We propose two application-layer coding schemes for delay-constrained point-to-point packet communications with restrictions on the transmitter's maximum duty-cycle. The schemes operate over GF(2) and utilize inte...
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ISBN:
(纸本)9781728150895
We propose two application-layer coding schemes for delay-constrained point-to-point packet communications with restrictions on the transmitter's maximum duty-cycle. The schemes operate over GF(2) and utilize intermittently available receiver feedback for erasure correction. applications that will benefit from the proposed schemes include wireless sensor networks in which energy-constrained sensors must deliver readings to a gateway within a deadline. Simulation results for independent Bernoulli erasure channels, Gilbert-Elliott channels, and Long Range (LoRa) communications demonstrate orders-of-magnitude reductions in the delivery failure rate as compared to feedback-assisted repetition redundancy and a blind coding scheme that does not utilize feedback.
The effectiveness of application-layer coding in a system with a large number of users is considered. The end users encode data packets before transmitting them. The effect of additional packets on the system performa...
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The effectiveness of application-layer coding in a system with a large number of users is considered. The end users encode data packets before transmitting them. The effect of additional packets on the system performance is twofold: (i) additional packets increase offered load, which results in higher drop probability, and (ii) some of dropped packets can be recovered at the receivers after decoding. It is argued that the space of all systems can be partitioned into two regions where coding is beneficial and detrimental, respectively. In particular, the paper establishes an asymptotic regime that contains the boundary between these two regions. On the boundary, systems with and without coding have the same performance. Informally, our results indicate that application-layer coding improves the performance only in systems with low loss probabilities (without coding), and employing such coding in systems with high loss probabilities only degrades the performance.
A communication scheme for the multiple antenna multicast fading channel is proposed, in which the transmission is coded at the applicationlayer over a number of channel realizations. The scheme gives rise to a novel...
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ISBN:
(纸本)9781457705953
A communication scheme for the multiple antenna multicast fading channel is proposed, in which the transmission is coded at the applicationlayer over a number of channel realizations. The scheme gives rise to a novel multicast transmit beamforming problem. The properties of the proposed scheme are presented, in particular the scaling of the achievable rate for the increasing number of users is investigated and the rate is shown not to decrease to zero, which is an improvement over multicast schemes without coding, e. g. so-called max-min transmit beamforming. Algorithms for solving the resulting beamforming problem are proposed and evaluated in simulation.
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