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We consider a single-input-single-output (SISO) system with quadrature phase shift keying (QPSK) modulation and derive an easy-to-evaluate expression for the symbol error probability (SEP) when a general n-bit phase quantization is used at the receiver. We further evaluate the expressions asymptotically to characterize the diversity order and the quantization penalty at high signal-to-noise ratios...
In this paper, the influence of disturbance light on visible light communication was investigated. A transmitter and a receiver of 4 pulse position modulation (4PPM) and π/4 differentially coherent quadrature phase-shift keying (π/4 DCQPSK) were fabricated and the bit error rates of the two modulation schemes were compared. This time, an incandescent bulb with a power consumption of 100 W was used...
This paper reflects the results of developed sync system investigation, which is based on optimal receiver by average risk minimum criterion. This receiver is intended to detect the reflected radar impulse under conditions of Gaussian and Johnson noises. During a digital experiment we used M-sequence with single pulse phase-shift keying as a reference signal. The use of a developed self-tuning system...
A fully-electronic high-speed transmission with a highly-integrated set of quadrature direct-conversion TX and RX modules in 130nm SiGe HBT technology operating in the 240 GHz transmission window is presented. In view of high packaging costs of the currently available THz communication front-ends, each of the modules is implemented as a single chip with a broadband silicon lens-integrated on-chip...
Reconfigurable terminals capable of adapting their transmission parameters such as modulation scheme, data and coding rates are desired to enhance the quality of service along with energy and spectral efficiency. However, spectrum bandwidth and time delay constraints limit the explicit sharing of these parameters and hence, they need to be estimated blindly. Though significant work has been done in...
Machine type communication (MTC) is a typical scenario in 5G communication systems, and massive machine type communication (MMTC) is a main type of MTC. One prominent characteristic of MMTC is massive connections and sporadic transmission with short packets. To embrace the new challenge in 5G emerging scenarios, flexible filterbased waveforms have been widely studied recently. In this paper, we evaluate...
We use the photomixing technique to generate a continuous-wave signal in the EHF (Extremely High Frequency) band and modulate it with a Vector Signal Generator (VSG) programmed with E-TM 1.1 (E-UTRAN Test Model) standard in Quadrature Phase-Shift Keying (QPSK). To receive the EHF signal, we use a Schottky diode receiver which is in turn connected to a Vector Signal Analyzer (VSA) which determines...
Orthogonal frequency division multiplexing (OFDM) is an attractive technique to realize high date rate in light emitting diodes (LEDs)-based visible light communication (VLC). However, high peak-to-average power ratio (PAPR) of OFDM makes VLC-OFDM very sensitive to nonlinearity of LEDs. In this paper, discrete Fourier transform-spread (DFT-Spread) combined with clipping method is proposed to reduce...
In the Stokes vector direct detection (SV-DD) system, we extend a previously-proposed simple blind polarization demultiplexing (POL-DEMUX) algorithm for PSK constellations to QAM constellations. We numerically analyze the POL-DEMUX performance and confirm that the blind POL-DEMUX process can be successfully done with negligible power penalties for high-order modulation formats such as 8-PSK, 16-PSK...
We propose a novel carrier phase estimation method for the high-speed coherent WDM PON based on the reflective semiconductor optical amplifier (RSOA). By using this method, we can utilize a cost-effective DFB laser as the seed light in such a network due to its fast trackability. We experimentally achieve an excellent receiver sensitivity of −30.8 dBm even when a DFB laser (linewidth: 3 MHz) is used...
We propose the use of differential code shift keying (DCSK) for a symbol rate adaptive low-complexity DSP algorithm by eliminating adaptive-equalizer (AEQ) with limited influence on circuit size. As a proof of concept, a 300km transmission using DCSK format was demonstrated without using AEQ.
In this paper, Hybrid PSK-MPPM is proposed to improve the system performance of the conventional ACO-OFDM by modulating the subcarriers with less number of high power PSK modulated symbols while their positions will also be utilized to carry additional information. At the receiver, the position of the modulated subcarriers will be firstly identified on each sub-frame by selecting the subcarriers with...
The IEEE 802.22 system was standardized in 2011 as a fixed wireless communication system for regional area networks using TV white-spaces (TVWS). Due to its wide coverage area of 10–30 km, the IEEE 802.22 system is expected as a backbone wireless network system in developing countries as well as a public safety broadband communication system even in leading countries. This wide coverage enables a...
A new family of low density parity-check (LDPC) codes, called as invertible subset LDPC (IS-LDPC) codes, was proposed for peak-to-average power ratio (PAPR) reduction in OFDM systems recently. In this paper, we propose a PAPR reduction scheme for orthogonal frequency-division multiple access (OFDMA) systems based on IS-LDPC codes. The proposed scheme maps the invertible subsets of IS-LDPC codewords...
This paper describes the design and implementation of an End-to-End digital wireless communication system (E2E) system on the Zynq-7000 Field Programmable Gate Array (FPGA) and Evaluation Development (Zed) Board with an Analog Devices AD9364 Wideband Transceiver from a model-based design system. Furthermore, the paper presents the design path to reconfigure the software controlled logic blocks for...
We introduce π/2-shifted Phase Shift Keying on the Hypersphere (π/2-PSKH), a new modulation scheme for Multiple-Input Multiple-Output (mIMO) systems. π/2-PSKH is a multidimensional extension of shifted QAM which allows to use load-modulated MIMO transmitters with a highly efficient power amplifier with reduced backoff. We propose π/2-PSKH constellations and explain how a π/2-PSKH signal is generated...
In an energy-efficient receiver employing iterative decoders, phase synchronization errors reduce much of the gains that can be achieved at low SNRs. To address this problem, the concept of an iterative receiver has received much attention in the past. In such a framework, signal degradation at low SNR is overcome by repeated phase synchronization executed over the soft symbols generated by the iterative...
This paper investigates the impact of phase errors of beamforming networks on the performance of distributed transmit beamforming systems. Through multi-tone signal, wider band, models and the defined phase error percentage (PEP) of the beamforming networks, the distorted signal waveforms for different wider band occupying beamforming systems are presented. Furthermore, simulated bit error rates (BERs)...
The paper reviews our recent experimental work in the area of multi-Gigabit fixed wireless links operating in the high millimeterwave frequency range. An E-band link is employed to transmit up to 6 Gbit/s over a line-of-sight terrestrial distance of 36.7 km using QPSK modulation, and 15 Gbit/s over 15 km using 8QAM. At 240 GHz, up to 64 Gbit/s QPSK are transmitted over a distance of 850 m. The paper...
In this paper the different digital phase-locked loop based structures and techniques to implement carrier recovery and data demodulation of high rate M-ary PSK signals are analysed. Costas and Square Loops are a main in the consideration. Methods to cope with inherent problems related to noise performance, settling time and lock range are discussed and corresponding algorithms are proposed. The Questions...
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