Efficient Polar Coded Selective Decode-and-Forward with Cooperative Decision Threshold in Cooperative Multi-Relay Transmissions
In some satellite Internet of Things (IoT) devices with terrain shielding, the qualities of the direct source-destination (S-D) channel are poor, requiring cooperative communications with multi-relays to be employed. In order to solve error propagation of current decode-and-forward (DF) on such occa...
| Main Authors: | , , , , |
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| Format: | Article |
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MDPI AG
2022-12-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/23/1/165 |
| _version_ | 1797431247372288000 |
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| author | Bin Jiang Yue Tang Jianrong Bao Chao Liu Yanhai Shang |
| author_facet | Bin Jiang Yue Tang Jianrong Bao Chao Liu Yanhai Shang |
| author_sort | Bin Jiang |
| collection | DOAJ |
| description | In some satellite Internet of Things (IoT) devices with terrain shielding, the qualities of the direct source-destination (S-D) channel are poor, requiring cooperative communications with multi-relays to be employed. In order to solve error propagation of current decode-and-forward (DF) on such occasions, an efficient polar coded selective decode-and-forward (SDF) cooperation method is proposed with a new decision threshold derived from channel state information (CSI). First, the proposed threshold is derived from the CSI by exploiting the channel gain ratio of optimal relay-destination link (R-D) with source-relay (S-R) link. The above R-D link possesses good channel quality among all links in the system. Second, when the channel gain ratio of certain relay links is larger than the aforementioned decision threshold, the source and all these relays cooperatively send messages together to the destination to accomplish perfect SDF transmission. Otherwise, all relays are frozen and the messages are directly transmitted through the S-D link. If it fails anyway, a retransmission is subsequently tried in the next transmission cycle. In addition, a polar code for fading channels is designed and adaptively adjusted to a proper code rate according to channel quality to attain good bit error rate (BER) performance. Simulation results show that the proposed scheme achieves about 0.9 and 0.5 dB gain at BER of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mn>10</mn><mrow><mo>−</mo><mn>4</mn></mrow></msup></semantics></math></inline-formula>, respectively, in multi-relay cooperative communications with multi-path fading channels compared with those of non-cooperation and existing polar coded cooperation channels. Therefore, the proposed polar coded SDF (PCSDF) scheme can improve both the BER and the outage probability (OP) performance in multi-relay cooperative systems, making it quite suitable for heterogeneous network applications in cooperative satellite IoT systems involving sixth-generation (6G) communications. |
| first_indexed | 2024-03-09T09:42:09Z |
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| institution | Directory Open Access Journal |
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| language | English |
| last_indexed | 2024-03-09T09:42:09Z |
| publishDate | 2022-12-01 |
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| series | Sensors |
| spelling | doaj.art-e1c2560ab23b4d6a9d75e6688badf8da2023-12-02T00:53:51ZengMDPI AGSensors1424-82202022-12-0123116510.3390/s23010165Efficient Polar Coded Selective Decode-and-Forward with Cooperative Decision Threshold in Cooperative Multi-Relay TransmissionsBin Jiang0Yue Tang1Jianrong Bao2Chao Liu3Yanhai Shang4School of Communication Engineering, Hangzhou Dianzi University, Hangzhou 310018, ChinaSchool of Communication Engineering, Hangzhou Dianzi University, Hangzhou 310018, ChinaSchool of Communication Engineering, Hangzhou Dianzi University, Hangzhou 310018, ChinaSchool of Communication Engineering, Hangzhou Dianzi University, Hangzhou 310018, ChinaSchool of Communication Engineering, Hangzhou Dianzi University, Hangzhou 310018, ChinaIn some satellite Internet of Things (IoT) devices with terrain shielding, the qualities of the direct source-destination (S-D) channel are poor, requiring cooperative communications with multi-relays to be employed. In order to solve error propagation of current decode-and-forward (DF) on such occasions, an efficient polar coded selective decode-and-forward (SDF) cooperation method is proposed with a new decision threshold derived from channel state information (CSI). First, the proposed threshold is derived from the CSI by exploiting the channel gain ratio of optimal relay-destination link (R-D) with source-relay (S-R) link. The above R-D link possesses good channel quality among all links in the system. Second, when the channel gain ratio of certain relay links is larger than the aforementioned decision threshold, the source and all these relays cooperatively send messages together to the destination to accomplish perfect SDF transmission. Otherwise, all relays are frozen and the messages are directly transmitted through the S-D link. If it fails anyway, a retransmission is subsequently tried in the next transmission cycle. In addition, a polar code for fading channels is designed and adaptively adjusted to a proper code rate according to channel quality to attain good bit error rate (BER) performance. Simulation results show that the proposed scheme achieves about 0.9 and 0.5 dB gain at BER of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mn>10</mn><mrow><mo>−</mo><mn>4</mn></mrow></msup></semantics></math></inline-formula>, respectively, in multi-relay cooperative communications with multi-path fading channels compared with those of non-cooperation and existing polar coded cooperation channels. Therefore, the proposed polar coded SDF (PCSDF) scheme can improve both the BER and the outage probability (OP) performance in multi-relay cooperative systems, making it quite suitable for heterogeneous network applications in cooperative satellite IoT systems involving sixth-generation (6G) communications.https://www.mdpi.com/1424-8220/23/1/165cooperative communicationspolar codingselective decode-and-forwardcooperative decision thresholdchannel state information |
| spellingShingle | Bin Jiang Yue Tang Jianrong Bao Chao Liu Yanhai Shang Efficient Polar Coded Selective Decode-and-Forward with Cooperative Decision Threshold in Cooperative Multi-Relay Transmissions Sensors cooperative communications polar coding selective decode-and-forward cooperative decision threshold channel state information |
| title | Efficient Polar Coded Selective Decode-and-Forward with Cooperative Decision Threshold in Cooperative Multi-Relay Transmissions |
| title_full | Efficient Polar Coded Selective Decode-and-Forward with Cooperative Decision Threshold in Cooperative Multi-Relay Transmissions |
| title_fullStr | Efficient Polar Coded Selective Decode-and-Forward with Cooperative Decision Threshold in Cooperative Multi-Relay Transmissions |
| title_full_unstemmed | Efficient Polar Coded Selective Decode-and-Forward with Cooperative Decision Threshold in Cooperative Multi-Relay Transmissions |
| title_short | Efficient Polar Coded Selective Decode-and-Forward with Cooperative Decision Threshold in Cooperative Multi-Relay Transmissions |
| title_sort | efficient polar coded selective decode and forward with cooperative decision threshold in cooperative multi relay transmissions |
| topic | cooperative communications polar coding selective decode-and-forward cooperative decision threshold channel state information |
| url | https://www.mdpi.com/1424-8220/23/1/165 |
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