2007 search results - page 60 / 402 » SPECTRUM |
104
Voted
TMC
2010
15 years 1 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...
123
click to vote
TMC
2010
15 years 1 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 ...
148
Voted
WCNC
2010
IEEE
15 years 1 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...
130
Voted
WIOPT
2010
IEEE
15 years 1 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...
161
Voted
GLOBECOM
2009
IEEE
15 years 1 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...