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Capacity region of multiuser shared channel available transmission power is time-varying

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3 Author(s)
Hanbyul Seo ; Sch. of Electr. Eng., Seoul Nat. Univ., South Korea ; Daeyoung Park ; Byeong Gi Lee

In this paper, we investigate the capacity region of a multiuser shared channel with time-varying transmission power, whose typical example is the forward packet data channel (F-PDCH) of IS-2000 IxEV-DV system. The concavity of the throughput yields the property that additional power contributes more to a weaker user having a lower channel gain than to a stronger user. Noting this property, we consider a power-balanced policy which tries to balance the received SNR of each user by serving a weaker user with higher transmission power. Then, we establish the equivalence of the power-balanced policy and the Pareto optimal policy which yields a throughput vector at the boundary of the capacity region. This enables to characterize the capacity region explicitly, and also renders an easy means to maximize the total throughput while meeting each user's requirement.

Published in:

IEEE International Conference on Communications, 2005. ICC 2005. 2005  (Volume:4 )

Date of Conference:

16-20 May 2005