Successive Interference Cancellation of ICA-Aided SDMA for GFSK Signaling in BLE Systems

Masahiro TAKIGAWA  Shinsuke IBI  Seiichi SAMPEI  

IEICE TRANSACTIONS on Communications   Vol.E103-B   No.5   pp.495-503
Publication Date: 2020/05/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2019EBP3088
Type of Manuscript: PAPER
Category: Fundamental Theories for Communications
successive interference cancellation,  independent component analysis,  spatial division multiple access,  differential detector,  Bluetooth low energy,  

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This paper proposes a successive interference cancellation (SIC) of independent component analysis (ICA) aided spatial division multiple access (SDMA) for Gaussian filtered frequency shift keying (GFSK) in Bluetooth low energy (BLE) systems. The 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 add ICA detector into BLE systems. In this paper, focusing on the covariance matrix of ICA outputs, SIC can be applied with Cholesky decomposition. Then, in order to address the phase ambiguity problems created by the ICA process, we propose a differential detection scheme based on the MAP algorithm. In practical scenarios, it is subject to carrier frequency offset (CFO) as well as symbol timing offset (STO) induced by the hardware impairments present in the BLE peripherals. The packet error rate (PER) performance is evaluated by computer simulations when BLE peripherals simultaneously communicate in the presence of CFO and STO.