Synchronization in IEEE 802.15.4 Zigbee transceiver using Matlab Simulink

Abstract

Zigbee standard has all set of protocols which supports low data rate, low power consumption, low cost and short range communications. The main application of Zigbee is Wireless Sensor Networks(WSNs). In digital communications, data is being transmitted by converting input bit stream in to sample functions of analog waveforms. When the analog RF signal passes through bandlimited channel, it results signal degradation in terms of symbol delay, carrier frequency and phase offsets. Various synchronization techniques can be used to estimate these characteristics in coherent receivers. In this paper, phase offset can be estimated using costas loop carrier recovery circuit and early late gate timing recovery algorithm is used to estimate symbol timing before data being decoded. The receiver performs well for different SNR (Signal to Noise Ratio) values varying from -10dB to 14dB. Transceiver system design is developed using Matlab Simulink and its performance can be analysed when it undergoes through Additive White Gaussian Noise (AWGN) channel and Rayleigh fading channel.Index Terms-Costas loop carrier recovery, Early late gate timing recovery, IEEE 802.15.4, LR-WPAN, Zigbee transceiver.

Blind symbol timing offset estimation for offset‐QPSK modulated signals

“…The second approach is the non‐data–aided structure, which exploits the statistics of the received signal for the estimation, and is also known as blind estimation . Some of the non‐data–aided classical STO estimations are the early‐late gate algorithm , Mueller and Muller algorithm , and Gardner algorithm .…”