Cui Xiaowei

A model based on congestion pricing for QoS

Fairness of resource allocation scheme is very important for realizing quality of service (QoS) in Internet. However, the current scheme implementing TCP protocol is unfair for the users with different round trip times (RTTs). In this paper; we introduce a new model based on dynamic congestion price that can guarantee fairness of allocating resource between users with different RTTs. Thereby, the scheme on this model can provide differential services easily.

Power allocation between layers in multilayered space-time coding

Multilayered space-time coded modulation is an approach of combining array processing and space-time coding. Because different coded layers have different diversity gain, so unequal power levels should be allocated to the different coded layers for achieving best performance. This paper transforms the power allocation problem into two standard optimization problems. Simulation results demonstrate that new power allocation is 2/spl sim/2.5 dB better than equal power manner and 0.5/spl sim/1 dB better than experimental scheme in Tarokh et al. [May 1999].