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Signal Space Diversity for Improving the Reliability Performance of OFDM with Subcarrier Power Modulation

Signal space diversity (SSD) along with coordinate interleaving is proposed in this work to be integrated with OFDM‐SPM to help improve the overall BER performance, thus resulting in a performance improvement of more than 5 dB compared to conventional OFDM-SPM without SSD.

Published onApr 05, 2021
Signal Space Diversity for Improving the Reliability Performance of OFDM with Subcarrier Power Modulation


As the demand for higher data rates continues to increase exponentially, there is a shift towards exploring contemporary techniques that are likely to offer higher spectral efficiency. A new modulation technique termed as orthogonal frequency division multiplexing with sub‐carrier power modulation (OFDM‐SPM) has recently been introduced. It is an original technique that is still largely under-explored and aims at transmitting more bits per sub‐carrier by manipulating the power of the sub‐carriers in an OFDM block, in addition to those bits that are usually transmitted by conventional modulation schemes such as M-PSK. During the investigation and theoretical testing stages, it was found that the additional data stream conveyed by subcarriers' power has higher bit error rate (BER) performance compared to the data stream conveyed by conventional modulation schemes. To overcome this shortfall, signal space diversity (SSD) along with coordinate interleaving is proposed in this work to be integrated with OFDM‐SPM to help improve the overall BER performance. By doing so, it is shown that a BER performance of 10-3 can be obtained at SNR of 15 dB, which means achieving an improvement of more than 5 dB compared to the case of using OFDM‐SPM without SSD. Furthermore, the performance results of OFDM‐SPM‐SSD is compared with those of OFDM‐SPM with maximal ratio combining (MRC) and the obtained results show that OFDM‐SPM‐SSD offers superior performance. Additionally, a study of the effect of the constellation rotation on OFDM‐SPM is provided and an in‐depth analysis is also carried out for different power polices of sub‐carrier power modulation with regards to two main performance metrics; namely BER and the throughput. Simulation results show that SSD provides a considerable improvement in the BER over both plain OFDM‐SPM and OFDM‐SPM‐MRC. The analysis also reveal that when considering the different power policies of SPM, the BER results are optimum in the case of using power‐reassignment policy.

INDEX TERMS: OFDM-SPM, SSD, MRC, SNR, BER, OFDM, Adaptive Modulation, Rayleigh Fading, Receive Diversity, Signal Space Diversity.


[1] A. Jaradat, J. M. Hamamreh, H. Arslan, “Modulation Options for OFDM-Based Waveforms: Classification, Comparison, and Future Directions,”IEEE Access, 7(1), 17263-17278, Feb. 2019.

[2] A. M. Jaradat, J. M. Hamamreh and H. Arslan, "OFDM With Hybrid Number and Index Modulation," in IEEE Access, vol. 8, pp. 55042-55053,2020.

[3] J. M. Hamamreh, Z. E. Ankarali, and H. Arslan, “CP-Less OFDM with Alignment Signals for Enhancing Spectral Efficiency, Reducing Latency, and Improving PHY Security of 5G and Beyond Services,” in IEEE Access, vol. 6, pp. 63649-63663, 2018.

[4] J. M. Hamamreh, E. Basar, and H. Arslan, “OFDM-subcarrier index selection for enhancing security and reliability of 5G URLLC services,”IEEE Access, vol. 5, pp. 25 863–25 875, 2017.

[5] E. Basar, “OFDM With Index Modulation Using Coordinate Interleaving,”in IEEE Wireless Communications Letters, vol. 4, no. 4, pp. 381-384, Aug.2015, doi: 10.1109/LWC.2015.2423282.

[6] A. Hajar, J. M. Hamamreh, M. Abewa and Y. Belallou, "A Spectrally Efficient OFDM-Based Modulation Scheme for Future Wireless Systems,"2019 Scientific Meeting on Electrical-Electronics Biomedical Engineering and Computer Science (EBBT), Istanbul, Turkey, 2019, pp. 1-4, doi:10.1109/EBBT.2019.8742049.

[7] Y. Belallou, J. M. Hamamreh and A. Hajar, “OFDM-Subcarrier Power Modulation with two-dimensional signal constellations,” 2019 Innova-tions in Intelligent Systems and Applications Conference (ASYU), Izmir, Turkey, 2019, pp. 1-6, doi: 10.1109/ASYU48272.2019.8946346.

[8] Abewa, M., Hamamreh, J. M. (2020). Non-coherent OFDM-Subcarrier Power Modulation for Low Complexity and High Throughput IoT Ap-plications. RS Open Journal on Innovative Communication Technologies.

[9] Hajar, A., Hamamreh, J. M. (2020). The Generalization of Orthogonal Frequency Division Multiplexing With Subcarrier Power Modulation to Quadrature Signal Constellations. RS Open Journal on Innovative Communication Technologies, 1(1), 2020. doi: 10.21428/03d8ffbd.4948e89e

[10] J. M. Hamamreh, Abdulwahab Hajar, and Mohamedou Abewa, "Orthogonal Frequency Division Multiplexing With Subcarrier Power Modulation for Doubling the Spectral Efficiency of 6G and Beyond Networks." in Transactions on Emerging Telecommunications Technologies, 2020. doi: 10.1002/ett.3921

[11] H. C. Mora, N. Orozco Garzón, F. A. García and C. de Almeida, “On the Bit Error Rate of OFDMA Employing Short Cyclic Prefix and Maximal Ratio Combining,” 2019 IEEE Colombian Conference on Communications and Computing (COLCOM), Barranquilla, Colombia, 2019, pp. 1-6, doi: 10.1109/ColComCon.2019.8809120.

[12] Bo-Seok Seo and Seong-Gon Choi, “Maximum ratio combining for OFDM systems with cochannel interference,” 2006 Digest of Technical Papers International Conference on Consumer Electronics, Las Vegas, NV,2006, pp. 365-366, doi: 10.1109/ICCE.2006.1598462.

[13] S. Nandi, A. Nandi and N. N. Pathak, “Performance analysis of Alamouti STBC MIMO OFDM for different transceiver system,” 2017 International Conference on Intelligent Sustainable Systems (ICISS), Palladam, 2017,pp. 883-887, doi: 10.1109/ISS1.2017.8389305.

[14] J. Boutros and E. Viterbo, “Signal space diversity: a power- and bandwidth-efficient diversity technique for the Rayleigh fading channel,”in IEEE Transactions on Information Theory, vol. 44, no. 4, pp. 1453-1467,July 1998, doi: 10.1109/18.681321.

[15] S. Özyurt and O. Kucur, “Performance of OFDM With Signal Space Diversity Using Subcarrier Coordinate Interleaving,” in IEEE Transactions on Vehicular Technology, vol. 67, no. 10, pp. 10134-10138, Oct. 2018, doi:10.1109/TVT.2018.2864645.

[16] J. C. Inácio, B. F. Uchôa-Filho and D. Le Ruyet, “Exploiting Signal Space Diversity in OFDM With Grouped Subcarriers: Going Beyond Subcarrier Index Modulation,” in IEEE Wireless Communications Letters, vol. 7, no.4, pp. 650-653, Aug. 2018, doi: 10.1109/LWC.2018.2807446.

[17] C. I. Frison, H. C. Mora, C. Almeida, “Optimum rotation parameters for single and multiuser signal space diversity employing spatial diversity,”AEU - International Journal of Electronics and Communications, vol. 107,pp. 275-281, 2019, doi: 10.1016/j.aeue.2019.05.032.

[18] N. F. Kiyani, J. H. Weber, A. G. Zajic and G. L. Stuber, “Performance Analysis of a System using Coordinate Interleaving and Con-stellation Rotation in Rayleigh Fading Channels,” 2008 IEEE 68thVehicular Technology Conference, Calgary, BC, 2008, pp. 1-5, doi:10.1109/VETECF.2008.219.

[19] Lemayian, J. P., Hamamreh, J. M. (2020). A Novel Small-Scale Nonorthogonal Communication Technique Using Auxiliary Signal Super-position with Enhanced Security for Future Wireless Networks. RS OpenJournal on Innovative Communication Technologies.

[20] H. M. Furqan, J. M. Hamamreh, and H. Arslan, “Adaptive OFDM-IM for Enhancing Physical Layer Security and Spectral Efficiency of Future Wireless Networks,” Wireless Communications and Mobile Computing by Hindawi and Wiley, vol. 2018, Article ID 3178303, 16 pages, 2018. doi: 10.1155/2018/3178303

[21] J. M. Hamamreh, and A. Hajar, “The Generalization of Orthogonal Frequency Division Multiplexing with Subcarrier Power Modulation to Quadrature Signal Constellations”, RS Open Journal on Innovative Com-munication Technologies, 2020, doi: 10.21428/03d8ffbd.4948e89e.

[22] P. Zetterberg, M. L. Nordenvaad and B. Nilsson, “Synchronization of OFDM with null subcarriers in channels with significant ICI,” OCEANS 2017 - Aberdeen, Aberdeen, 2017, pp. 1-5, doi:10.1109/OCEANSE.2017.8084727.

[23] J. P. Singh and S. Singh, “Implementation of OFDM and other multicarrier modulations on SDR,” 2016 IEEE International Conference on Signal Processing, Communication, Power and Embedded System (SCOPES),Paralakhemundi, India, 2016, pp. 1937-1940.

[24] A. M. S. Abdelgader, L. Wu, “Design of a Multi-order Frequency Diversity Approach,” Mathematical Problems in Engineering, Hindawi, Vol. 2015,doi: 10.1155/2015/291625.

[25] Xiaolong Zhu and Jinyin Xue, “On the Correlation of Subcarriers in Grouped Linear Constellation Precoding OFDM Systems Over Frequency Selective Fading,” 2006 IEEE 63rd Vehicular Technology Conference, Melbourne, Vic., 2006, pp. 1431-1435, doi:10.1109/VETECS.2006.1683071.

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