Wireless Cooperative Networks: Self-Configuration and Optimization
Abstract
Cooperative signal processing is a promising technique to enhance system performance by employing virtual antenna arrays. In communications, cooperative transmission exploits space diversity via spatially separated relay nodes. Performance of such systems can be further improved by resource optimization. In this research, the authors investigated various factors influencing resource optimization solutions and results in terms of system error performance and throughput. Partly inspired by the benefits of cooperative communication, cooperative sensing has been drawing increasing interest of late. In such systems, a particularly critical issue is waveform optimization among the cooperative nodes. In this direction, the authors have developed the optimum and robust waveform designs, and have established the intrinsic connections between the mutual information (MI) and mean square error (MSE) measures in the sensing context. Sensitivity analysis for the optimum designs also was carried out. Specifically, the authors investigated the resource optimization problem in cooperative communications for four commonly adopted relaying systems: the amplify-and-forward (AF) protocol with coherent or differential modulation, and the decode-and-forward (DF) protocol with coherent or differential modulation. The closed-form symbol error rate (SER) and outage probability (OP) performances are derived for all four systems. Based on their previous work, they know that the location optimization is an important technique for system performance improvement. Therefore, location optimization is carried out for all four cooperative systems using both SER and OP optimization metrics. The comparisons among the optimization solutions and results for all four systems with both metrics revealed the influence of different system parameters, which can be used to guide the optimization strategy selection in practice.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 2009
- Accession Number
- ADA514715
Entities
People
- Liuqing Yang
- Roslyn S. Oleson
Organizations
- University of Florida