نتایج جستجو برای: key pre

تعداد نتایج: 847114  

Journal: :Concurrency and Computation: Practice and Experience 2018

2004
Guangyue Han

by Guangyue Han Recently there has been considerable interest in wireless communication systems using multiple antennas. Theoretical analysis shows that such systems can provide spacial and temporal diversity gain if appropriate signal sets are employed. This dissertation analyzes and designs suitable signal constellations for such systems. Diversity product and diversity sum will be derived as...

Journal: :IEEE Trans. Communications 1998
Marvin K. Simon Dariush Divsalar

Using an alternate form of the Gaussian probability integral discovered a number of years ago, it is shown that the solution to a number of previously considered communication problems can be simplified and, in some cases, made more accurate (i.e., exact rather than bounded). These problems include the evaluation of: 1) bit-error probability of uncoded phaseshift keying (PSK) with Costas loop t...

Journal: :CoRR 2005
Wenyi Zhang J. Nicholas Laneman

This paper investigates the achievable information rate of phase-shift keying (PSK) over frequency non-selective Rayleigh fading channels without channel state information (CSI). The fading process exhibits general temporal correlation characterized by its spectral density function. We consider both discrete-time and continuous-time channels, and find their asymptotics at low signal-to-noise ra...

2014
Zain ul Abidin Jaffri Muhammad Tahir Sundas Rauf

In this paper, we investigates the effects of two different modulation schemes for image transmission using an OFDM (Orthogonal Frequency Division Multiplexing) transceiver. The main aim is to evaluate the performance between 16PSK (Phase Shift Keying) and 16QAM (Quadrature amplitude modulation) in context of BER (Bit Error Rate) in AWGN (Additive White Gaussian Noise) channel. We evaluate the ...

Journal: :IEEE Signal Process. Lett. 2010
Saeed Gazor M. Derakhtian AliAkbar Tadaion

In this paper, we develop a computationally efficient algorithm for the Maximum Likelihood (ML) sequences estimation (MLSE) of an M-ary Phase Shift keying (M–PSK) signal transmitted over a frequency non-selective slow fading channel with an unknown complex amplitude and an unknown variance additive white Gaussian noise. The proposed algorithm also provides the ML estimates of the complex amplit...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیراز - دانشکده زبانهای خارجی 1393

feminine voice and narratology in wuthering heights wuthering heights as a general "bronte" work has extraordinary dimensions to it which can make it focal to different ways of interpretation. among other differences the issue of narrative voice is essential in understanding the ultimate purpose of wuthering heights. emily bronte uses different narrators from various focal points speaking of m...

2010
Niyazi ODABAŞIOĞLU

In recent years, there has been a vast amount of research on cooperative diversity due to its potential capacity increase. Almost all of the research has been based on linear modulation formats such as phase-shift keying (PSK) or quadrature amplitude modulation (QAM). On the other hand, continuous phase modulation (CPM) promises impressive advantages relative to linear modulations for wireless ...

Journal: :EURASIP J. Wireless Comm. and Networking 2006
Tao Shi Lei Cao

A differential detection scheme for space-time spreading with two transmit antennas is proposed. The scheme does not require channel state information at either the transmitter or the receiver. With segmentation and preamble symbols padded at the transmitter, the receiver recovers the information using differential detection. Both phase-shift keying (PSK) and quadrature amplitude modulation (QA...

Journal: :CoRR 2018
Ekaterina Bayguzina Bruno Clerckx

Far-field wireless power transfer (WPT) and simultaneous wireless information and power transfer (SWIPT) have become increasingly important in radio frequency (RF) and communication communities recently. The problem of modulation design for SWIPT has however been scarcely addressed. In this paper, a modulation scheme based on asymmetric phase-shift keying (PSK) is considered, which improves the...

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