Title :
Performance of Downlink Schedulers with Superposed or Orthogonal Transmissions
Author :
Agustin, Adrian ; Vidal, Josep ; Muñoz, Olga Mu
Author_Institution :
Dept. of Signal Theor. & Commun., UPC, Barcelona, Spain
Abstract :
This work looks into the extension of the proportional fair (PF) scheduler to the multi-user case, where the source is transmitting several messages under the superposition coding (SC) strategy in a Gaussian Broadcast channel. Jointly with the weighted sum-rate (WSR) scheduling criterion, we derive guidelines for 2-user pairing, based both on SNR and user priority. We compare superposition coding access with frequency division multiple access, while time division is obtained naturally as a result of the user pairing. Results elucidate that the 2-user SC PF always improves the single-user PF in terms of average throughput and delay reduction, and we compare its performance with the 3-user SC PF. Finally, the WSR shows throughput gains similar to the 2-user SC PF for certain configuration of the scheduler.
Keywords :
Gaussian channels; broadcast channels; radio networks; scheduling; 2-user pairing; Gaussian broadcast channel; SNR; downlink schedulers; frequency division multiple access; orthogonal transmission; proportional fair scheduler; superposed transmission; superposition coding access; user priority; weighted sum-rate scheduling; Antenna measurements; Bit rate; Broadcasting; Communications Society; Downlink; Meteorological radar; Resource management; Signal to noise ratio; Throughput; Time division multiple access;
Conference_Titel :
Communications (ICC), 2010 IEEE International Conference on
Conference_Location :
Cape Town
Print_ISBN :
978-1-4244-6402-9
DOI :
10.1109/ICC.2010.5502466