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Transmitter/Receiver of the proposed NC-OFDM-SPM-DPSK. Unlike conventional OFDM, the proposed technique employs two separate modulations where half the incoming bit stream is modulated by DPSK and the other half is modulated through the power level (i.e., high and low pattern).
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A promising candidate solution for reducing complexity in future wireless systems is the use of non-coherent designs; however, it is very well known in the literature that non-coherent schemes perform worse than their coherent counterparts. To address this longstanding challenging trade-off, we demonstrate and prove in this work the ability of the...
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... system model of NC-OFDM-SPM-DPSK is shown in Fig. 1. As shown in the transmitter depicted in Fig.1., the incoming data stream of length 2n bits is divided into two sub-streams of n bits which are modulated separately. One of the sub-streams consisting of n bits is modulated using the classical differential binary phase shift keying (DBPSK). The second sub-stream is modulated using ...
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... system model of NC-OFDM-SPM-DPSK is shown in Fig. 1. As shown in the transmitter depicted in Fig.1., the incoming data stream of length 2n bits is divided into two sub-streams of n bits which are modulated separately. One of the sub-streams consisting of n bits is modulated using the classical differential binary phase shift keying (DBPSK). ...
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... to the exploration of the high and low power pattern as an extra data-carrying dimension, the proposed scheme combines two streams; a stream of data modulated by DPSK (i.e., DP SK − st r eam) and another modulated by the power levels (i.e., Power − st r eam) as shown in Fig.1. As such, NC-OFDM-SPM-DPSK uses only half the number of subcarriers that conventional OFDM would require to send the same number of data bits. ...
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... shown in the system model of Fig.1, the receiver of NC-OFDM-SPM-DPSK uses two separate blocks for the detection of the transmitted symbols. ...
Context 5
... system model of NC-OFDM-SPM-DPSK is shown in Fig. 1. As shown in the transmitter depicted in Fig.1., the incoming data stream of length 2n bits is divided into two sub-streams of n bits which are modulated separately. One of the sub-streams consisting of n bits is modulated using the classical differential binary phase shift keying (DBPSK). The second sub-stream is modulated using ...
Context 6
... system model of NC-OFDM-SPM-DPSK is shown in Fig. 1. As shown in the transmitter depicted in Fig.1., the incoming data stream of length 2n bits is divided into two sub-streams of n bits which are modulated separately. One of the sub-streams consisting of n bits is modulated using the classical differential binary phase shift keying (DBPSK). ...
Context 7
... to the exploration of the high and low power pattern as an extra data-carrying dimension, the proposed scheme combines two streams; a stream of data modulated by DPSK (i.e., DP SK − st r eam) and another modulated by the power levels (i.e., Power − st r eam) as shown in Fig.1. As such, NC-OFDM-SPM-DPSK uses only half the number of subcarriers that conventional OFDM would require to send the same number of data bits. ...
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Citations
... It is known in the literature that coherent systems surpass non-coherent systems in terms of reliability; however, noncoherent schemes are less complex in terms of receiver design because of the absence of phase estimation [11]- [14]. In Fig.6, OFDM-SPM-DPSK is compared with coherent and noncoherent binary phase shift keying modulations in terms of complexity and reliability. ...
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... Hamamreh and Abewa [13], [14] used the OFDM-SPM with non-coherent modulation to meet the requirements of IoT applications and make a trade-off between coherent and non-coherent modulation. On the negative side of this scheme, it suffers from a high BER. ...
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... Overall, the design is much simpler at the receiver where very simple operations are used (BPSK, Power / thresholdbased detection) unlike many multi-dimensional OFDM techniques such as subcarrier number (OFDM-SNM), subcarrier index (OFDM-IM, SIM-OFDM) which usually employ either a maximum likelihood (ML) detector for optimum performance or a log-likelihood ratio (LLR) detector for reduced complexity [17]. ...
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... 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. In [23], the author demonstrates and proves in this work the ability of the proposed two-dimensional modulation scheme termed as non-coherent orthogonal frequency division multiplexing with subcarrier power modulation and differential phase-shift keying in achieving the performance of a coherent design while reducing complexity. In [24] the results of OFDM-SPM with QPSK were compared to that of conventional OFDM with 16-QAM symbol modulation. ...
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) setup 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.
The simulation codes of this paper can be found at this link https://researcherstore.com/product/matlab-simulation-codes-of-stbc-for-ofdm-spm/
A modulation technique has recently developed known as “OFDM with Subcarrier Power Modulation (OFDM-SPM)”. This technique utilizes two types of modulation. The first one called power modulation, where the power level of each subcarrier changes depending on the bit stream while transmit uses another type of conventional modulation such as a QPSK. The results shows that the adoption of OFDM with SPM improve the throughput, save the power, reduce the complexity, and so on. On the negative side, it shows degradation in the “Bit Error Rate” (BER) performance. In this paper, the convolutional code is the proposed to improve the BER while paired with the vitribi hard decision decoder which is considered easy to implement of the hardware and costs. the suggested methods will be discussed in the terms of throughput and BER with the three power reallocation policies ) PRPs).
