Abstract
We consider scheduling and resource allocation for the downlink of a cellular OFDM system, with various practical considerations including integer tone allocations, different sub-channelization schemes, maximum SNR constraint per tone, and self-noise#x201D; due to channel estimation errors and phase noise. During each time-slot a subset of users must be scheduled, and the available tones and transmission power must be allocated among them. Employing a gradient-based scheduling scheme presented in earlier papers reduces this to an optimization problem to be solved in each time-slot. Using a dual formulation, we give an optimal algorithm for this problem when multiple users can time-share each tone. We then give several low complexity heuristics that enforce integer tone allocations. Simulations are used to compare the performance of different algorithms.
| Original language | English (US) |
|---|---|
| Article number | 4786509 |
| Pages (from-to) | 288-296 |
| Number of pages | 9 |
| Journal | IEEE Transactions on Wireless Communications |
| Volume | 8 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 1 2009 |
Keywords
- Cellular downlink
- Nonlinear optimization
- Orthogonal frequency division multiplexing (OFDM)
- Resource allocation
- Scheduling
- WiMax
- Wireless communications
ASJC Scopus subject areas
- Computer Science Applications
- Electrical and Electronic Engineering
- Applied Mathematics