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An Adaptive Modulation and Coding Method Based on Dual Block Error Rate and Signal-to-Noise Ratio Difference

A technology of adaptive modulation and modulation coding, which is applied in the field of communication, can solve problems such as the difficulty in setting the SNR threshold, achieve strong channel adaptability, good system transmission performance, and simple implementation

Active Publication Date: 2019-03-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] What the present invention aims to solve is to provide an adaptive modulation and coding method based on double block error rate and signal-to-noise ratio difference. Adaptive modulation and coding, and use adaptive PER threshold and robust ΔSNR threshold to overcome the difficulty of setting the SNR threshold in different wireless channel environments in traditional fixed threshold methods, and can overcome the adaptive modulation based on dual parameters The MCS ping-pong effect of the coding method can optimize the adaptive modulation and coding, effectively improve the performance of the system, and further improve the spectral efficiency of the system while ensuring the reliability of data transmission in the communication system.

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Embodiment Construction

[0044] Below in conjunction with accompanying drawing and embodiment, describe technical solution of the present invention in detail:

[0045] The transmission method (flow process) and reception method (flow process) of this embodiment are the same as the background technology. The OFDM system is adopted, the channel coding adopts the Turbo coding method, and the modulation methods are BPSK, QPSK, 16QAM, and 64QAM. 15 times spread spectrum, the modulation and coding method adopts adaptive modulation and coding based on double block error rate and SNR difference, the MCS index table is shown in the following table, where the channel information rate is the transmission rate of modulation bits, and the source information rate is considered The transmission rate of source information bits after spreading, pilot frequency and synchronization overhead.

[0046] Table 2 MCS index

[0047]

[0048] The technical solution of the present invention will be described in detail below...

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Abstract

The invention belongs to the technical field of communication, and relates to an adaptive modulation coding method based on double block error rates and a signal to noise ratio difference value. According to the adaptive modulation coding method provided by the invention, a current total PER, a segmented PER and an SNR difference value of the system are used as judgment reference, when the system meets reliable transmission conditions, the upper and lower thresholds of the segmented PER are adaptively adjusted according to channel conditions, thereby having the advantages of simple implementation, strong channel adaptability and good system transmission performance, the system spectrum efficiency can be further improved while ensuring the information transmission reliability, and it is conducive to the practical application of engineering.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to an adaptive modulation and coding method based on a double error block rate and a signal-to-noise ratio difference. Background technique [0002] As a key technology of future communication, OFDM (Orthogonal Frequency Division Multiplexing) technology has become a hot spot in the field of communication research, and the combination of OFDM technology and adaptive modulation and coding technology is an important topic in this research field. In wireless communication, the characteristics of the channel change with time, and how to effectively use the limited frequency band resources is an important research direction. Adaptive modulation and coding is a technology to improve spectrum utilization. It can adaptively change the modulation and coding parameters of the system according to the change of channel characteristics, so as to improve the system spectrum efficiency and max...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/2628H04L27/265H04L27/2697
Inventor 程郁凡刘小玲庄倩倩唐万斌王小青
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA