping rule of the Gray code, that is

[0021] ①For I-way label b 0 and Q-way label b n :b 0 =1 represents the...

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Abstract

The invention discloses a method for constructing a multimode quadrature amplitude modulation (QAM) uniform constellation diagram label and a modulator. By the method, a uniform label which comprises various 2<2n> QAM square constellation diagrams is constructed, wherein n is a natural number and is more than or equal to 1; a constellation mapping table generated by the uniform label is stored into a designed constellation mapping module of a multimode QAM modulator, so that the modulator can adaptively finish 2<2n> QAM in different modes according to different control signals; only a uniform constellation mapping table is stored in hardware and all constellation mapping tables containing the modes do not need to be stored respectively during multimode 2<2n> QAM; therefore, during the hardware implementation, the utilization rate of hardware resources is increased; furthermore, switching among different modes of 2<2n> QAM is easy and convenient to control.

Description

technical field [0001] The invention relates to digital modulation and demodulation technology in the communication field, in particular to a construction method and modulator of a multi-mode QAM unified constellation label suitable for adaptive multi-mode quadrature amplitude modulation (QAM). Background technique [0002] Adaptive multi-mode QAM can dynamically adjust the number of modulation levels according to the real-time status of the channel and the different characteristics of the business, so that the transmission potential of the communication system can be fully tapped, and the spectrum utilization rate can be improved to obtain the maximum transmission capacity and high reliability. . When the system works in a non-fading channel, increase the number of constellation points to increase the transmission rate of the system; and when the system works in a fading channel, reduce the number of constellation points and reduce the transmission rate of the system to mak...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/36
Inventor 赵利王国正莫金旺蔡昆宏黄昌龙蔡成林
Owner GUILIN UNIV OF ELECTRONIC TECH
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