2007 search results - page 60 / 402 » SPECTRUM |
TMC
2010
14 years 11 months ago
2010
—In this paper, we consider DS-CDMA/OFDM spectrum sharing systems and obtain the achievable capacity of the secondary service under different subchannel selection policies in the...
100
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TMC
2010
14 years 11 months ago
2010
—In this paper, we analyze the achievable capacity of the secondary service for overlay and underlay access strategies. We then propose a novel mixed access strategy in which in ...
112
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WCNC
2010
IEEE
14 years 11 months ago
2010
IEEE
—In this paper, we present a novel multi-carrier spread spectrum (MCSS) system which uses Parallel Sequence Spread Spectrum (PSSS) as its spreading transform. This technique call...
108
Voted
WIOPT
2010
IEEE
14 years 11 months ago
2010
IEEE
Abstract—Development of dynamic spectrum access and allocation techniques recently have made feasible the vision of cognitive radio systems. However, a fundamental question arise...
138
Voted
GLOBECOM
2009
IEEE
14 years 10 months ago
2009
IEEE
Primary user emulation attack in multichannel cognitive radio systems is discussed. An attacker is assumed to be able to send primary-user-like signals during spectrum sensing peri...