Title :
Subcarrier and power allocation for an OFDMA uplink based on tap correlation information
Author :
Yoon, Eunchul ; Tujkovic, Djordje ; Paulraj, Arogyaswami
Author_Institution :
Lab. of Inf. Syst., Stanford Univ., CA, USA
Abstract :
The impact of tap correlation on the achievable average sum rate of an OFDMA uplink is investigated. Tap correlation between channel taps was showed to reduce the average sum rate of an OFDMA uplink. However, if available subcarriers and power are allocated to multiusers based on their tap correlation information, a hefty portion of inherent multiuser diversity can be exploited in a cost effective manner leading to substantial improvement in spectral efficiency compared with uniform subcarrier and power allocation. The performance gain of such statistical adaptation is further investigated as a function of the number of simultaneously scheduled users per OFDM symbol.
Keywords :
channel allocation; diversity reception; frequency division multiple access; multiuser channels; radio links; statistical analysis; OFDMA uplink; channel taps; multiuser diversity; power allocation; statistical adaptation; subcarrier allocation; tap correlation information; Bandwidth; Bit error rate; Costs; Downlink; Feedback; Frequency conversion; OFDM; Performance gain; Throughput; Wireless communication;
Conference_Titel :
Communications, 2005. ICC 2005. 2005 IEEE International Conference on
Print_ISBN :
0-7803-8938-7
DOI :
10.1109/ICC.2005.1494847
