STBC-assisted OFDM with Subcarrier Power Modulation

Abstract

Orthogonal Frequency Division Multiplexing with Subcarrier-Power Modulation (OFDM-SPM) has recently been proposed as a promising, potential transmission technique for future wireless communications (i.e., 6G and beyond) due to its multiple beneficial characteristics, including higher spectral efficiency, low latency with good reliability while maintaining low complexity. In this paper, the OFDM-SPM technique is compounded with Alamouti space-time block coding (STBC) in a multiple-input-single-output (MISO) set up to study, investigate and quantify the wireless system's performance of their combination over a multipath Rayleigh fading channel. Particularly, we analyze the two main performance metrics, bit-error-rate (BER) and throughput of the newly designed technique called OFDM-SPM-STBC, and then quantify the amount of gains in both BER and throughput. For making STBC work well with OFDM-SPM, a suitable equalizer is proposed for detecting the SPM power bits, and it is observed that there is a considerable improvement in the BER performance. We also consider two scenarios for OFDM-SPM-STBC transmission. The first one is the power reassignment policy (PRP), and the second one is the power saving policy (PSP). It is found that the sub-carrier optimized power-reassignment scheme provides the best BER performance for the proposed transmission scheme. In contrast, the PSP for SPM provided an intermediate improvement in an average BER.

Integration of Hybrid Networks, AI, Ultra Massive-MIMO, THz Frequency, and FBMC Modulation Toward 6G Requirements: A Review

“…Besides, CP OFDM has many drawbacks, including high OOBE, as well as orthogonality, which necessitates precise time and frequency synchronization to prevent timing and frequency offsets, which can result in inter-carrier Interference (ICI) [57], and high PAPR, which dismiss the conventional OFDM to be a candidate for a future generation [55], [58]. Researchers have attempted to reduce these drawbacks and enhance the performance of OFDM to be deployed in 6G [59]- [62]. Many research suggested new waveforms, including filtered OFDM (F-OFDM), Generalized Frequency Division Multiplexing (GFDM), Filter-Bank Multicarrier (FBMC), and Universal Filtered Multicarrier (UFMC) to address current and upcoming wireless issues and address the shortcomings of OFDM.…”

“…Filter-Bank Multicarrier (FBMC): It is the waveform candidates that are best suited for use in wireless communications in the future. To overcome the drawbacks of the multicarrier approach, Saltzberg and Chang proposed FBMC in 1971 [72], [62]. Since it is an OFDM advancement [72], FBMC inherits most of the OFDM features.…”

Millimeter-wave channel modeling in a VANETs using coding techniques

“…In Abuqamar, Hamamreh & Abewa (2021) STBC was combined with Orthogonal Frequency Division Multiplexing with Sub carrier-Power Modulation (OFDM-SPM) to analyze combination on a multi-path Rayleigh fading channel. BER and throughput were used as a performance metrics.…”

Performance analysis of coded MIMO OFDM with subcarrier power modulation

“…Hijazi and Hamamreh [15] suggested signal space diversity as a solution to enhance the system performance through the Rayleigh fading channel where they achieve a gain of more than 5 dB. Abuqamar et al [16] suggested using Alamouti space-time block coding in a multiple-input-single-output over a multipath Rayleigh fading channel to enhance the throughput and BER performance.…”