Paper Info
Title
Convolutive superposition for multicarrier cognitive radio systems.
Abstract
Recently, we proposed a spectrum-sharing paradigm for single-carrier cognitive radio (CR) networks, where a secondary user (SU) can maintain or even improve the performance of a primary user (PU) transmission, while also obtaining a low-data rate channel for its own communication. According to such a scheme, when the SU is able to receive the signal transmitted from the PU, it can superimpose its transmission on the PU signal by simple multiplicative precoding, without requiring any cooperation between the primary and secondary systems. The scope of this paper is to extend such a paradigm to a multicarrier CR network, where the PU employs an orthogonal frequency-division multiplexing (OFDM) modulation scheme. To improve its achievable data rate, the SU is allowed to transmit multiple symbols in parallel over the OFDM subcarriers of the primary system. In particular, the SU convolves its block-precoded symbols with the received PU signal in the time domain, which gives rise to the term convolutive superposition. An information-theoretic analysis of the proposed scheme is developed, which considers different amounts of channel state information at the secondary transmitter, as well as different precoding strategies for the SU. Extensive simulations illustrate the merits of our analysis and designs, in comparison with other CR schemes, by using as a performance indicator the ergodic channel capacity.
Year
DOI
Venue
2016
10.1109/JSAC.2016.2615438
IEEE Journal on Selected Areas in Communications
Keywords
DocType
Volume
OFDM,Interference,Precoding,Cognitive radio,Frequency-domain analysis,Time-domain analysis
Journal
abs/1605.02607
Issue
ISSN
Citations 
11
0733-8716
3
PageRank 
References 
Authors
0.39
21
3
Name
Order
Citations
PageRank
Donatella Darsena118217.78
Giacinto Gelli221122.46
Francesco Verde325424.42