Collision Resolve for Datalink Random Access Based on Multi-Packet Reception

In order to solve the inevitable data collision in competitive datalink random access of wireless sensors networking, this paper provides a blind property restoral maximum likelihood (ML) approach for demodulating multiple co-channel digital signals received synchronously at an antenna array. The finite alphabet property of digital signal combining with ML is analyzed, the array response and symbol sequence for each signal simultaneously are also estimated, which can obtain better approximation to the system performance of initial time-delay and throughput. Such works are confirmed by computer simulation and field-testing data verification.