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Adaptive modulation and coding method

A technology of adaptive modulation and coding method, which is applied in the direction of adjusting channel coding, channel estimation, calculation model, etc., and can solve problems such as inapplicable channels.

Active Publication Date: 2018-05-04
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After learning the scheme of adaptive selection of modulation and coding offline, if the channel state changes greatly, the learned scheme selection method cannot be applied to the changed channel

Method used

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  • Adaptive modulation and coding method

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Experimental program
Comparison scheme
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Embodiment

[0019] Step 1. Set six modulation and coding schemes as shown in Table 1, and the error rate of the scheme can be numbered from small to large, and the smaller the error rate, the fewer errors in the worse channel The information is transmitted more efficiently, but the corresponding throughput is also smaller. Among them, the channel condition corresponding to scheme 0 is extremely bad, so no information is sent;

[0020] Table 1 Six modulation and coding schemes

[0021]

[0022]

[0023] Step 2. The machine learning classification algorithm employs neural networks. Construct a three-layer neural network with 1933 input nodes (corresponding to the size of the channel matrix plus a Gaussian signal-to-noise ratio), 400 intermediate nodes, and 7 output nodes (corresponding to 7 schemes) and initialize the neural network. The algorithm of learning weight and updating weight adopts Adam optimization algorithm;

[0024] Step 3. At the receiving end, the current channel st...

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Abstract

The invention belongs to the technical field of wireless communication, and particularly relates to an adaptive modulation and coding method. According to the method disclosed by the invention, the process of further calculating channel state information to obtain sample characteristics is not required, and the channel state information is directly used as the sample characteristics; sample data does not need to be prepared in advance, the sample characteristics are acquired in real time, and sample tags are evaluated and adjusted in real time; and since the sample data is acquired in real time, even if a channel has a great change, the learning weight can also be adjusted in real time to adapt to the current channel state.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to an adaptive modulation and coding method. Background technique [0002] The idea of ​​adaptive technology was first proposed in the 1960s. It refers to the feedback of changing channel state information by the receiving signal end, and the sending signal end dynamically adjusts the modulation scheme, coding scheme and other signal transmission parameters during signal transmission. Under the premise of ensuring a certain system reliability, the throughput of information transmission is maximized. It is precisely because the link adaptive technology can provide a higher transmission rate under the same bandwidth and greatly improve the spectrum utilization rate, so it has become one of the key technologies that have attracted much attention in various communication systems. The traditional adaptive selection of modulation and coding is to select the mod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L25/02G06K9/62G06N99/00
CPCH04L1/0009H04L25/024G06N20/00G06F18/241
Inventor 林灯生胡智星肖鸣
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA