Event Details
Performance Analysis of Greedy Subchannel Allocation Schemes for Adaptive OFDMA Systems
Presenter: Nan Lv
Supervisor: Dr. H.-C. Yang
Date: Fri, July 23, 2010
Time: 11:00:00 - 12:00:00
Place: EOW 430
ABSTRACT
Abstract
Subchannel allocation schemes for OFDMA systems with adaptive transmission are investigated. The analysis involves two scenarios: single-hop transmission and dual-hop relaying transmission. The overall objective is to utilize minimum system resource (in terms of subchannel) while satisfying scheduled users' data rate requirements under a certain error rate performance restriction. The ordered subchannel selection with adaptive modulation scheme is applied to both cases.
In single-hop case, a low-complexity greedy subchannel allocation algorithm with two options is proposed, depending on whether a common modulation mode is applied on all selected subchannels or not.
In dual-hop relaying case, two relaying schemes are considered: Amplified-and-Forward (AF) and Decode-and-Forward (DF). Based on this, four different combinations of relaying schemes and ordered subchannel selection with adaptive modulation scheme are investigated.
For both single-hop and dual-hop relaying case, performances of different proposed schemes are evaluated through mathematical analysis and compared with selected numerical results.