OFDM-Subcarrier Power Modulation With Two Dimensional Signal Constellations

Belallou, Youcef; Hamamreh, Jehad M.; Hajar, Abdulwahab

doi:10.1109/asyu48272.2019.8946346

Cited by 7 publications

(2 citation statements)

References 13 publications

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“…In addition, in [6] the concept of OFDM-SPM is extended to the case of using two-dimensional signal constellations that consist of both in-phase and quadrature components such as QPSK Symbol modulation. Moreover, in [7] the results show that compared to other proposed modulation techniques, which add a third dimension to carry data, OFDM-SPM vastly improves spectral efficiency, where it is capable of doubling the spectral efficiency in addition to reducing the transmission power of the system by half.…”

Section: Introductionmentioning

confidence: 99%

STBC-assisted OFDM with Subcarrier Power Modulation

Abuqamar

Hamamreh

Abewa

2021

RS Open Journal on Innovative Communication Technologies

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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.

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Section: Introductionmentioning

confidence: 99%

STBC-assisted OFDM with Subcarrier Power Modulation

Abuqamar

Hamamreh

Abewa

2021

RS Open Journal on Innovative Communication Technologies

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“…To overcome the spectral efficiency issue, researchers have come up with different modulation techniques paired with OFDM, such as OFDM with index modulation (OFDM-IM) [17], OFDM with subcarrier power modulation (OFDM-VOLUME 2, 2021 SPM) [18], [19], and OFDM with subcarrier number modulation (OFDM-SNM) [20].…”

Section: Introductionmentioning

confidence: 99%

Multi-User Subcarrier Number Modulation-based OFDM for Future Wireless Communication Networks

Kirik

Hamamreh

2021

RS Open Journal on Innovative Communication Technologies

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Orthogonal Frequency Division Multiplexing with Subcarrier Number Modulation (OFDM-SNM) has recently been proposed as an effective transmission method that can transmit additional data bits by exploiting the number of subcarriers in each subblock. This results in an improved performance in terms of spectral efficiency and reliability. However, one of the main drawbacks of OFDM-SNM is that not all the available subcarriers are deployed to transmit data, as some of these subcarriers remain inactive. In order to eliminate this problem and make use of all the available subcarriers, Multi-User OFDM-SNM is proposed in this paper for serving multiple users by dedicating the subcarriers used for implementing SNM to serve a far user, whereas the remaining subcarriers are used to send data for a near user. In this paper, the concept of multi-user OFDM-SNM is established on the basis of conventional OFDM over a Rayleigh fading channel. The validity of the system is proven by exhibiting both theoretical analysis and computer simulations. The obtained results show that the proposed multi-user OFDM-SNM is a strong candidate for the future 6G and beyond technologies and it can satisfy the requirements of multi-user cases of future wireless systems demanding higher reliability and better spectral efficiency.

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Double the data rate in underwater acoustic communication using OFDM based on subcarrier power modulation

Alraie,

Alahmad,

Ishii

2024

J Mar Sci Technol

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Underwater communication is one of the most important and difficult challenges facing researchers due to the high attenuation of the signal, communication with the surface because of the harsh medium of water, and data transmission performance degradation as a result of various effects. Underwater acoustic communication (UWA) has a low data rate, which describes the disadvantage of this type of communication. In addition, it has a low bandwidth range and high latency but has a long transmission range as an advantage. Multicarrier wireless transmission systems increase the data rate by sending the data using more than one carrier. We proposed a noncoherent orthogonal frequency division multiplexing (OFDM) method to increase the data rate in UWA communication systems. In addition, doubling the data rate in the OFDM using Subcarrier Power Modulation (OFDM-SPM) system can save half of the bandwidth. The MATLAB simulation program was used to implement the system in the underwater acoustic environment to increase its throughput. The proposed design uses Differential Phase Shift Keying (DPSK) with power control, and the data stream is transmitted through two-dimensional modulation schemes, the DPSK, and the power level of each subcarrier in the OFDM system with cyclic prefix (CP). The underwater channel was designed using a Rician fading multipath with a spreading loss formula as a function of distance and frequency. We designed an equalizer at the receiver side to recover the original signal as a function of three parameters which are: the channel effect as a rate between transmitting and receiving symbols, the Rician channel response, and the UWA spreading loss. OFDM-Subcarrier Power Modulation (OFDM-SPM) using the proposed equalizer performed better than the theoretical OFDM-SPM in the Rayleigh channel. The designed equalizer increased the performance of the OFDM-SPM system by 25% which helped to enhance the system’s throughput and doubled the data rate compared with the OFDM system, doubling the data rate using OFDM-SPM had been validated in laboratory experiments in the Time domain.

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OFDM-Subcarrier Power Modulation With Two Dimensional Signal Constellations

Cited by 7 publications

References 13 publications

STBC-assisted OFDM with Subcarrier Power Modulation

STBC-assisted OFDM with Subcarrier Power Modulation

Multi-User Subcarrier Number Modulation-based OFDM for Future Wireless Communication Networks

Double the data rate in underwater acoustic communication using OFDM based on subcarrier power modulation

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