Accumulation and Elimination: A Hard Decision-Based Multi-User Interference Cancellation Method in Satellite Communication System
With the increasing number of users in the Medium-Orbit (MEO) satellite communication system, multi-access interference (MAI) has become an important factor that restricts the reliability and capacity of the system. Additionally, the low carrier-power-to-noise-density ratio (<inline-formula>&l...
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MDPI AG
2023-12-01
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| Series: | Electronics |
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| Online Access: | https://www.mdpi.com/2079-9292/12/23/4878 |
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| author | Haohan Li Yongjia Jin Deguang Zhao Xuhui Ding Kai Yang |
| author_facet | Haohan Li Yongjia Jin Deguang Zhao Xuhui Ding Kai Yang |
| author_sort | Haohan Li |
| collection | DOAJ |
| description | With the increasing number of users in the Medium-Orbit (MEO) satellite communication system, multi-access interference (MAI) has become an important factor that restricts the reliability and capacity of the system. Additionally, the low carrier-power-to-noise-density ratio (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>C</mi><mo>/</mo><msub><mi>N</mi><mn>0</mn></msub></mrow></semantics></math></inline-formula>) resulting from long-distance transmission poses a significant concern. The parallel interference cancellation (PIC) algorithm, utilized within the paradigm of multi-user detection (MUD), exhibits the capability to effectively mitigate the impact of MAI within the same system. Simultaneously, coherent accumulation serves as a means to substantially enhance the correct detection probability (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>P</mi><mrow><mi>c</mi><mi>d</mi></mrow></msub></semantics></math></inline-formula>) at low <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>C</mi><mo>/</mo><msub><mi>N</mi><mn>0</mn></msub></mrow></semantics></math></inline-formula>. In this study, a signal acquisition method for multi-user spread spectrum satellite receivers is proposed, which employs interference cancellation and coherent accumulation as its core mechanisms. Furthermore, we introduce a power estimation method based on the outcomes of signal acquisition, which can be integrated into the signal reconstruction module of PIC. Finally, we implement the aforementioned algorithms in both simulation and hardware platforms. Remarkably, we observe that when the interference-to-signal ratio (ISR) caused by MAI equals 20 dB, the improved algorithm attains a maximum <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>P</mi><mrow><mi>c</mi><mi>d</mi></mrow></msub></semantics></math></inline-formula> of 0.95 within the high signal-to-noise ratio (SNR) region, closely approaching the theoretical limit for the bit error rate (BER). The experimental results prove the effectiveness and feasibility of the acquisition algorithm. In summary, the enhanced algorithm holds vast potential for widespread implementation in multi-user spread spectrum communication systems. |
| first_indexed | 2024-03-09T01:53:20Z |
| format | Article |
| id | doaj.art-dfea8d287b7c446ba500157dc8ceaee8 |
| institution | Directory Open Access Journal |
| issn | 2079-9292 |
| language | English |
| last_indexed | 2024-03-09T01:53:20Z |
| publishDate | 2023-12-01 |
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| spelling | doaj.art-dfea8d287b7c446ba500157dc8ceaee82023-12-08T15:14:19ZengMDPI AGElectronics2079-92922023-12-011223487810.3390/electronics12234878Accumulation and Elimination: A Hard Decision-Based Multi-User Interference Cancellation Method in Satellite Communication SystemHaohan Li0Yongjia Jin1Deguang Zhao2Xuhui Ding3Kai Yang4School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, ChinaSchool of Information and Electronics, Beijing Institute of Technology, Beijing 100081, ChinaSchool of Cyberspace Science and Technology, Beijing Institute of Technology, Beijing 100081, ChinaYangtze Delta Region Academy, Beijing Institute of Technology, Jiaxing 314019, ChinaSchool of Information and Electronics, Beijing Institute of Technology, Beijing 100081, ChinaWith the increasing number of users in the Medium-Orbit (MEO) satellite communication system, multi-access interference (MAI) has become an important factor that restricts the reliability and capacity of the system. Additionally, the low carrier-power-to-noise-density ratio (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>C</mi><mo>/</mo><msub><mi>N</mi><mn>0</mn></msub></mrow></semantics></math></inline-formula>) resulting from long-distance transmission poses a significant concern. The parallel interference cancellation (PIC) algorithm, utilized within the paradigm of multi-user detection (MUD), exhibits the capability to effectively mitigate the impact of MAI within the same system. Simultaneously, coherent accumulation serves as a means to substantially enhance the correct detection probability (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>P</mi><mrow><mi>c</mi><mi>d</mi></mrow></msub></semantics></math></inline-formula>) at low <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>C</mi><mo>/</mo><msub><mi>N</mi><mn>0</mn></msub></mrow></semantics></math></inline-formula>. In this study, a signal acquisition method for multi-user spread spectrum satellite receivers is proposed, which employs interference cancellation and coherent accumulation as its core mechanisms. Furthermore, we introduce a power estimation method based on the outcomes of signal acquisition, which can be integrated into the signal reconstruction module of PIC. Finally, we implement the aforementioned algorithms in both simulation and hardware platforms. Remarkably, we observe that when the interference-to-signal ratio (ISR) caused by MAI equals 20 dB, the improved algorithm attains a maximum <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>P</mi><mrow><mi>c</mi><mi>d</mi></mrow></msub></semantics></math></inline-formula> of 0.95 within the high signal-to-noise ratio (SNR) region, closely approaching the theoretical limit for the bit error rate (BER). The experimental results prove the effectiveness and feasibility of the acquisition algorithm. In summary, the enhanced algorithm holds vast potential for widespread implementation in multi-user spread spectrum communication systems.https://www.mdpi.com/2079-9292/12/23/4878Code Division Multiple Accessdirect sequence spread spectrumparallel interference cancellationcoherent accumulationacquisition |
| spellingShingle | Haohan Li Yongjia Jin Deguang Zhao Xuhui Ding Kai Yang Accumulation and Elimination: A Hard Decision-Based Multi-User Interference Cancellation Method in Satellite Communication System Electronics Code Division Multiple Access direct sequence spread spectrum parallel interference cancellation coherent accumulation acquisition |
| title | Accumulation and Elimination: A Hard Decision-Based Multi-User Interference Cancellation Method in Satellite Communication System |
| title_full | Accumulation and Elimination: A Hard Decision-Based Multi-User Interference Cancellation Method in Satellite Communication System |
| title_fullStr | Accumulation and Elimination: A Hard Decision-Based Multi-User Interference Cancellation Method in Satellite Communication System |
| title_full_unstemmed | Accumulation and Elimination: A Hard Decision-Based Multi-User Interference Cancellation Method in Satellite Communication System |
| title_short | Accumulation and Elimination: A Hard Decision-Based Multi-User Interference Cancellation Method in Satellite Communication System |
| title_sort | accumulation and elimination a hard decision based multi user interference cancellation method in satellite communication system |
| topic | Code Division Multiple Access direct sequence spread spectrum parallel interference cancellation coherent accumulation acquisition |
| url | https://www.mdpi.com/2079-9292/12/23/4878 |
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