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Performance limits on ranging with cognitive radio
(IEEE, 2009-06)
Cognitive radio is a promising paradigm for efficient utilization of the radio spectrum due to its capability to sense environmental conditions and adapt its communication and localization features. In this paper, the ...
Cognitive-radio systems for spectrum, location, and environmental awareness
(IEEE, 2010)
In order to perform reliable communications, a system needs to have sufficient information about its operational environment, such as spectral resources and propagation characteristics. Cognitive-radio technology has ...
Time-delay estimation in dispersed spectrum cognitive radio systems
(SpringerOpen, 2010)
Time-delay estimation is studied for cognitive radio systems, which facilitate opportunistic use of spectral resources. A two-step approach is proposed to obtain accurate time-delay estimates of signals that occupy multiple ...
Time delay estimation in cognitive radio systems
(IEEE, 2009-12)
In cognitive radio systems, secondary users can utilize multiple dispersed bands that are not used by primary users. In this paper, time delay estimation of signals that occupy multiple dispersed bands is studied. First, ...
Error rate analysis of cognitive radio transmissions with imperfect channel sensing
(Institute of Electrical and Electronics Engineers Inc., 2014)
This paper studies the symbol error rate performance of cognitive radio transmissions in the presence of imperfect sensing decisions. Two different transmission schemes, namely sensing-based spectrum sharing (SSS) and ...
Fundamental limits on time delay estimation in dispersed spectrum cognitive radio systems
(IEEE, 2009)
In this paper, fundamental limits on time delay estimation are studied for cognitive radio systems, which facilitate opportunistic use of spectral resources. First, a generic Cramer-Rao lower bound (CRLB) expression is ...
Interference mitigation and awareness for improved reliability
(Cambridge University Press, 2011)
Wireless systems are commonly affected by interference from various sources. For example, a number of users that operate in the same wireless network can result in multiple-access interference (MAI). In addition, for ...
On the interplay between channel sensing and estimation in cognitive radio systems
(IEEE, 2011)
Cognitive radio transmissions in the presence of channel uncertainty are considered. In practical scenarios, cognitive secondary users need to perform both channel sensing in order to identify whether the channel is being ...
Range estimation in multicarrier systems in the presence of interference: performance limits and optimal signal design
(IEEE, 2011)
Theoretical limits on time-of-arrival (equivalently, range) estimation are derived for multicarrier systems in the presence of interference. Specifically, closed-form expressions are obtained for Cramer-Rao bounds (CRBs) ...
Error rate analysis of cognitive radio transmissions with imperfect channel sensing
(IEEE, 2013)
In this paper, error rate performance of cognitive radio transmissions is studied in the presence of imperfect channel sensing decisions. It is assumed that cognitive users first perform channel sensing, albeit with possible ...