Subcarrier Index Modulation (SIM)-Orthogonal Frequency Division Multiplexing (OFDM) based superposition coded modulation method

A superposition coding modulation and modulator technology, applied in the field of communication anti-jamming, can solve the problems of insignificant SCM performance, low power, and inability to combine diversity

Inactive Publication Date: 2014-03-19
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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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
[0005] The present invention draws on the ideas

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  • Subcarrier Index Modulation (SIM)-Orthogonal Frequency Division Multiplexing (OFDM) based superposition coded modulation method
  • Subcarrier Index Modulation (SIM)-Orthogonal Frequency Division Multiplexing (OFDM) based superposition coded modulation method
  • Subcarrier Index Modulation (SIM)-Orthogonal Frequency Division Multiplexing (OFDM) based superposition coded modulation method

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Embodiment Construction

[0027] S1. Generate 2·M·L information bits from the digitized information source through the serial-to-parallel converter ST 1 After that, it is divided into two parts, and the first M·L information bit is used as the index data bit of SIM modulation, denoted as BT 1 , the last M·L bit information is denoted as BT 2 , where L is the number of layers modulated by SCM, and M is the number of bits on each layer of SCM;

[0028] S2, the BT mentioned in S1 1 Perform index bit encoding, interleave the encoded index data, and send the index bits obtained by interleaving to the SIM modulator. At the same time, the BT described in S1 2 After passing through a serial-to-parallel converter, the data is divided into L layers before transmission. The data of each layer has M bits. After spreading, interleaving, and BPSK modulation with a length of S, the obtained data is sent to the SIM. The modulator is waiting to be sent, wherein the code rate of the index bit is consistent with the c...

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Abstract

The invention belongs to the communication anti-jamming technical field, relates to a Superposition Coded Modulation (SCM) communication system, Subcarrier Index Modulation (SIM) and a related time domain detection technology of the SIM and discloses an SIM-OFDM based superposition coded modulation method. By referring to SIM-OFDM ideas and spatial modulation (SM) ideas, one part of a series of bit data is used for transmission, one part is used as index bits, the index bits determine how the sent data select weighted values, the sent data are multiplied by the selected weighted values and then transmitted to channels to be subjected to noise adding, a maximum likelihood method is used at the receiving end to calculate a posterior probability of each weighted value, and accordingly, the index bits and the selected weighted values can be obtained. According to the method, the SCM superposition layers are decreased, the complexity is reduced, and the bit error rate performance is maintained to some extent and even improved.

Description

technical field [0001] The invention belongs to the technical field of communication anti-jamming, and relates to a superposition coded modulation (Superposition Coded Modulation, SCM) 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 performanc...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L1/00
Inventor 谭佳肖悦余旖王顺顺徐斌李婧
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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