A Novel Implementation of DOA Estimation for Node Localization on Software Defined Radios: Achieving High Performance with Low Complexity

This paper introduces a novel implementation of direction-of-arrival (DOA) estimation for localization of nodes in (mobile) ad-hoc networks. The localization technique is being implemented on a software defined radio (SDR) system. The SDR system needs DOA estimation for: (a) beam-forming and detection, and (b) localization. The detection process needs coarse DOA estimation, while the localization needs a fine one. The technique fuses two known DOA estimation techniques: delay-and-sum and root-MUSIC. The former is a simple technique suitable for on-line (high speed) implementation required for detection. Hence, it would consume less power. The latter is a complex technique that needs higher processing time and consumes more power and would be suitable for off-line DOA estimation. Hence, the fused DOA estimation technique offers high performance with low complexity and power consumption.