Performance Guarantees in Communication Networks
Performance Guarantees in Communication Networks
Wireless Communications
End-to-End QoS Network Design: Quality of Service in LANs, WANs, and VPNs (Networking Technology)
End-to-End QoS Network Design: Quality of Service in LANs, WANs, and VPNs (Networking Technology)
On the capacity and energy efficiency of training-based transmissions over fading channels
IEEE Transactions on Information Theory
Energy efficiency of fixed-rate wireless transmissions under QoS constraints
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Effective capacity: a wireless link model for support of quality of service
IEEE Transactions on Wireless Communications
IEEE Transactions on Wireless Communications
Information theory and communication networks: an unconsummated union
IEEE Transactions on Information Theory
Fading channels: how perfect need "perfect side information" be?
IEEE Transactions on Information Theory
Spectral efficiency in the wideband regime
IEEE Transactions on Information Theory
How much training is needed in multiple-antenna wireless links?
IEEE Transactions on Information Theory
IEEE Transactions on Information Theory
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Energy efficiency of fixed-rate transmissions is studied in the presence of queueing constraints and channel uncertainty. It is assumed that neither the transmitter nor the receiver has channel side information prior to transmission. The channel coefficients are estimated at the receiver via minimum mean-square-error (MMSE) estimation with the aid of training symbols. It is further assumed that the system operates under statistical queueing constraints in the form of limitations on buffer violation probabilities. The optimal fraction of power allocated to training is identified. Spectral efficiency-bit energy tradeoff is analyzed in the low-power and wideband regimes by employing the effective capacity formulation. In particular, it is shown that the bit energy increases without bound in the low-power regime as the average power vanishes. On the other hand, it is proven that if sparse multipath fading with bounded number of independent resolvable paths is experienced, the bit energy diminishes to its minimum value in the wideband regime as the available bandwidth increases. For this case, expressions for the minimum bit energy and wideband slope are derived. Overall, energy costs of channel uncertainty and queueing constraints are identified.