Superposition coded modulation method based on subcarrier index modulation (SIM)-orthogonal frequency division multiplexing (OFDM)

A superposition coding modulation and coding technology, applied in the field of communication anti-jamming, which can solve the problems of low power, inability to divide and merge, and insignificant performance.

Inactive Publication Date: 2014-10-22
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] In SCM, the more layers are superimposed, the lower the power allocated to each layer, the more serious the interference between layers, and the more difficult it is for the receiving end to distinguish the signals of each layer. If the information of each layer cannot be distinguished , it cannot be divided and merged, so the performance is less and less obvious as the number of superimposed layers increases

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  • Superposition coded modulation method based on subcarrier index modulation (SIM)-orthogonal frequency division multiplexing (OFDM)
  • Superposition coded modulation method based on subcarrier index modulation (SIM)-orthogonal frequency division multiplexing (OFDM)
  • Superposition coded modulation method based on subcarrier index modulation (SIM)-orthogonal frequency division multiplexing (OFDM)

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[0035]The present invention combines superposition coding modulation with SIM-OFDM, so that the sending end of the SCM can select a certain subcarrier to send data in each time slot according to certain rules, so that the receiving end can use a certain method to compare the index bits Decoding is performed to find effective subcarriers and corresponding channel parameter values. Therefore, at the receiving end of the SCM, only the Gaussian approximation method needs to be used for detection. As long as an appropriate method is adopted for decoding the index bits, the combination of SCM and SIM-OFDM can obtain better performance gains than the combination of other modulation methods and SIM-OFDM. details as follows:

[0036] S1. Generate M from digital sources 1 +M 2 ×L information bits, after a serial-to-parallel converter, before M 1 bits as index bits, after M 2 ×L bits are used as data bits, and the data bits are sent to another serial-to-parallel converter;

[0037]...

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Abstract

The invention relates to the technical field of communication anti-jamming, in particular to a superposition coded modulation (SCM) technology communication system, subcarrier index modulation (SIM) and related time domain detecting technologies. According to an SCM method based on SIM-orthogonal frequency division multiplexing (OFDM), ideas of SIM-OFDM and spatial modulation (SM) are used as reference, a part of a string of bit data is used for transmission, the other part of the string of bit data is used as indexing bits, and the indexing bits are respectively coded. During transmission in an OFDM system, particular subcarrier is selected for transmitting data according to the bit data after coding of the indexing bits. A maximum likelihood method is used at a receiving end to obtain soft information of the indexing bits, and the indexing bits are decoded. Compared with prior SCM methods, the SCM method based on the SIM-OFDM has the advantages that the SCM superposition layers are reduced, the complexity is reduced, and error rate performances can be maintained or even improved to a certain degree. Meanwhile, the SCM is used for replacing quadrature amplitude modulation (QAM), and performances can be improved under the same transmission efficiency.

Description

technical field [0001] The invention belongs to the technical field of communication anti-jamming, and in particular relates to a superposition coded modulation (Superposition Coded Modulation) communication system, a subcarrier index modulation (Subcarrier Index Modulation, SIM) and related time domain detection technology. Background technique [0002] In noisy channels, coded modulation can be efficiently and reliably transmitted, such as early trellis coded modulation (TCM) and multilevel coded modulation, which can get better performance gains when combined with binary coded multi-ary signals. And bit-interleaved coded modulation (BICM) can obtain better performance with a relatively simple method. The Superposition Coded Modulation (SCM) can be regarded as a special case of BICM. The detection complexity of BICM system increases exponentially with the number of transmitted bits, while the complexity of SCM increases with the increase of the number of layers, and the p...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L27/26
Inventor 谭佳肖悦王顺顺柏慧荣但黎琳李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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