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The 2012 26th Biennial Symposium on Communications (QBSC) proceedings was produced for IEEE by The Printing House, Inc. Copyright and Reprint Permission: Abstracting is permitted with credit to the source. Libraries are permitted to photocopy beyond the limit of U.S. copyright law for private use of patrons those articles in this volume that carry a code at the bottom of the first page, provided the...
In this talk, we present techniques to enable green communications in future generation of wireless systems that will rely on cooperation and cognition to meet increasing demand of high data rate. So far, achieving high data rate has been the primary focus of research in cooperative and CR systems, without much consideration of energy efficiency. However, many of these techniques significantly increase...
The 26th edition of QBSC marks also its 50th year since it has been initiated in 1962 by the Electrical and Computer Engineering Department, Queen??s University. In 2010 we celebrated our 25th anniversary with the participation of a number of historical contributors to this important landmark for the telecommunications research in Canada. This year, we are offering you an excellent program, including...
Coherent wireless optical communications (WOC) is a viable alternative to irradiance modulation with direct detection for atmospheric channels impacted by turbulence. Effective techniques such as channel coding and diversity can be introduced to mitigate the turbulence effects, but transmit diversity for coherent WOC has not been reported due to the phase noise imposed on the electric fields of multiple...
We study the error rate of a subcarrier intensity modulated multiple-input multiple-output wireless optical communication system employing phase-shift keying, differential phase-shift keying, and noncoherent frequency-shift keying over the Gamma-Gamma turbulence channels. Closed-form error rate expressions are derived using a series expansion approach. Truncation error analysis and asymptotic error...
This paper investigates the performance of spacedivision multiple access (SDMA) schemes in cognitive radio systems (CR) with multiple primary users (PUs) and secondary users (SUs) sharing the same spectrum. By adding more constraints to the conventional SDMA schemes and using the optimization of the Lagrange multipliers we developed an iterative weights calculating method to determine the new cognitive...
We present a successful transmission of an IEEE 802.11n 2×2 Multiple Input — Multiple Output radio signal over standard graded index multimode fiber at several kilometers length. For the first time commercially available Access Points were used in the MIMO over multimode fiber experiment. Transmission was carried above the baseband of the multimode fiber (in passband), the electrical carrier was at...
There is currently an ongoing debate surrounding what would be the best choice for smart grid communication technology. One of the promising communication technologies for smart grid realization is Powerline Communication (PLC). However, because of its noisy environment and the low capacity of Narrowband Powerline Communication, its viability for smart grid realization is being questioned. To investigate...
Linear least squares (LS) and maximum likelihood (ML) estimators are derived for emitter geolocation using both received signal strength (RSS) and angle of arrival (AOA) information obtained from an heterogeneous sensor array. The results of simulation experiments provide useful insights into the behavior of these hybrid approaches and demonstrate that the use of simple RSS sensors to augment traditional...
In this paper, we investigate the information theoretical limits on the performance of cooperative multicarrier underwater acoustic (UWA) communication systems. We assume decode-and-forward (DF) relaying and consider non-orthogonal half-duplex cooperation. Under the assumptions of sparse and frequency-selective Rician fading channel and correlated Gaussian ambient noise, we derive the maximum achievable...
In this paper, we propose a novel cooperative multi-hop transmission protocol (NCMT). In the proposed protocol, cooperative communication is used to decrease the end-to-end outage probability and reduce the number of transmissions due to the skipped hops. The performances are evaluated via theoretical analyses and Monte Carlo simulations.
When working with multiple antenna systems, spatial and/or temporal correlation between antennas has a great impact on the overall performance of the communication system. In this paper we present an approximate approach for accounting for both spatial and temporal correlation in cognitive radio devices equipped with multiple antennas. We derive an equivalent number of independent samples, based on...
Although error-prone patterns have been extensively studied for low-density parity-check (LDPC) codes, to the best of our knowledge, they have never been fully explored for Fountain codes. It is shown that dominant trapping sets of Fountain codes are the absorbing sets. They happen in the so-called error floor, corresponding to a significant flattening in the error probability curves. In this paper,...
This paper presents a theoretical foundation for a new collision correcting medium access control (MAC) and physical (PHY) cross layer design (CLD) for safety messages in dedicated short range communications (DSRC). The concept relies on repetition messaging and the fact that DSRC safety messages are relatively short in length. Hence our design requires a cache of previously received packets, and...
The DSRC safety messaging system was initially proposed for emergencies and vehicle safety applications; having a high reliability is a major design factor. Due to the fact that the DSRC system has different data rates according to its modulation and coding schemes, a minimum SNR threshold for different data rates is required for successful message transmission. This paper provides the different SNR...
In this paper, we develop a simple closed-form generalized likelihood ratio test (GLRT) detector for a multi-relay amplify-and-forward (AF) cooperative network employing noncoherent M-ary frequency-shift keying (M-FSK). The proposed detector is robust in the sense that it does not require any prior knowledge about the channels such as the variance of the additive white Gaussian noise, the fading model,...
Distributed storage systems frequently use erasure coding based redundancy or replication to improve availability. Traditional erasure coding based approaches to redundancy are optimal in terms of their storage overhead-reliability tradeoff, but are expensive to repair. In this paper, we propose Proactive Repair (PR), a novel hybrid redundancy scheme. We discuss the implementation of the proposed...
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