IEEE Transactions on Wireless Communications
Signal transmission with unequal error protection in wireless relay networks
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Distributed consensus-based demodulation: algorithms and error analysis
IEEE Transactions on Wireless Communications
Uncoded transmission in wireless relay networks using deterministic modeling
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
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We consider broadcasting to multiple destinations with uneven quality receivers. Based on their quality of reception, we group destinations in tiers and transmit using hierarchical modulations. These modulations are known to offer a practical means of achieving variable error protection of the broadcasted information to receivers of variable quality. After the initial broadcasting step, tiers successively re-broadcast part of the information they received from tiers of higher-quality to tiers with lower reception capabilities. This multi-tier cooperative broadcasting strategy can accommodate variable rate and error performance for different tiers but requires complex demodulation steps. To cope with this complexity in demodulation, we derive simplified per-tier detection schemes with performance close to maximum-likelihood and ability to collect the diversity provided as symbols propagate through diversified channels across successive broadcastings. Error performance is analyzed and compared to (non)-cooperative broadcasting strategies. Simulations corroborate our theoretical findings.