Successive Interference Cancellation of ICA Based SDMA Differential Detector for BLE Systems

Abstract

This paper proposes a successive interference cancellation (SIC) of independent component analysis (ICA) based spatial division multiple access (SDMA) differential detector for Bluetooth low energy (BLE) systems. Typical SDMA scheme requires estimations of channel state information (CSI) using orthogonal pilot sequences. However, the orthogonal pilot is not embedded in the BLE packet. This fact motivates us to apply ICA detector into BLE. In this case, there are three problems to be addressed. First, ICA requires a lot of samples for maintaining the accuracy of signal separation capability. Then, ICA suffers from phase ambiguity. Finally, noise enhancements are caused by ICA detector. To deal with all problems, we propose a unified design of ICA, differential detector, and SIC for SDMA of BLE. Regarding the packet error rate (PER) performance, computer simulations validate the proposed design.