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adaptive modulation method

An adaptive modulation and self-adaptive technology, applied in digital transmission systems, error prevention, electrical components, etc., can solve problems such as high complexity, occupying too many computing and communication resources, and large amount of calculation, so as to reduce the amount of calculation, The effect of small average calculation amount and low bit error rate

Active Publication Date: 2019-09-06
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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Problems solved by technology

[0019] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide an adaptive modulation method for solving the problems of high complexity, large amount of calculation, and excessive calculation and communication resources in the prior art

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Embodiment Construction

[0068] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0069] see Figure 3 to Figure 6 . It should be noted that the diagrams provided in this embodiment are only schematically illustrating the basic idea of ​​the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed arb...

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Abstract

The invention provides an adaptive modulation method. The method comprises: S1, obtaining a channel state based on a channel estimation result; S2, according to the channel state, carrying out dynamic grouping on all sub carriers; S3, on the basis of the grouping, distributing information to groups adaptively and modulating the information based on bit numbers of the groups after distribution; and S4, carrying out corresponding demodulation on the information. Compared with an adaptive modulation algorithm without grouping, the adaptive modulation method with grouping enables the calculation load to be reduced substantially under the circumstances that the error rates are close to each other; compared with the adaptive modulation algorithm with fixed grouping, the adaptive modulation method provided by the invention enables the error code rate and the average calculation load to be reduced; and adaptive dynamic grouping is realized and the method is suitable for various complicated channel environments.

Description

technical field [0001] The invention relates to the field of mobile digital communication, in particular to an adaptive modulation method. Background technique [0002] The current mobile digital communication field has entered the 4G era, and the communication quality and communication rate have been greatly improved compared with the 3G era. Orthogonal Frequency Division Multiplexing (OFDM) technology is exactly the 4G era. One of the key technologies. In the OFDM system, the channel is divided into multiple orthogonal sub-channels, each sub-channel can be independently modulated by sub-carriers, and each sub-carrier is transmitted in parallel, so the OFDM system can adopt a mixed modulation method; because of this feature, it is proposed in the OFDM system A new technology, that is, adaptive modulation technology (Adaptive modulation, AM). like figure 1 as shown, figure 1 It is shown as a flow block diagram of an adaptive modulation OFDM system in the prior art; adapt...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L5/00
Inventor 张笑宇唐玮圣童子磊魏建明
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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