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In this paper, we consider a cognitive relay assisted single-input multiple-output (SIMO) communication scenario through Rayleigh fading channel where multiple primary and secondary users wish to communicate with two different receivers in the presence of a cognitive relay. We assume that secondary users transmit simultaneously with the primary users over the same channel instead of waiting for an...
In this paper, we first analyze the outage performance of two user cognitive radio channel where the cognitive user causally obtains primary user's message knowledge. Specifically, we consider cognitive rayleigh fading channel where the cognitive user uses superposition coding to relay the primary user's message to compensate for the interference caused by its own transmission to the primary receiver...
Distributed orthogonal space-time block code (DOSTBC) designs have the potential to achieve significant diversity gain in relay networks but such designs do not use any channel information at the transmitter to optimize the system performance. When channel information is available fully or partially at the relays, transmit beamforming can be employed to enhance the performance of the wireless relay...
In this paper, we present a low complexity maximum likelihood (ML) detection based on the sphere decoder (SD) for distributed time-reversal space-time block code (D-TR-STBC) with frequency selective fading links. Unlike direct transmission, the relay-assisted transmission results in higher number of taps for the resultant end-end channel. The complexity of Viterbi algorithm (VA) grows exponentially...
This paper investigates the coding gain achieved between the best relay and the relay subset selection in a two-hop wireless network with relay-assisted transmission. Both best relay and relay subset selection achieves the maximum diversity, but the later becomes a better alternative in certain scenarios. First in low mobility scenarios, when the channel fading remains static for longer duration and...
In this paper, we design and analyse a distributed time-reversal space-time block code (D-TR-STBC) that can achieve significant power gain and optimum diversity order in a relay-assisted transmission for single-carrier frequency-selective channels. The idea behind distributed space-time block coding (D-STBC) is to have the relays cooperate in such a way that the signal at the destination is a space-time...
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