Channel Gain Survey

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Channel Gain Survey

  1. 1. Channel gain survey 報告者 : 李杰修 指導教授 : 劉宏煥
  2. 2. References <ul><li>Ki-Dong Lee and Victor C. M. Leung, </li></ul><ul><li>“ capacity planning for group-mobile user in OFDMA wireless networks,” EURASIP Journal. Wireless Communications and Networking, vol. 2006, pp. 1-12. </li></ul><ul><li>Zhu ji, K.j. Ray Liu, “Fair Multiuser channel allocation for OFDMA Networks Using Nash Bargaining Solutions and Coalitions,” IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 53 NO. 8, AUGUST 2005. </li></ul><ul><li>Seong Taek Chung, Andrea J. Goldsmith, “Degrees of Freedom in Adaptive Modulation : A Unified View,” IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 49 NO. 9, </li></ul><ul><li>SEPTEMBER 2001. </li></ul>06/02/09
  3. 3. Outline <ul><li>Introduction </li></ul><ul><li>System model </li></ul><ul><ul><li>Cost function </li></ul></ul><ul><ul><li>Parameter matrix </li></ul></ul><ul><ul><li>Bit-error rate(BER) </li></ul></ul><ul><ul><li>Transmission rate </li></ul></ul><ul><li>Simulation result </li></ul><ul><li>Conclusion && future work </li></ul>06/02/09
  4. 4. Introduction Planned admission capacity should be adjust with channel gain 06/02/09
  5. 5. Introduction(cont) 06/02/09 Depend on channel gain choose multi-subcarrier for multi-user
  6. 6. Cost function 06/02/09 K : user number N : subcarrier number
  7. 7. Cost function(cont) <ul><li>i user transmission rate </li></ul><ul><li>Subcarrier-assignment matrix </li></ul><ul><li>[A] ij = a ij (i user, j subcarrier) </li></ul>06/02/09 i : user j : subcarrier N: subcarrier number
  8. 8. Bit-error rate(BER) of MQAM <ul><li>ith user SNR at jth subcarrier </li></ul><ul><li> P : power </li></ul><ul><li>G : channel gain </li></ul><ul><li>σ : noise power </li></ul><ul><li>Bit-error rate(BER) of MQAM </li></ul><ul><li> C1 = 0.2 </li></ul><ul><li> C2 = 1.5 </li></ul>06/02/09 2 ij ij
  9. 9. Transmission rate 06/02/09 ij W :Subcarrier bandwidth
  10. 10. Simulation result 06/02/09
  11. 11. Simulation result(cont) 06/02/09
  12. 12. Simulation result(cont) 06/02/09
  13. 13. Average rate per connection <ul><li>Achievable rate of user j using subcarrier i </li></ul><ul><li>Average rate per connection when y connections are ongoing as follows </li></ul>06/02/09
  14. 14. Channel gain <ul><li>Discrete-time channel with stationary and ergodic time-varying gain </li></ul>06/02/09
  15. 15. Conclusions <ul><li>We need “transmission rate” to planned admission control scheme </li></ul><ul><li>“ Channel gain” is the necessary parameter for compute transmission rate </li></ul>06/02/09
  16. 16. Future work <ul><li>Channel gain </li></ul><ul><ul><li>flat Rayleigh fading model </li></ul></ul><ul><ul><li>Jakes model </li></ul></ul><ul><ul><ul><li>Autocorrelation channel gain </li></ul></ul></ul>06/02/09

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