Outline Problem Description Literature Review Contribution System Model Constrained Po.pdf

Rate Constrained Power Control in Space-Time Coded Fading Ad-Hoc Networks Homayoun Yousefi’zadeh Lynn Zheng Hamid Jafarkhani Department of EECS, UCI [hyousefi, llzheng,hamidj]@ Outline ? Problem Description ? Literature Review ? Contribution ? System Model ? Constrained Power Optimization ? Simulation Results ? Conclusions Description and Contributions ? Minimize power consumption of wireless ad-hoc networks with multiple antenna nodes under throughput and QoS provisioning constraints ? Modeling the MIMO fading channel. ? Integrating a finite- sate MC model into power minimization problem of ad-hoc networks without incurring prohibitive overhead. ? Solving the problem with low complexity ? Investigating mobility effects. SINR Model ? Instantaneous SINR for an link i with transmission power is defined as ? captures factors such as path loss, shadowing, and antenna gain. is the fading factor between transmitting antenna m of link j and receiving antenna n of link i. ( ) ( ) 1 1 ( ) ( ) 1 1 ( ) ( ) ( ) ( ) ( ) ( ) i ii i j ij j M NP t m n ii iiM m n i M NP t m n ij ij i iMj i m n G t F t SINR t G t F t N n t , = = , ≠ = = = + ∑ ∑ ∑ ∑ ∑ ( )ijG t ( )( )m nijF t , i iM N× iP Assumptions ? Time shift correlations of fading factors over the same links are temporally correlated ? Time shift correlations of fading factors over different links are i.i.d ? Distribution of the white Gaussian noise is independent from the fading distributions ? ’s have unit means so long as ’s are appropriately scaled ? Wireless channel varies slowly with respect to the symbol interval. ijF ijG Digital Channel Description ? Previously, we modeled the analog fading channel with a finite state MC. ? Gilbert-Elliott Error Model l Transition probabilities from Rayleigh stats l SER is a function of SINR, M, and N , , G B G B P P SER SER γ β= = Reception Probabilities ? What is the prob. of receiving exactly