CN-117335935-B - OFDM-IM transmission method adopting bit interleaving code modulation

Abstract

The invention relates to an OFDM-IM transmission method adopting bit interleaving code modulation, belongs to the technical field of wireless communication, and solves the problems that the prior art cannot acquire frequency diversity gain, has weaker transmission performance and cannot acquire high detection performance after combining channel coding and OFDM-IM. Dividing and processing input bit information to obtain SAP information and constellation diagram symbol information through a data transmitting method, obtaining an OFDM-IM data block based on the SAP information and the constellation diagram symbol information, transmitting data after processing, processing the received information through a data receiving method, independently and parallelly detecting the processed received information to obtain SAP soft information and constellation diagram symbol soft information respectively, obtaining a detection result of the constellation diagram information by utilizing the SAP soft information, obtaining a detection result of index information by utilizing the constellation diagram symbol soft information, and combining the detection results to obtain output bit information. The high detection performance is obtained after the acquisition of the frequency diversity gain and the combination of the channel coding and the OFDM-IM are realized.

Inventors

• LIU JIALI
• WANG QINGBO
• PENG XUEMING
• WU YUE
• WANG CANCAN
• ZHOU JUN

Assignees

• 北京机械设备研究所

Dates

Publication Date

20260508

Application Date

20220623

Claims (6)

1. 1. The OFDM-IM transmission method adopting bit interleaving coded modulation is characterized by comprising a data transmission method and a data receiving method, wherein, The data transmitting method comprises the steps of dividing input bit information to obtain index information and constellation diagram information, respectively processing the index information and the constellation diagram information to obtain SAP information and constellation diagram symbol information, obtaining an OFDM-IM data block based on the SAP information and the constellation diagram symbol information, and transmitting the data after processing; The data receiving method comprises the steps of processing received information, independently and parallelly detecting the processed received information to respectively obtain SAP soft information and constellation diagram symbol soft information, obtaining a detection result of the constellation diagram information by utilizing the SAP soft information, obtaining a detection result of index information by utilizing the constellation diagram symbol soft information, merging the detection results of the index information and the constellation diagram information, and obtaining output bit information; Independently and parallelly detecting the processed received information to obtain SAP soft information, wherein the method comprises the steps of performing LLR calculation processing on the processed received information to obtain LLR of the SAP information, and performing bit de-interleaving on the LLR of the SAP information Processing, SISO detection processing and bit interleaving Processing to obtain SAP soft information; The method comprises the steps of independently and parallelly detecting the processed received information to obtain constellation symbol soft information, wherein the method comprises the steps of performing LLR calculation processing on the processed received information to obtain LLR of the constellation symbol information, and performing bit de-interleaving on the LLR of the constellation symbol information Processing, SISO detection processing and bit interleaving Processing to obtain constellation diagram symbol soft information; the method comprises the steps of carrying out cross feedback on the SAP soft information and constellation symbol soft information, correcting LLRs of the constellation symbol information by utilizing the SAP soft information, and continuously carrying out independent parallel detection; The method for obtaining the detection result of the index information by using the constellation diagram symbol soft information comprises the steps of carrying out cross feedback on the SAP soft information and the constellation diagram symbol soft information, correcting LLRs of the SAP information by using the constellation diagram symbol soft information, and continuously carrying out independent parallel detection, and stopping iteration when the detection performance is unchanged, so as to obtain the detection result of the index information.
2. 2. The OFDM-IM transmission method using bit interleaved coded modulation according to claim 1 wherein processing the index information to obtain SAP information comprises: Sequentially carrying out code rate on the index information to obtain the code rate Convolutional encoding and bit interleaving of (a) Coding processing to obtain index coding information; and carrying out index modulation on the index coding information to obtain the SAP information.
3. 3. The method for OFDM-IM transmission using bit interleaved coded modulation according to claim 1 wherein processing the constellation information to obtain constellation symbol information comprises: sequentially carrying out code rate on the constellation diagram information to obtain the following code rates Convolutional encoding and bit interleaving of (a) Coding processing to obtain constellation diagram coding information; and carrying out constellation diagram modulation on the constellation diagram coding information to obtain the constellation diagram symbol information.
4. 4. An OFDM-IM transmission method using bit interleaved coded modulation according to any of claims 1-3, wherein the obtaining an OFDM-IM data block based on SAP information and constellation symbol information comprises: obtaining a data arrangement matrix according to the SAP information; multiplying the data arrangement matrix with constellation symbol information to obtain the OFDM-IM data block.
5. 5. The method for OFDM-IM transmission using bit interleaved coded modulation according to claim 1 wherein the processing followed by data transmission comprises: Symbol interleaving the OFDM-IM data block Processing, namely scattering symbol information of each group; and performing IFFT processing on the scattered symbol information, adding a cyclic prefix, and transmitting.
6. 6. The OFDM-IM transmission method using bit interleaved coded modulation according to claim 1, wherein processing the received information comprises: sequentially performing cyclic prefix removal processing, FFT processing and symbol de-interleaving on the received information And processing to obtain the processed receiving information.

Description

OFDM-IM transmission method adopting bit interleaving code modulation Technical Field The invention relates to the technical field of wireless communication, in particular to an OFDM-IM (orthogonal frequency division multiplexing-index modulation, orthogonal Frequency Division Multiplexing with index modulation) transmission method adopting bit interleaving coded modulation. Background With the development of wireless communication technology, OFDM-IM (orthogonal frequency division multiplexing-index modulation, orthogonal Frequency Division Multiplexing with index modulation) technology is increasingly applied. The OFDM-IM technique divides the sub-carriers of the entire data block into a plurality of groups, activates a part of the sub-carriers in each packet to transmit symbol information in each slot, and simultaneously carries additional information using SAP (sub-carrier activation pattern Subcarrier Activation Pattern). In OFDM-IM technology, the energy of the inactive sub-carriers may be reconfigured to transmit information on the active sub-carriers, and the symbol information of the active sub-carriers may acquire a certain power gain. OFDM-IM may be considered a more flexible OFDM multi-carrier transmission technique, and OFDM may be considered as a special case where OFDM-IM activates all sub-carriers to transmit symbol information without utilizing SAP to carry additional information. There are studies showing that pure OFDM does not acquire frequency diversity gain in multipath channels, so pure OFDM-IM also suffers from the problem that frequency diversity gain cannot be acquired and transmission performance is weak. Meanwhile, channel coding plays a vital role in wireless communication and is an important means for improving transmission reliability, however, after combining the channel coding with the OFDM-IM technology, it has a certain difficulty to design an effective receiving end structure to realize better detection performance. In summary, the existing OFDM-IM technology has problems that the frequency diversity gain cannot be obtained, the transmission performance is weak, and it is difficult to achieve high detection performance after combining channel coding with OFDM-IM. Disclosure of Invention In view of the above analysis, the present embodiment of the present invention aims to provide an OFDM-IM transmission method using bit interleaved coded modulation, so as to solve the problem in the prior art that the frequency diversity gain cannot be obtained, the transmission performance is weak, and it is difficult to achieve high detection performance after combining channel coding with OFDM-IM. The aim of the invention is mainly realized by the following technical scheme: the embodiment of the invention provides an OFDM-IM transmission method adopting bit interleaving coded modulation, which comprises a data transmission method and a data receiving method, wherein, The data transmitting method comprises the steps of dividing input bit information to obtain index information and constellation diagram information, respectively processing the index information and the constellation diagram information to obtain SAP information and constellation diagram symbol information, obtaining an OFDM-IM data block based on the SAP information and the constellation diagram symbol information, and transmitting the data after processing; the data receiving method comprises the steps of processing received information, independently and parallelly detecting the processed received information to obtain SAP soft information and constellation diagram symbol soft information respectively, obtaining a detection result of the constellation diagram information by utilizing the SAP soft information, obtaining a detection result of index information by utilizing the constellation diagram symbol soft information, and combining the detection results of the index information and the constellation diagram information to obtain output bit information. Based on further improvement of the above method, processing the index information to obtain SAP information includes: sequentially performing convolutional coding with a code rate of r 1 and bit interleaving pi 1 coding treatment on the index information to obtain index coding information; and carrying out index modulation on the index coding information to obtain the SAP information. Based on the further improvement of the method, the constellation diagram information is processed to obtain constellation diagram symbol information, which comprises the following steps: Sequentially performing convolutional coding with a code rate of r 2 and bit interleaving pi 2 coding on the constellation diagram information to obtain constellation diagram coding information; and carrying out constellation diagram modulation on the constellation diagram coding information to obtain the constellation diagram symbol information. Based on the further improvement of the method, the obt