Energy and Location Optimization for Relay Networks with Differential Modulation
Abstract
In wireless networks, relay transmissions can enable cooperative diversity by forming virtual antenna arrays. The optimum resource allocation in such relay networks is critical to enhance their performance and efficiency. However, existing works on resource optimization only consider single-relay systems and focus on the power allocation. In this paper, we consider both the power optimization and the location optimization for systems with arbitrary number of relays. Equally attractive is that our investigation is tailored for differential modulations, which bypass the channel estimation at the receiver and are particularly suitable for wireless relay networks. We first derive an upper bound of the error performance. Based on this bound, we then develop the optimum energy and distance allocation schemes that minimize the average system error. Analytical and simulated comparisons confirm that the optimized systems provide considerable improvement over un-optimized ones. In addition, we show that location optimization may be more critical than energy optimization.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 2006
- Accession Number
- ADA481690
Entities
People
- Liuqing Yang
- Woong Cho
Organizations
- University of Florida