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A Robust Demodulator for OQPSK–DSSS System

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Abstract

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. At \(-\)1.3 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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Acknowledgments

This work was supported in part by the 100 Talents Program of Chinese Academy of Sciences, the National Natural Science Foundation of China (No. 61231009), and the Innovation Foundation of Shanghai Science and Technology (No. 11DZ1500201).

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Authors and Affiliations

  1. Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences (CAS), Shanghai, 200050, China

    Shengchen Dai, Hua Qian & Kai Kang

  2. Shanghai Research Center for Wireless Communications, Shanghai, 200335, China

    Shengchen Dai, Hua Qian & Kai Kang

  3. Key Laboratory of Wireless Sensor Network and Communication, SIMIT, CAS, Shanghai, 200050, China

    Shengchen Dai, Hua Qian & Kai Kang

  4. Electrical and Computer Engineering Department, University of Michigan, Dearborn, Dearborn, 48128, MI, USA

    Weidong Xiang

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  1. Shengchen Dai
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  2. Hua Qian
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  3. Kai Kang
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  4. Weidong Xiang
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Correspondence to Hua Qian.

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Dai, S., Qian, H., Kang, K. et al. A Robust Demodulator for OQPSK–DSSS System. Circuits Syst Signal Process 34, 231–247 (2015). https://doi.org/10.1007/s00034-014-9844-z

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  • DOI: https://doi.org/10.1007/s00034-014-9844-z

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