NC-OFDM-SPM: A Two-Dimensional Non-Coherent Modulation Scheme for Achieving the Coherent Performance of OFDM along with Sending an Additional Data-stream (original) (raw)
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2020
A novel modulation technique termed as orthogonal frequency division multiplexing with subcarrier power modulation (OFDM-SPM) has been proposed for achieving spectral-efficient data transmission in wireless communication systems. OFDM-SPM utilizes the power of each subcarrier in an OFDM block as an extra degree of freedom to convey extra information bits besides the bits transmitted by conventional signal modulation. OFDM-SPM has originally been introduced with binary phase shift keying (BPSK) symbol modulation, and was shown to provide great gains and various merits such as doubling the spectral efficiency, reducing transmission power and transmission times by half. Displaying its capabilities as a scheme to be adopted for future wireless communication systems, a question detrimental to the adoption of OFDM-SPM has yet to be answered. This is whether the gains that OFDM-SPM brings persist when paired with higher order modulation schemes, especially two dimensional signal constellat...
2020
Aiming to reduce the transceiver complexity and power consumption of communication systems dedicated to serving future Internet of Things (IoT) applications, researchers have taken many approaches with varying degrees of success. A promising candidate solution that can reduce complexity significantly and thus also enhance power-saving is the use of non-coherent modulation-based schemes. Utilizing a non-coherent structure rids the system of any dependency on the knowledge of the phase of the transmitted signal during demodulation. However, although most of the available non-coherent techniques in the literature reduce the complexity of the system, they, unfortunately, suffer from a drawback of some sort, especially in reducing the overall spectral efficiency of the system. To address this problem, we propose a new non-coherent modulation scheme called orthogonal frequency division multiplexing with subcarrier power modulation and differential phase-shift keying (OFDM-SPM-DPSK), as an...
Orthogonal Frequency Division Multiplexing With Subcarrier Gap Modulation
2021
A new modulation scheme called orthogonal frequency division multiplexing with subcarrier gap modulation (OFDM-SGM) is proposed. The proposed scheme embeds extra information bits by exploiting the gap between the active subcarriers in each subblock. The proposed scheme differs from the OFDM-index modulation (OFDM-IM), in which information bits are transmitted using the index of active subcarriers. This OFDM-SGM technique provides superior spectral and energy efficiencies compared to the OFDM-IM, particularly when using binary phase-shift keying (BPSK)-like low constellation schemes, that suit the Internet of Things (IoT) applications that have low complexity. The theoretical error performance of the proposed scheme is presented, and the consistency between the theoretically derived error performance and the simulated one is also provided.
A STUDY ON ENHANCING THE OFDM SCHEMES IN WIRELESS COMMUNICATION
IAEME PUBLICATION, 2019
This paper presents enhancing the OFDM schemes in wireless communication techniques for ultra-low power (ULP) devices. The concept of embedded back-channel communication is proposed to enable a variety of new applications by interconnecting heterogeneous ULP devices through existing Orthogonal Frequency Division Multiplexing (OFDM) based Wi-Fi (IEEE 02.11a/g/n/ac) networks. The proposed back-channel communication allows ULP devices to decode messages embedded in Wi-Fi OFDM packets even if these ULP devices are incapable of demodulating OFDM. The proposed back-channel signaling has unique properties that are easily detectable by non-Wi-Fi ULP receivers consuming sub-mW of active power. The proposed scheme eliminates the need for specialized transmitter hardware or dedicated channel resources for embedded back-channel signal transmission. Instead, carefully sequenced data bit streams will generate back-channel messages from already-deployed Wi-Fi infrastructure without any hardware Modification. This paper demonstrates that Wi-Fi OFDM back-channel communication is feasible in various modulation formats such as pulse position modulation (PPM), pulse phase shift keying (PPSK), or frequency shift keying (FSK). Systematic algorithms are unveiled to create back-channel messages in various modulation formats from a WiFi standard compliant Datapath. Comprehensive bit error rate (BER) performance analysis of various Wi-Fi back-channel communication schemes is derived and validated in realistic multi-path frequency selective fading channels. so the most important aspect of this proposed work is latency and energy consumption so ULP is efficiently implemented in order to provide the optimize and efficient OFDM schemes in wireless communication.
International Journal of Engineering Research and Technology (IJERT), 2013
https://www.ijert.org/performance-analysis-of-ofdm-system-using-dpsk-modulation-technique-with-different-multipath-fading-channels https://www.ijert.org/research/performance-analysis-of-ofdm-system-using-dpsk-modulation-technique-with-different-multipath-fading-channels-IJERTV2IS110956.pdf As we know that high data rate is necessity of the modern technology. One of the modern modulation technique called OFDM (orthogonal frequency division multiplexing) can fulfill the requirement because of its advancement and multicarrier with orthogonality. we get the better results compare to other modulation techniques. Here, In this paper we discuss the performance analysis of the OFDM system with multipath fading channel like Rayleigh and we will use the AWGN channel as a reference channel. We will use the DPSK(Differential Phase Shift Keying) modulation technique for the implementation of the OFDM system and also comparative analysis. Index Terms: AWGN(Additive White
Performance analysis of coded MIMO OFDM with subcarrier power modulation
The Indonesian Journal of Electrical Engineering and Computer Science (IJEECS), 2023
This study investigates a new technique known as orthogonal frequency division multiplexing with subcarrier power modulation (OFDM-SPM) when compounded with a multiple-input multiple-output (MIMO) system. This combination of the two wireless technologies offers additional benefits and characteristics, such as increased spectrum efficiency (SE), increased energy efficiency (EE), and decreased transmission latency, among others. However, as compared to a traditional MIMO-OFDM system, the system's bit error rate (BER) show degradation. In this paper, turbo code is proposed as a coding technique to enhance the system performance with three-power reallocation policies (PRPs). The simulation results show that the BER and throughput performance has gotten better, where the throughput is doubled and the BER achieves about 10 dB gain by utilizing the proposed methods and compare to the classical MIMO OFDM, which makes the system more suitable for use in future wireless systems.
IJERT-BER Analysis with OFDM using PSK/QAM Techniques for Wireless Communication
International Journal of Engineering Research and Technology (IJERT), 2014
https://www.ijert.org/ber-analysis-with-ofdm-using-pskqam-techniques-for-wireless-communication https://www.ijert.org/research/ber-analysis-with-ofdm-using-pskqam-techniques-for-wireless-communication-IJERTV1IS7464.pdf Orthogonal frequency division multiplexing (OFDM) now a day is becoming the chosen modulation technique for wireless communication networks. It is only because it can provide large data rates and is sufficiently robust in the face of radio channel impairments. Digital modulation techniques provide sufficient evolution of our mobile wireless communications by increasing the capacity, speed and quality of a wireless networks. In this paper, We concentrate on digital modulation schemes, such as PSK (Phase Shift keying) and QAM (Quadrature Amplitude Modulation) over an additive white Gaussian Noise (AWGN) channel to analyze the performance of an OFDM system in terms of bit error rate (BER). This is evaluated through a computer simulation, the results from which make it clear that, for high-capacity data rate transmission, the QAM modulation is better than the PSK modulation.