Implementation-friendly and Energy-efficient Symbol-by-symbol Detection Scheme for IEEE 802.15.4 O-QPSK Receivers

• Published in: IEEE access Vol. 8; p. 1
• Main Authors: Zhang, Gaoyuan, Shi, Congyu, Han, Congzheng, Li, Xingwang, Wang, Dan, Rabie, Khaled M. Rabie Khaled, Kharel, Rupak
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01.01.2020; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Carrier frequencies; Codes; IEEE 802.15.4 wireless sensor networks; Internet of Things; offset QPSK; Quadrature phase shift keying; Random noise; Receivers; Sensors; Service life; Spread spectrum; symbol-by-symbol detection; Wireless networks; Wireless sensor networks
• ISSN: 2169-3536; 2169-3536
• DOI: 10.1109/ACCESS.2020.3020183

In this paper, the noncoherent detection scheme for the receiver in wireless sensor nodes is discussed. That is, an implementation-friendly and energy-efficient symbol-by-symbol detection scheme for IEEE 802.15.4 offset-quadrature phase shift keying (O-QPSK) receivers is investigated under both pure additive white Gaussian noise (AWGN) channel and fading channel. Specifically, the residual carrier frequency offset (CFO) of the chip sample is estimated and compensated with the aid of the preamble; then, the standard noncoherent detection scheme with perfectly known CFO is directly configured. The corresponding simulation results show that only 4 preamble symbols is sufficient for accurate CFO estimation. Compared with the conventional noncoherent detector, the average running time per data packet of our enhanced detector is only 0.17 times of the former; meanwhile, at the packet error rate of 1 × 10⁻³, our enhanced detector can obtain 2.2 dB gains in the (32, 4) direct sequence spread spectrum system. A more reasonable trade-off between complexity and reliability is thus achieved for energy-saving and maximum service life in wireless sensor networks (WSNs).