Journal ArticleDOI
Differential Modulation for Cooperative Wireless Systems
Qiang Zhao,Hongbin Li +1 more
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TLDR
It is shown that the differential cooperative DAF and DDF schemes achieve cooperative diversity and outperform the conventional noncooperative differential modulation.Abstract:
This paper examines differential binary modulation for wireless networks that utilize wireless relays to seek cooperative diversity and improved performance. Two differential cooperative transmission schemes, referred to as differential amplify-and-forward (DAF) and differential decode-and-forward (DDF), respectively, are introduced. These schemes require no channel state information at any node in the system. A set of analytical results pertaining to the probability density function of the instantaneous signal-to-noise ratio, average bit error rate, outage probability, and diversity order of the proposed schemes in Rayleigh fading channels are obtained. The analytical results are confirmed by numerical simulations. It is shown that the differential cooperative DAF and DDF schemes achieve cooperative diversity and outperform the conventional noncooperative differential modulationread more
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Journal ArticleDOI
Decode-and-Forward-Based Differential Modulation for Cooperative Communication System With Unitary and Nonunitary Constellations
TL;DR: A maximum-likelihood decoder of the differential data in a decode-and-forward (DF)-based cooperative communication system utilizing uncoded transmissions applicable to complex-valued unitary and nonunitary constellations suitable for differential modulation under uncodes transmissions is derived.
Journal ArticleDOI
Average BER Analysis of Differential Modulation in DF Cooperative Communication System over Gamma-Gamma Fading FSO Links
TL;DR: It is demonstrated by analysis and simulation that the differential DF FSO system is able to achieve significant performance gain over a non-cooperative direct transmission based differential FSOSystem.
Proceedings ArticleDOI
An experimental framework for the evaluation of cooperative diversity
TL;DR: This work describes the construction of a three node, experimental testbed based upon a network of software-defined radios for development and verification of cooperative protocols and exhibits diversity benefits.
Journal ArticleDOI
Jensen-cotes upper and lower bounds on the gaussian Q-function and related functions
TL;DR: New families of lower and upper bounds on Q -functions are presented and the bounds are shown to be tighter than alternatives found in the literature, and in some cases the lower bounds provided find no equivalent in current literature.
Posted Content
Decode-and-Forward Based Differential Modulation for Cooperative Communication System with Unitary and Non-Unitary Constellations
TL;DR: In this paper, a maximum likelihood decoder of the differential data in a decode-and-forward (DF) based cooperative communication system utilizing uncoded transmissions was derived, which is applicable to complex-valued unitary and non-unitary constellations suitable for differential modulation.
References
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Book
Probability, random variables and stochastic processes
TL;DR: This chapter discusses the concept of a Random Variable, the meaning of Probability, and the axioms of probability in terms of Markov Chains and Queueing Theory.
Journal ArticleDOI
Cooperative diversity in wireless networks: Efficient protocols and outage behavior
TL;DR: Using distributed antennas, this work develops and analyzes low-complexity cooperative diversity protocols that combat fading induced by multipath propagation in wireless networks and develops performance characterizations in terms of outage events and associated outage probabilities, which measure robustness of the transmissions to fading.
A table of integrals
TL;DR: Basic Forms x n dx = 1 n + 1 x n+1 (1) 1 x dx = ln |x| (2) udv = uv − vdu (3) 1 ax + bdx = 1 a ln|ax + b| (4) Integrals of Rational Functions
Digital communications
TL;DR: This month's guest columnist, Steve Bible, N7HPR, is completing a master’s degree in computer science at the Naval Postgraduate School in Monterey, California, and his research area closely follows his interest in amateur radio.