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Sparse-code multiple-access (SCMA) is a novel multiplexing method to increase the capacity of wireless communication systems. By giving users non-orthogonal codebook with few non-zero entries, the SCMA approach can highly improve the spectral efficiency, compared with traditional orthogonal ones such as CDMA, with tolerable detection complexity. Therefore, it has been considered as an option for 5G...
Ambient backscatter is a new technology that utilizes environmental wireless signals to enable battery-free devices to communicate with each other. In this paper, we investigate the problem of signal detection for the full duplex wireless system utilizing ambient backscatter. Since one of the key technologies of full duplex wireless system is self-interference cancellation, we first estimate the channel...
We study an entangled QKD system using photons at 780nm, 1550nm and 4μm from a SPDC nonlinear crystal, over a 30km maritime channel. An analysis of the channel at each wavelength is performed and the QKD system is simulated for each wavelength.
IEEE 802.11b WLAN is widely used to implement Wi-Fi based Time Difference of Arrival (TDoA) indoor localization. This paper presents a novel IEEE 802.11b baseband receiver and the corresponding localization system. Frame detector and phase recovery block are dedicated to frame reception and frequency offset compensation. Baker code re-correlator is specially designed to improve anti-noise performance...
Jaya optimization algorithm (JOA) based multiuser detector over generalized-K (GK) fading channels, in the presence of impulsive noise, is presented in this paper to eliminate multiple access interference (MAI) problem. The JOA is used to implement the M-decorrelator with least squares (LS), Huber (HU), Hampel (HA) and modified Hampel (MH) estimators by minimizing the corresponding penalty functions...
Power line communication (PLC) is an emerging technology for the realization of smart grid and home automation. It utilizes existing power line infrastructure for data communication in addition to the transmission of power. The PLC channel behaves significantly different from the wireless channel; and it is characterized by signal attenuation as well as by additive noise and multiplicative noise effects...
Ambient backscatter is a new technology that utilizes existing wireless signals of other communication systems to enable small devices to communicate with each other. One key problem for ambient backscatter is that if it will result in interference on existing communication systems. We investigate this problem in this paper. Specifically, we build up the theoretical system model for the ambient backscatter...
This work studies the performance of a cooperative network which consists of two channel-coded sources, multiple relays, and one destination. Due to the spectral efficiency constraint, we assume that a single time slot is dedicated to relaying. Conventional network-coded based cooperation (NCC) selects the best relay which uses network coding to serve the two sources simultaneously. It is shown that...
In this paper, spatial modulation (SM) technique and low density parity check code (LDPC) are combined. SM technique seems to provide transmissions speed and spectral efficiency at same levels under the low system complexity and cost compared to traditional multiple input multiple output (MIMO) transmission systems. However, SM may give high bit error rate (BER) values at low signal to noise ratios...
In this work, we propose the method for clusters region factor graph, the four targets in 3×3 two-dimensional (2D) interference channel matrix. We apply the clusters region into the two 3×2 vertical matrix targets, and similarly the cluster region into the two 2×3 horizontal matrix targets. Moreover, the factor graph is defined based on the 3×3 2D interference channel matrix using belief propagation...
In this paper, we compare the performance of the generalized belief propagation detector and the layered generalized belief propagation detector with a Log-MAP algorithm and max algorithm for the message passing on the factor graph. Which message-passing sequential of the LGBP detector is used to update the nodes sequentially instead of simultaneously in the factor graph. The simulation results show...
The ultra-wide band (UWB) technology can be used for low cost and low power applications such as body area networks, IoT based applications, wireless sensor networks and high data rate short range wireless communications. In the UWB literature, non-coherent energy detector (ED) receiver is proposed to reduce receiver implementation complexity by avoiding the complex channel estimation process and...
This paper investigates the problem of recovering an n-dimensional BPSK signal x0 ∈ {−1, 1}n from m-dimensional measurement vector y = Ax+z, where A and z are assumed to be Gaussian with iid entries. We consider two variants of decoders based on the regularized least squares followed by hard-thresholding: the case where the convex relaxation is from {−1, 1}n to ℝn and the box constrained case where...
Multiple - Input Multiple - Output is another era innovation that guarantees noteworthy increments in throughput and scopes of remote correspondence with no expansion in transmit control. A MIMO framework depends on procedures, for example, spatial multiplexing, transmit differing qualities and beam forming to enhance the nature of transmission, information rates and received signal gain and in addition...
In this paper, the decision-level data fusion techniques are extended to the multiuser detection (MUD) field. Then a novel MUD algorithm that is the combine application decision-level fusion criterion (CA-DFC) based MUD algorithm is proposed for DS-UWB communication systems. In CA-DFC based method, the combine detectors can make decisions among the preliminary decisions from sub-optimal detectors...
Spatial Modulation (SM) is a recently developed transmit technique, and it has attracted wide interests for it gains higher transmit rate than single-input-single-output (SISO) system and provides simpler transceiver structure and lower power consumption compared with traditional MIMO system. In this paper, we propose the spatial modulation systems with frequency and quadrature amplitude modulation...
A new type of multi-rate clock and data recovery (CDR) circuit is realized that can operate at multiple data rates of 3.5, 7.0 and 14-Gb/s. A multi-mode rotational binary phase detector supports full-rate, half-rate and quarter-rate CDR operation with only one voltage-controlled oscillator. A prototype CDR circuit implemented in 65nm CMOS technology successfully demonstrates the multi-rate operation...
In this paper, a novel modified Particle Swarm optimization (mPSO) technique is proposed for multiuser detection (MUD) which is performed for multicarrier code division multiple access (MC-CDMA) communication systems. In MC-CDMA systems the users have their own spreading codes. The users also share same frequency band simultaneously which allows the system to transmit data at higher rate but the problem...
Multi user detection is an ongoing research in detection theory. They are used to reduce the effect of Multipath fading. In this paper, MEM (Maximum entropy method has been combined with ANN (Artificial neural network) in order to optimize various parameters of CDMA system. We consider the problem of multipath fading and noise in signals being received in CDMA systems. Among all basic detection schemes...
A cost effective approach for better communication to overcome the near-far problem in CDMA system in case of Direct Sequence Spread Spectrum (DSSS) multiuser system instead of single user is depicted in the paper. The need for improvement of the hearability problem in modern telecommunication system has huge applications in security section. A comparative study of Bit Error Rate (BER) vs Signal to...
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