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FUNDAMENTAL CROSS-LAYER APPROACH TO WIRELESS NETWORKS

FUNDAMENTAL CROSS-LAYER APPROACH TO WIRELESS NETWORKS. Prof. Edmund Yeh Jian Cao Yufang Xi Nov. 18, 2003. MAIN CHALLENGES IN WIRELESS COMMUNICATIONS. Fading Multi-user interference Power/energy limitation Randomly varying traffic Distributed implementation. BASIC APPROACH.

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FUNDAMENTAL CROSS-LAYER APPROACH TO WIRELESS NETWORKS

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  1. FUNDAMENTAL CROSS-LAYER APPROACH TO WIRELESS NETWORKS Prof. Edmund Yeh Jian Cao Yufang Xi Nov. 18, 2003

  2. MAIN CHALLENGES IN WIRELESS COMMUNICATIONS • Fading • Multi-user interference • Power/energy limitation • Randomly varying traffic • Distributed implementation

  3. BASIC APPROACH • Cohesive cross-layer framework • Fundamental limits and insights • Joint power control, rate allocation, routing, to maximize throughput and minimize delay

  4. CELLULAR NETWORKS Uplink Base Station Downlink

  5. RESOURCE ALLOCATION FOR UPLINK AND DOWNLINK Packets Transmitter 1 R1(t), P1(t) Transmitter 2 Packets R2(t), P2(t) Transmitter N Packets RN(t), PN(t) Fading State Queue State at time t Controller

  6. MULTI-HOP WIRELESS NETWORKS Source 1 Destination 2 Source 2 Destination 1

  7. RESOURCE ALLOCATION FORMULTI-HOP WIRELESS NETWORKS A21(t) H24(t) 2 4 Ai1(t) pij,rij V1 H12(t) Ai2(t) A11(t) 5 1 H13(t) pim,rim A12(t) H35(t) V2 AiK(t) 3 6 H36(t) A31(t)

  8. FUTURE DIRECTIONS • Distributed implementations • Multiple antennas • Delay optimization

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