We study the performance of constant-power variable-rate M-QAM schemes over Nakagami fading channels. We obtain closed-form expressions for the outage probability, spectral eeciency and average bit-error-rate (BER) assuming perfect channel estimation and negligible time delay. For a target BER of 10 ?3 , the spectral eeciency of adaptive continuous rate M-QAM comes within 5 dB of the Shannon ca...

The High-speed Downlink Packet Access (HSDPA) of the Universal Mobile Telecommunication System (UMTS) provides a flexible and efficient packet transmission platform, and has been attracting operators to integrate a diverging variety of services. We studied the possibilities of delivering conversational speech traffic in the form of voice over IP (VoIP), over HSDPA. To provide the VoIP QoS typif...

N radio and satellite channels, system performance is 0 degraded by Rician or Rayleigh fading resulting from multipath propagation. Performance can be improved by channel coding combined with interleaving; the deinterleaver at the receiver allows decorrelation of the fading. A criterion, deduced from a Chemoff error probability bound, for the design of trellis-coded modulation for uncorrelated ...

A novel spatial modulation (SM) scheme suitable for correlated Rician fading scenario is proposed with the help of the key idea of Ungerboeck’s set partitioning. The motivation is based on the fact that the different error performance exists between the antenna domain and modulation signal domain in the traditional SM scheme. And the total system error performance is mainly determined by the wo...

High–bit–rate communication over power lines is a promising solution to the last–mile problem. We examine the use of bandwidth–efficient, non–coherent multicarrier modulation as simple, flexible, and robust transmission scheme over power–line channels. Adaptive, requiring channel state information at the transmitter, and non–adaptive multicarrier modulation are discussed and assessed. The effec...

Photovoltaic systems integrated to the grid have received considerable attention around the world. They can be connected to the electrical grid via galvanic isolation (transformer) or without it (transformerless). Despite making galvanic isolation, low frequency transformer increases size, cost and losses. On the other hand, transformerless PV systems increase the leakage current (common-mode c...

Radio-over fiber technology (RoF) fulfills the demand of future wireless services. In this paper, simulative analysis of radio-over fiber system employing external modulation using MachZehnder modulator is carried out by considering the effect of fiber dispersion. Analytical and simulative analysis shows the periodic behaviour of system with respect to modulation index and length of the optical...

Error control codedM-ary pulse position modulation (PPM) can be used over free space optical links to mitigate the atmospheric attenuations and the turbulence induced fading. In this paper, we present performance analysis for coded free space optics (FSO) communication systems operating over various atmospheric conditions. We justify the selection of higher state PPM as an appropriate modulatio...

Except for a few simple digital modulation techniques, derivation of average bit error probability over fading channels is difficult and is an involved process. In this letter, curve fitting technique has been employed to express bit error probability over AWGN of any digital modulation scheme in terms of a simple Gaussian function. Using this Gaussian function, a generalized closed form expres...