A Robust Demodulator for OQPSK–DSSS System

A Robust Demodulator for OQPSK–DSSS System
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用于 OQPSK™ DSSS 系统的鲁棒解调器

DOI:
10.1007/s00034-014-9844-z
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发表时间:
2014-07
期刊:
Circuits, Systems, and Signal Processing
影响因子:
--
通讯作者:
W. Xiang
W. Xiang
中科院分区:
其他
文献类型:
--
作者:
S. Dai;H. Qian;K. Kang;W. Xiang

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IEEE802.15.4标准已迅速成为物联网时代的标杆。IEEE802.15.4标准的2.4 GHz物理层强制模式采用直接序列扩频(DSSS)偏置正交相移键控(OQPSK)调制。传统的差分解调器的性能不能令人满意。相干解调器易受初始相位失配或频率偏移的影响。本文提出了一种用于OQPSK-DSSS系统的新型非相干解调器。所提出的解调器对初始相位失配和频率偏移具有较强的鲁棒性。在加性高斯白噪声信道中,当信噪比为1.3 dB时,该解调器在1%的包错误率下实现了目标灵敏度。仿真结果证明了该解调方法的有效性和鲁棒性。
IEEE802.15.4 standard has quickly become a benchmark in the era of Internet of things. The mandatory mode of 2.4 GHz physical layer of IEEE802.15.4 standard employs offset quadrature phase shift keying (OQPSK) modulation with direct sequence spread spectrum (DSSS). The performance of conventional differential demodulator is not satisfactory. The coherent demodulator is vulnerable to initial phase mismatch or frequency offset. In this paper, we propose a new non-coherent demodulator for the OQPSK–DSSS system. The proposed demodulator is robust against initial phase mismatch and frequency offset. At1.3 dB SNR in additive white Gaussian noise channel, the proposed demodulator achieves the target sensitivity at 1 % packet error rate. Simulation results demonstrate the effectiveness and robustness of the proposed demodulator.
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发表时间: 2007-04
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