Magnetic resonance imaging (MRI) is generally regarded as one of the most powerful diagnostic techniques. Nevertheless, the incorporated noise during image acquisition or transmission degrades human interpretation or computer-aided analysis of the image. Thus, it appears sensible to reduce noise before performing image analysis. However, this preprocessing step should be performed with care in ...

One of the main design challenges in wireless sensor networks (WSNs) is achieving a high-data-rate transmission for individual sensor devices. The high altitude platform (HAP) is an important communication relay platform for WSNs and next-generation wireless networks. Multiple-input multiple-output (MIMO) techniques provide the diversity and multiplexing gain, which can improve the network perf...

The emergence of WIMAX has attracted significant interests from all fields of wireless communications including students, researchers, system engineers and operators. The WIMAX can also be considered to be the main technology in the implementation of other networks like wireless sensor networks. Developing an understanding of the WIMAX system can be achieved by looking at the model of the WIMAX...

| This paper presents numerical channel capacity computations for phase-shift-keyed (PSK) signal constellations with a zero-energy point, when equiprobable signaling is used and the phase of the received signal is uncertain. We refer to such constellations as on-oo-keyed PSK (OOK-PSK). We derive conditional probability density functions and compute numerical capacity curves for the following ch...

In this paper, the performance evaluation of Frequency Modulated Chaotic On-Off Keying (FM-COOK) in AWGN, Rayleigh and Rician fading channels is given. The simulation results show that an improvement in BER can be gained by incorporating the FM modulation with COOK for SNR values less than 10 dB in AWGN case and less than 6 dB for Rayleigh and Rician fading channels.

Stochastic noise, susceptibility artifacts, magnetic field and radiofrequency inhomogeneities, and other noise components in magnetic resonance images (MRIs) can introduce serious bias into any measurements made with those images. We formally introduce three regression models including a Rician regression model and two associated normal models to characterize stochastic noise in various magneti...

It is often claimed that Rician fading must also be included for Over-The-Air (OTA) testing of mobile devices with Multiple-input Multiple-output (MIMO) capabilities. However, the Line-OfSight (LOS) component varies with orientation and location of the mobile device. Therefore, we study Rician channels with random LOS to determine its significance.

The lower bound on the decoding error probability for optimal code given a signal-to-noise ratio and rate are investigated in this letter reconfigurable intelligent surface (RIS) communication system over Rician fading channel at short blocklength regime, which is key characteristic of ultra-reliable low-latency communications (URLLC) to meet need strict adherence quality service (QoS) requirem...

terleaved over L = 3 channel blocks for four different Rician factors = 0; 5; 10; and infinity (= additive white Gaussian noise (AWGN) channel). The code polynomials in octal are (133; 145; 175). Here the union bounds are truncated at d max = 42. 4 The traditional bounds (7) get tighter for increasing values of and finally coincide with the modified bound for = 1 (AWGN channel) with which no av...

Abstract—An effort has been made to illustrate the performance comparison of the Rayleigh and Rician fading channel models by using MATLAB simulation in terms of Sum rate and signal to noise ratio (SNR). We have developed algorithms for the Rayleigh and Rician fading channels, which computes the Sum rate for the primary and the secondary user. Cognitive radio is regarded as one the most promisi...