QoS-Driven Power Allocation Over Parallel Fading Channels With Imperfect Channel Estimations in Wireless Networks

— We propose the quality-of-service (QoS) driven power allocation schemes for parallel fading channels when considering imperfect channel estimations. In particular, the parallel communication model plays a fundamental role in physicallayer evolutions of wireless networks. By integrating information theory with the concept of effective capacity, our proposed schemes aim at maximizing the system throughput subject to a given delay constraint. Solving the original non-convex problem by a 2-dimensional convex optimization approach, we develop the optimal allocation algorithms under different QoS and power constraints. Consistent with our previous work assuming perfect channel state information (CSI), our analyses considering imperfect CSI demonstrate that when the QoS constraint becomes more and more stringent, the optimal effective capacity decreases from the ergodic capacity to the zero-outage capacity. Moreover, our results indicate that the channel estimation error has a significan...

• Type: Conference
• Year: 2007
• Where: INFOCOM
• Authors: Jia Tang, Xi Zhang
• Keywords: Channel Estimation, Communications, Delay Constraint, Effective Capacity, INFOCOM 2007