A New Multiple-Symbol Differential Detection Strategy for Error-Floor Elimination of IEEE 802.15.4 BPSK Receivers Impaired by Carrier Frequency Offset

Abstract

In this paper, we pay our attention towards the noncoherent demodulation aspect of binary phase shift keying (BPSK) receivers for IEEE 802.15.4 wireless sensor networks (WSNs), and a carrier frequency offset invariant as well as error-floor free multiple-symbol differential detection (MSDD) strategy is proposed over the flat fading channel. This detector is an alternative to the multiple-symbol detector that has been considered almost exclusively in the past. In this new configuration, the receivers do not perform chip-level precompensation as in conventional scheme but bit-level postcompensation. That is, the bit-level autocorrelation operation is first implemented with the “raw” chip sample, and then the carrier frequency offset effect (CFOE) embedded in the achieved statistic is compensated. Correspondingly, the cumulative error in the detection metric is decreased so much that the pervasive error floor for the conventional MSDD scheme is suppressed. Also, complexity efficient estimators for the MSDD scheme are reinvestigated, analyzed, and summarized. Simulation results demonstrate that this new detection strategy may achieve rather more encouraging gain from differential and spread spectrum coding than the conventional single differential coherent detection (SDCD) scheme. The pervasive error floor is also eliminated as compared with conventional MSDD scheme even if the most simple estimator is configured under large bit observation length. Then, much transmitting energy may be saved for each chip symbol, which is practically desired for transmit-only nodes in WSNs.

Reduced-Complexity Multiple-Symbol Detection of O-QPSK Signals in Smart Metering Utility Networks

“…In this work, based on a heuristic idea, we proposed a simplified CFOE estimation algorithm inspired by the previous work of Michael P. Fitz [20] and G.Y. Zhang et al [29]. The detailed algorithm structure is shown in Figure 2, whose particular procedure is as follows.…”

“…Therefore, it is significant to decrease the complexity of MSD scheme. In recent years, scholars have proposed various algorithms to solve this problem [18][19][20][21][22][23][24][25][26][27][28][29]. The main related work is as follows.…”

“…Furthermore, G.Y. Zhang et al proposed a novel and low-complexity MSD scheme with the aid of preamble, which is verified to be valid in the IEEE 802.15.4 BPSK receivers [28][29][30]. Thus, it is imperative to develop an implementation-friendly MSD scheme for the IEEE 802.15.4g O-QPSK receiver.…”

Characteristics of Rain-Induced Attenuation over Signal Links at Frequency Ranges of 25 and 38 GHz Observed in Beijing

“…The fifth-generation cellular networks (5G) have been rapidly deployed worldwide, and millimeter-wave communication is one of its key enabling technologies. Millimeterwave has a great advantage in high-capacity and high-speed communication due to its large available bandwidth [1][2][3]. Data rates in microwave frequencies and below are limited to about 1 Gb/s, but they can reach 10 Gb/s and more in the millimeter-wave range.…”

Rainfall Monitoring Based on Next-Generation Millimeter-Wave Backhaul Technologies in a Dense Urban Environment

“…The most powerful impact is expected in developing countries and regions where no other measurements currently exist. Making use of the existing commercial wireless networks is equivalent to deploying a very high density of weather monitoring sensors and forming wireless environmental sensor networks (WESN) [30,33] all over the world.…”