Subcarrier allocation and power control for OFDMA
34th Asilomar Conference, Pacific Grove, CA, United States Of America, 29 October - 01 November 2000, vol.1, pp.147-151, (Full Text)
- Publication Type: Conference Paper / Full Text
- Volume: 1
- City: Pacific Grove, CA
- Country: United States Of America
- Page Numbers: pp.147-151
- Keywords: Multiuser, OFDM, OFDMA, Power control, Waterfilling
- Yıldız Technical University Affiliated: Yes
Abstract
In this paper, we study the problem of finding an optimal sub-carrier and power allocation strategy for downlink communication to multiple users in an OFDM based wireless system. We formulate the problem of minimizing total power consumption with constraints on BER and transmission rate for users requiring different classes of service, and derive simple algorithms which perform well. We divide larger problem of joint allocation into two steps. In the first step, the number of subcarriers that each user will get is determined based on the users' average SNR. Numerical results demonstrate that the proposed low complexity algorithms offer comparable performance with an existing iterative algorithm [6].