Modulation and demodulation for cooperative diversity in wireless systems
IEEE Transactions on Wireless Communications
On the achievable diversity-multiplexing tradeoff in half-duplex cooperative channels
IEEE Transactions on Information Theory
Broadcast Channels With Cooperating Decoders
IEEE Transactions on Information Theory
Cooperative Relay Broadcast Channels
IEEE Transactions on Information Theory
Minimum energy per bit for Gaussian broadcast channels with common message and cooperating receivers
Allerton'09 Proceedings of the 47th annual Allerton conference on Communication, control, and computing
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This paper considers a system where one transmitter broadcasts a single common message to two receivers linked by a bidirectional cooperation channel, which is assumed to be orthogonal to the downlink channel. Assuming a simplified setup where, in particular, scalar relaying protocols are used and channel coding is not exploited, we want to provide elements of response to several questions of practical interest. Here are the main underlying issues: (1) the way of recombining the signals at the receivers; (2) the optimal number of cooperation rounds; (3) the way of cooperating (symmetrically or asymmetrically, which receiver should start cooperating in the latter case); and (4) the influence of spectral resources. These issues are considered by studying the performance of the assumed system through analytical results when they are derivable and through simulation results. For the particular choices we made, the results sometimes do not coincide with those available for the discrete counterpart of the studied channel.