Nolan, K.E., Sutton, P.D., Doyle, L.E., Rondeau, T.W., Le, B., Bostian, C.W. ‘Dynamic spectrum access and coexistence experiences involving two independently developed cognitive radio testbeds’ in Proceedings of 2nd IEEE International Symposium on New Frontiers in Dynamic Spectrum Access Networks, 17-20 April, 4221505, 2007, pp 270-275
The Centre for Telecommunications Value-Chain
Research (CTVR) and the Center for Wireless Telecommunications
(CWT) are carrying out joint research work investigating
the potential of different software-defined radio (SDR) and
cognitive radio (CR) systems that can coexist in common frequency
bands. This paper describes the independently developed
dynamic spectrum access test beds used in a practical coexistence
experiment. An initial analysis of actual coexistence experiences
involving a primary user and a secondary opportunistic spectrum
user in a common frequency band is also presented. The results
in this paper include an analysis of a worst case scenario
where the primary user and secondary opportunistic user are
coexisting with no guard bands separating each other. The
experimental results showed that the primary user experienced
zero packet loss when guard bands separated the primary and
secondary services. Additionally, when no guard bands were
used and the spectrum segment was maximally used over the
geographical area involved in the experiments, the signal to noise
and interference ratio (SNIR) needed to be adjusted to 20 dB by
modifying the secondary user transmissions in order to minimise
the interference experienced by the primary user.
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