Software radio technology is expected to play an important role in the development of Fourth Generation (4G) wireless communication systems. The signal identification process, an intermediate step between signal interception and demodulation, is a major task of an intelligent receiver. Automatic Modulation Classification (AMC) is the process of deciding, based on observations of the received si...

It is shown that a non-square (NS) 2-ary quadrature amplitude modulation (QAM) can be decomposed into a single-parity-check (SPC) block encoder and a memoryless modulator with independent in-phase (I) and quadrature (Q) symbol mapping. When NS-2-QAM is concatenated with a forward-errorcorrecting (FEC) code, iterative demodulation and decoding of the FEC code and the inherent SPC code of NS-2-QA...

In α-μ fading environment utilizing Quadrature Amplitude Modulation (QAM) schemes, the Average Symbol Error Rate (ASER) is analyzed for a Single Input And Output (SISO) communication system. QAM schemes enhance bandwidth efficiency 5G and beyond wireless transmission systems. The closed-form expressions ASER of Hexagonal (HQAM), Cross (XQAM), Square (SQAM), as well Rectangular (RQAM) are presen...

Quadrature amplitude modulation (QAM) is one of the essential components unmanned 1 aerial vehicle (UAV) communications. However, output signal accuracy QAM deteriorates dramatically and even collapses in case UAVs a harsh channel environment. This due to fractionally spaced equalization based on multi-modulus blind algorithm being implemented prior carrier synchronization QAM-based UAV systems...

Low-Jitter Symbol Timing Recovery for M-ary QAM and PAM Signals

Virtually all telecom providers need to upgrade their networks cost-efficiently to accommodate the ever-increasing data traffic. Particular effort is being undertaken to upgrade these existing optical wavelength division multiplex transmission systems with a channel spacing of 50 GHz and a channel data rate of 10 Gb/s to a channel data rate of >100 Gb/s, while at the same time achieving superio...

In Internet data transmission, the throughput of 45 Mbps is achieved. Now the goal is to increase the data rate further to 100 Mbps and beyond. We designed a Frequency Division Multiple Access system for that and realized it using Q-Dot technology. The principal reason for coherent demodulation in LAN is the size of PLL in QDot circuit. It also allows higher capacity than 1⁄2 achieved so far. 1...

An underwater universal filtered multicarrier (UFMC)-based voice transmission scheme is proposed using a 512-point inverse discrete Fourier transform, utilizing 10 sub-bands, and that each had 20 subcarriers. In this UFMC method, the adaptive modulation technologies with 4 quadrature amplitude (QAM), 16-QAM, low-density parity-check (LDPC) channel coding were integrated. Additionally, bit error...

Real-time 10,000 km transmission over a straight-line link is achieved using software-defined multi-modulation format receiver implemented on commercial off-the-shelf general-purpose graphics processing unit (GPU). Minimum phase 1 GBaud (QAM) signals are transmitted and successfully received after detection with Kramers-Kronig (KK) coherent receiver. 8-, 16-, 32-, 64-QAM 7600, 5600, 3600, 1600 ...