Multicarrier multiple access with channel knowledge and prescribed power at the transmitters is shown to maximize the sum-rate for circulant intersymbol-interference (ISI) channels. A low-complexity iterative algorithm is derived for optimal subcarrier allocation to multiple users, while power is loaded per user by specializing an existing iterative algorithm to circulant ISI channels. It is analytically shown that each subcarrier should be allocated to the user having relatively better subcarrier gain and that different users may share certain subcarriers.
Bibliographical noteFunding Information:
Manuscript received April 1, 2005; revised October 1, 2005. This work was supported in part by the National Science Foundation under Grant 0105612. This paper was presented in part at the International Conference on Communications, New York, April 28–May 2, 2002.
- Channel capacity
- Intersymbol interference
- Multicarrier transmission
- Multiple access