دانش و فناوری هوافضا

دانش و فناوری هوافضا

لینک ارتباطی نرخ-بالا زیر طیف کانال ماهواره ای با چارچوب جدید SC-based HRL: حذف طیفی با الگوریتم QRD-RLS و انتقال داده طیف گسترده کدگذاری شده با BCH-LDPC

نوع مقاله : مقاله پژوهشی

نویسندگان
حسین اخلاق پسند 1
اکبر چگینی 2
سید محمد صباغ جعفری 3
1 دانشجوی پسادکتری، دانشکده مهندسی برق و کامپیوتر، پردیس دانشکدگان فنی، دانشگاه تهران، تهران، ایران
2 دانش آموخته کارشناسی، دانشکده مهندسی برق و کامپیوتر، دانشگاه زنجان، زنجان، ایران
3 دانش آموخته کارشناسی ارشد، دانشکده مهندسی برق و کامپیوتر، دانشگاه شیراز، شیراز، ایران
چکیده
در ارتباطات ماهواره‌ای با وجود هزینه‌ی بالای خرید پهنای باند، طیف راه‌اندازی شده روی پهنای باندِ خریداری از دید دیگران در دسترس بوده و امکان ایجاد اختلال وجود دارد. برای حل این چالش، دو نوع پردازشگر می‌تواند لینک ماهواره‌ای نرخ-بالا و غیر قابل کشف را زیر طیف معمولِ ماهواره‌ها فراهم کند: حذف‌کننده‌ی طیف ماهواره، راه‌اندازِ لینک زیر سطح نویز. در این مقاله، چارچوب جدیدی با عنوان لینک نرخ-بالای مبتنی بر حذف طیف (SC-based HRL) پیشنهاد می‌شود که در آن با استفاده از فیلتر QRD-RLS طیف معمول ماهواره بعنوان سیگنال تداخل بازسازی شده و سپس از سیگنال دریافتی در گیرنده حذف می‌شود؛ و در ادامه با بکارگیری پردازشی شامل: (1) کدینگ کانال BCH+LDPC، و (2) طیف گسترده‌ی دنباله مستقیم، ارتباط نرخ-بالا زیر طیف ماهواره برقرار می‌گردد. با چارچوب SC-based HRL، امکان انتقال داده با نرخ حداقل 1.25Mbps در شرایطی فراهم می‌شود که توان دریافتی 12dB پایین‌تر از سطح نویز است. در نتیجه لینک غیر قابل کشف بوده، در حالی که امکان انتقالِ برخط تصویر با کیفیت بالا فراهم می‌شود؛ و تاکنون چنین چارچوبی در مراجع پیشین ارائه نگردیده است. نتایج شبیه‌سازی SC-based HRL و پیاده‌سازی آن روی بورد FPGA Kintex7 410T تحلیل‌های ارائه شده را تأیید می‌کند.
کلیدواژه‌ها
لینک ماهواره‌ای نرخ-بالا
SC-based HRL
حذف‌کننده QRD-RLS
کدینگ BCH+LDPC
موضوعات

عنوان مقاله English

High-rate communication link under satellite channel spectrum using an SC-based HRL framework: QRD-RLS spectrum cancellation and BCH-LDPC-coded spread-spectrum data transmission

نویسندگان English

Hossein Akhlaghpasand 1
Akbar Chegini 2
S. Mohammad Sabbagh Jafari 3
1 Post-doc Student, School of Electrical and Computer Engineering, College of Engineering, University of Tehran, Tehran, Iran
2 B.Sc Graduate, Department of Electrical and Computer Engineering, University of Zanjan, Zanjan, Iran.
3 M.Sc Graduate, Department of Electrical and Computer Engineering, Shiraz University, Shiraz, Iran
چکیده English

In satellite communications, despite the high cost of bandwidth, the signal transmitted over the purchased bandwidth becomes accessible for everyone and is vulnerable with potentially malicious actions. To tackle this problem, two types of processing provide an undetectable high-rate communication link under the available satellite spectrum: Satellite spectrum cancellation and spread spectrum link. In this paper, a novel framework “spectrum cancellation-based high-rate link (SC-based HRL)” is proposed, in which the satellite spectrum as an interference signal is regenerated utilizing the QR-decomposition-recursive least square (QRD-RLS) algorithm and then cancelled from the received signal. After that, the high-rate data is received under the cancelled spectrum by exploiting a processing composed of: (1) the channel coding Bose, Chaudhuri, and Hocquenghem (BCH)+Low-Density Parity-Check (LDPC), (2) the direct sequence spread spectrum. Using the SC-based HRL, a data transmission rate of at least 1.25 Mbps can be achieved when the received power is 12 dB below the noise level. Consequently, the link remains undetectable while enabling online video transmission with acceptable quality. To the best of our knowledge, such a framework has not been presented in the previous references. Numerical results and implementation of the SC-based HRL on the FPGA Kintex7 410T confirm the proposed analyses.

کلیدواژه‌ها English

High-rate satellite link
SC-based HRL
QRD-RLS canceller
BCH+LDPC channel coding
[1] B. F. Beidas, H. E. Gamal, and S. Kay, “Iterative Interference Cancellation for High Spectral Efficiency Satellite Communications,” IEEE Transactions on Communications, vol. 50, no. 1, pp. 31-36, 2002.
[2] A. S. Karasuwa, J. Eastment, and I. Otung, “Performance Evaluation of Interference Mitigation for High Throughput Satellite Communication Systems,” in 21th Ka and Broadband Communications Conference, Bologna, Italy, 2015.
[3] A.-L. Johansson, and A. Svensson, “Analysis of Successive Interference Cancellation Scheme with M-array QAM in DS/CDMA Systems,” in NRS Seminar on Radio Communications Networks, Linköping, Sweden, 1994.
[4] P. Patel, and J. Holtzman, "Analysis of a Simple Successive Interference Cancellation Scheme in a DS/CDMA System," IEEE Journal on Selected Areas in Communications, vol. 12, no. 5, pp. 796-807, 1994.
[5] S. F. Yilmaz, C. Karamanlı and D. Gündüz, "Learning to Interfere in Non-Orthogonal Multiple-Access Joint Source-Channel Coding," IEEE Transactions on Wireless Communications, vol. 25, pp. 16859-16873, 2026.
[6] T. Van Luong, N. Shlezinger, C. Xu, T. M. Hoang, Y. C. Eldar and L. Hanzo, "Deep Learning Based Successive Interference Cancellation for the Non-Orthogonal Downlink," IEEE Transactions on Vehicular Technology, vol. 71, no. 11, pp. 11876-11888, 2022.
[7] M. Ghotbi, and M. R. Soleymani, “Multiuser Detection of DS-CDMA Signals Using Partial Parallel Interference Cancellation in Satellite Communications,” IEEE Journal on Selected Areas in Communications, vol. 22, no.3, pp. 584-593, 2004.
[8] M. Baianifar, and S. M. Razavizadeh, “Power Efficiency of Massive MIMO Relay Interference Channels,” Journal of Iranian Association of Electrical and Electronics Engineers, vol. 14, No. 2, pp. 11-22,  2017 (in Persian).
[9] J. Zeraatkarmoghadam, H. Farrokhi, and N. Neda, “Interference Management in Cognitive Radio Networks using Cooperative Beamforming with Imperfect CSI,” Journal of Iranian Association of Electrical and Electronics Engineers, vol. 14, No. 2, pp. 1-9,  2017 (in Persian).
[10] Z. Taheri, M. Ibrahim and M. R. Soleymani, “Non-Reciprocal RIS-Aided Self-Interference Cancellation in Full-Duplex Communications,” IEEE Internet of Things, To appear.
https://doi.org/10.1109/JIOT.2026.3722168
[11] H. Hong, K. K. Wong, H. Xu, Y. Wu, S. Xu, C. B. Chae, B. Liu and K. F. Tong, “Fluid Antenna System-Assisted Self-Interference Cancellation for In-Band Full Duplex Communications,” IEEE Transactions on Wireless Communications, vol. 25, pp. 7476-7489, 2025.
[12] L. Peng, and  L. F. Cajegas, “Fully Compensated Adaptive Interference Cancellation System,” U.S. Patent 8781030B2, 2014.
[13] M. Abbasi and M. R. Mosavi, “Reducing Interference Effect on GPS Navigation System Using Evolutionary Notch Filter,” Scientific Journal of Electronical & Cyber Defence, vol. 8, No. 4, pp. 95-106,  2021 (in Persian).
[14] M. Bayat, M. Moradi and J. Mazloum, “Analysis and Simulation of Adaptive Filters to Reduce Interference in Synthetic Aperture Radar and Providing a Hybrid Improved Algorithm,” Journal of Iranian Association of Electrical and Electronics Engineers, vol. 19, No. 3, pp. 37-46,  2022 (in Persian).
[15] H. Alizadeh, M. Babaei, and M. R. K Abadi, “Detection of Interfering Signals and Estimation of Their Carrier Frequency in CNC Satellite Communications using Cyclic Spectrum Density,” Scientific Journal of Electronical & Cyber Defence, vol. 11, No. 2, pp. 91-101,  2023 (in Persian).
[16] The Newtec Corporation, “BWC0900 Bandwidth Canceller,” ST Engineering iDirect, Florida, USA. Accessed Date: Dec. 2024 [Online]. Available: https://digisat.org/newtec-bwc0900-bandwidth-cancellation-system
[17] P. Monsen, and R.H. Cannon, “Method and Apparatus for Demodulation of a Desired Signal by Constellation-Independent Cancellation of Nonlinear-Distorted Interference,” U.S. Patent 9608718B2, 2017.
[18] S. M. J. Razavi, “The computation of co-site interference in crowded electromagnetic environments,” Journal of Applied Electromagnetics, vol. 10, No. 1, pp. 47-54,  2022 (in Persian).
[19] Handbook on Satellite Communications (HSC) – Appendix 9.3: C/I Calculation for Digital Carriers, ITU Standards, 2002.
[20] ETSI EN 300 421 v1.1.2 – Digital Video Broadcasting for 11/12 GHz Satellite Services (DVB-S), European Telecommunications Standards Institute, 1997.
[21] ETSI EN 302 307-1 v1.4.1 – Digital Video Broadcasting for Satellite Services-Second Generation (DVB-S2), European Telecommunications Standards Institute, 2014.
[22] ETSI EN 302 307-2 v1.1.1 – Digital Video Broadcasting for Satellite Services-Second Generation Extensions (DVB-S2X), European Telecommunications Standards Institute, 2014.
[23] ETSI EN 302 307-2 v1.2.1– Digital Video Broadcasting for Satellite Services-Second Generation Extensions (DVB-S2X) - Annex E: Beam Hopping Support, European Telecommunications Standards Institute, 2018.
[24] L. Laskov, “Convolutional Codes with Different Constraint Lengths and Their Application in DVB-S,” in International Conference on Telecommunications and Remote Sensing, Barcelona, Spain, 2018, pp. 21-26.
[25] V. A. Ong, and B. W. Welch, “Bit Error Rate and Frame Error Rate Data Processing for Space Communications and Navigation-Related Communication System Analysis Tools,” NASA/TM—2019-220070 Report, pp. 1-20, 2019.
[26] X. Ding, J. An, Z. Zhao, X. Bu, and K. Yang, "Low-Density Parity-Check Coded Direct Sequence Spread Spectrum Receiver Based on Analog Probabilistic Processing," IEEE Transactions on Vehicular Technology, vol. 70, no. 7, pp. 6355-6370, 2021.
[27] P. Savvopoulos, N. Papandreou, and Th. Antonakopoulos, “Architecture and DSP Implementation of a DVB-S2 Baseband Demodulator,” in 12th Euromicro Conference on Digital System Design/Architectures, Methods and Tools, Patras, Greece, 2009, pp. 441-448.
[28] M. Rice, “Digital Communications: A Discrete-Time Approach,” Upper Saddle River, NJ: Prentice Hall, 2009, pp. 359–393.
[29] S. Haykin, Adaptive Filter Theory, 5th edition Pearson Education: London, UK, 2014.
[30] J. A. Apolinário Jr., QRD-RLS Adaptive Filters, Springer Science+Business Media: New York, USA, 2009.
[31] G. Maral, M. Bousquet and Z. Sun, Satellite Communications Systems: Systems, Techniques and Technology, 6th edition John Wiley & Sons Ltd.: Chichester, UK, 2020.
دانش و فناوری هوافضا
دوره 15، شماره 1
شهریور 1405
صفحه 151-166