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Collaborative communication produces high power gain, if the frequency and phase synchronization is achieved. In this paper a novel architecture is proposed for a collaborative communication system in the presence of AWGN and frequency offsets. The mathematical expressions are derived and verified through simulation for received power and bit error rate (BER) of the system. It is analyzed that using...
In this paper, we consider the spectrum sharing cognitive radio system, which single-input multiple-output fading channel is assumed. Subject to the average interference constraint of primary user, the outage capacity of cognitive user involving joint beamforming and power control is analyzed. We derive the expressions of outage probability under different channel fading models including Raleigh fading,...
This paper presents a new coded cooperation scheme based on Reed Solomon code. The new scheme offers transmission security since the second frame of the partitioned data contains only partial of the parity check data. A new algorithm for handling the choice of cooperation level between the users is also developed. Simulation results of the new scheme over multipath Rayleigh fading channels show around...
A novel switched scheme is proposed for diversity-multiplexing switched multiple-input multiple-output (D-M MIMO) system under Raleigh fading based on bit error rate (BER). The proposed scheme is a closed-loop multiple antenna system, and the tradeoff between the diversity and multiplexing gains that can be simultaneously achieved over a low-rate limited feedback channel. Furthermore, based on the...
In cognitive radio networks, two classes of devices exist: primary and secondary. Primary devices are granted privileged access to the spectrum while secondary devices must limit their transmissions so as not to generate harmful interference. In this paper we investigate the minimum size that a low duty cycle secondary network must possess if it is to be deemed useful, i.e., at least one node can...
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