NDA SNR Estimation with Phase Lock Detector for Digital QPSK Receivers

Author

Wang, Hua ; Yan, Chaoxing ; Kuang, Jingming ; Wu, Nan ; Fei, Zesong ; Zheng, Meng

Author_Institution

Dept. of Electron. Eng., Beijing Inst. of Technol., Beijing, China

fYear

2010

fDate

16-19 May 2010

Firstpage

1

Lastpage

5

Abstract

In this paper, based on analyzing some existing phase lock detectors for quadratic phase-shift keying (QPSK),we propose a novel method of estimating the signal-to-noise ratio (SNR) operating with the lock metric value of classical Mth-power (M=4) phase lock detector. The proposed lock detector-based SNR estimator can perform better than the conventional SNR estimator in terms of mean estimated value (MEV) at medium to high SNR when phase recovery loop is in-lock status. And its normalized mean squared error (NMSE) can reach Cramer-Rao bounds (CRBs) at that SNR. Moreover, the computational complexity of new estimator operating in phase recovery loop is analyzed with less additional multiplications than that of conventional one. This estimation method can also be applied to other similar phase lock detectors.

Keywords

mean square error methods; quadrature phase shift keying; radio receivers; Cramer-Rao bounds; NDA SNR estimation; digital QPSK receivers; mean estimation value; normalized mean square error; phase lock detector; quadratic phase shift keying; signal-to-noise ratio; Chaotic communication; Computational complexity; Detectors; Phase detection; Phase estimation; Phase locked loops; Phase shift keying; Quadrature phase shift keying; Signal analysis; State estimation;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference (VTC 2010-Spring), 2010 IEEE 71st

Conference_Location

Taipei

ISSN

1550-2252

Print_ISBN

978-1-4244-2518-1

Electronic_ISBN

1550-2252

Type

conf

DOI

10.1109/VETECS.2010.5493907

Filename

5493907