Bayesian Data Fusion for Asynchronous DS-CDMA Sensor Networks in Rayleigh Fading

Abstract— In this paper, we propose asynchronous non-orthogonal communication between distributed sensors and a data fusion center via asynchronous direct-sequence code-division multiple access (DS-CDMA). Furthermore, we evaluate the performance of such a system in the presence of local-sensor and channel errors due to multiple-access interference (MAI) and noise. We derive the optimal Bayesian receiver for this system operating over both a simple AWGN channel and a Rayleighfading channel, assuming full knowledge of the channel fading coefficients. The optimal receiver is shown to have exponential complexity as a function of the number of sensors. A set of lowcomplexity partitioned receivers are then proposed and analyzed in relation to the optimal one. These partitioned receivers are based on well-known linear and nonlinear multiuser detectors for DS-CDMA. The synchronous DS-CDMA case was studied in [1], and it is shown here that the degradation induced by moving to an asynchronous...

• Type: Conference
• Year: 2006
• Where: GLOBECOM
• Authors: Justin S. Dyer, Balasubramaniam Natarajan, Sudharman K. Jayaweera
• Keywords: Asynchronous Non-orthogonal Communication, GLOBECOM 2006, Optimal Bayesian Receiver, Optimal Receiver, Telecommunications