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This paper presents a strategy for additional improvement of Coded Orthogonal Frequency Division Multiplexing properties of the mobile receiver. This improvement is a result of combining of soft decoding techniques with additional redundancies for error recognition and correction.
This research focuses on improving GNSS carrier phase tracking performance in multipath fading environments. A new approach based on frequency diversity combining at correlator level is proposed to enhance carrier phase estimation robustness. The proposed method works on the fact that in a multipath environment the fading observed in different frequency bands is independent of each other. The uncorrelated...
The secrecy characteristics of random wireless networks considering a generalized fading model, where the communication nodes are equipped with multiple antennas is analyzed. Using stochastic geometric tools, we investigate the secrecy outage probability of such networks from the perspective of the kth best source, which has still not been well characterized in the literature. In particular, we derive...
Interference alignment (IA) is a suggested technique for multiple input multiple output (MIMO) based multipath interference channels to achieve large multiplexed gain. CSI (Channel state information) is required by IA schemes to design precoding vectors at the transmitter side. There will be significant capacity overhead in feedback link. This paper concentrates on the MIMO channels which are having...
Communication technologies have evolved at a very rapid rate over the last few years with 3G and 4G networks being widely deployed. With 5G already in the reckoning, communication systems which can serve acceptable error rates with minimum delay are the need of the hour. Versatile DPLL based systems find place as modern day communication receivers. Standalone DPLL receivers based on Zero Crossing...
In vehicular application, the wireless receiver not only considers the channel effect, like Doppler effect, Shadowing effect, Multipath fading, … etc., but also the impulse jamming and continuous wave (CW) jamming from the device in the vehicle. This paper presents anti-jamming automatic gain control (AGC) and packet detection for vehicular receiver. In impulse jamming and CW jamming existence, the...
During the past decade, Molecular Biology wet labs and sequencing activities have been generating a vast amount of data, causing an increase in the adoption of new methods and tools for identification and analysis. In particular, the use of software agent technology in bioinformatics applications has been on the rise, due some of its unique features as autonomy and remote execution capabilities. However,...
This paper presents a performance model of the reception process in a wireless link with one antenna transmitter and a multiple-antenna maximum-ratio combining (MRC) receiver. The objective is to address the performance evaluation of multiple antenna systems enabled with adaptive modulation and coding (AMC). Two main assumptions are used: 1) Rayleigh fading correlated channels, and 2) imperfect (outdated)...
As originally designed, the wavelet coding technique efficiently overcomes the fading effects, but limits the spectral efficiency of these systems to 1 bit/s/Hz. Furthermore, the coded symbols are modulated by unusual signal constellations that need to be designed by optimization methods. An alternative approach based on wavelet matrix to increases the communication system robustness to time-varying...
We consider the MIMO wiretap channel, where a legitimate transmitter (Alice) wishes to communicate a confidential message to the legitimate receiver (Bob) over a MIMO channel, while its messages are being eavesdropped by Eve through another MIMO channel. Supposing that Alice uses the nested lattice code proposed in [8], we characterize the expected value of amount of information leakage to Eve, and...
In this paper, we study simultaneous wireless information and power transfer (SWIPT) in a multi- user interference single-input single-output (SISO) system. We first solve the ergodic rate optimization problem theoretically and derive the PS scheme and the TS scheme to obtain the optimal strategy of getting maximum ergodic capacity while harvesting sufficient energy to ensure receiver circuit working...
In this paper, a rate allocation policy is proposed for truncated transmission of spinal codes based on imperfect feedback over block fading channels. By constructing and solving the throughput optimization problem, the optimized rate allocation policy is obtained under the constraint of limited transmission attempts and frame error probability. Both analysis and simulations show that the rate-allocated...
Fifth-generation cellular networks are expected to exhibit at least three primary physical-layer differences relative to fourth-generation ones: millimeter-wave propagation, antenna-array directionality, and densification of base stations. In this paper, the effects of these differences on the performance of single-carrier frequency-domain multiple-access uplink systems with frequency hopping are...
Radio frequency (RF) based wireless charging and information transfer, also known as simultaneous wireless information and power transfer (SWIPT), is a new paradigm of green-energy wireless communications. In this work, we apply SWIPT to cooperative communication networks where each relay is equipped with an energy harvesting (EH) circuit to extract and convert the RF signal into useable energy for...
The ergodic capacity of spatially-correlated non-coherent multiple-input multiple-output channels is not known. In this paper upper and lower bounds are derived for this capacity at asymptotically high signal-to-noise ratios (SNRs). The bounds are accurate within an approximation error that decays as 1/SNR, and the gap between these bounds depends solely on the signalling dimensions and the condition...
In this paper the performance of wireless receiver with an automatic frequency control (AFC) loop in the presence of α-μ multipath fading and single interference is considered. Closed form expression for average switching rate (ASR) is obtained and used for evaluation of the mean time to loss of lock (MTTL). Numerical results are presented and used to determine the influence of α-μ fading parameters...
Gaussian distribution as a source of additive noise is a wellknown modeling assumption, which lead to important and insightful results on the channel capacity, detection reliability, and estimation accuracy. It is also well-recognized that in many practical settings the Gaussian distribution may not be adequate to model the underlying noise phenomenon, and various non-Gaussian noise models are employed...
In this paper, the expression for channel capacity of dual correlated selection combining (SC) system applying desired signal decision algorithm is derived. Fading of both desired and cochannel interference (CCI) is modelled by Weibull distribution with different fading severity levels. Numerical results are presented to accomplish proposed mathematical analysis and to examine influence of branch...
In this article, we carryout performance analysis on energy detectors in myriads of generalized fading environments. We utilize a new “exponential-type” contour and finite-range integral representations for the generalized M-th order Marcum Q-function QM(α,β) when its real order M>0 is not necessarily an integer. The accuracy of the new alternative integral representation for Marcum Q-function...
Recently, a scheme called Orthogonal Frequency Division Multiplexing (OFDM) with Generalized Index Modulation (OFDM-GIM) is proposed, in which the number of active subcarriers in an OFDM sub-block is adjustable and a higher spectral efficiency is achieved compared with the conventional Orthogonal Frequency Division Multiplexing with Index Modulation(OFDM-IM) scheme. In this paper, based on the general...
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