Title :
Performance Analysis of MPSK Phase Detectors for Carrier Synchronization PLLs at Low SNRs
Author :
Wei Jiang ; Yifei Cui
Author_Institution :
State Key Lab. of Adv. Opt. Commun. Syst. & Networks, Peking Univ., Beijing, China
Abstract :
In this letter, we analyze the performance of a category of phase detectors (PDs) for carrier synchronization phase-locked loops (PLLs) in M-ary phase shift keying (MPSK) receivers working at low signal-to-noise ratios (SNRs). These PDs have the property that their outputs are functions of the inputs´ phase only, and thus, their performance is independent of the automatic gain control (AGC) circuits. We deduce closed-form expressions about the linearized gain and equivalent noise variance of these PDs when SNR goes to zero and sum up simple approximate formulas for three typical PDs at all SNRs. We also prove that the modified Mth-power PD performs asymptotically best in this category of PDs as SNR goes to zero.
Keywords :
automatic gain control; phase detectors; phase locked loops; phase shift keying; radio receivers; synchronisation; telecommunication control; AGC circuits; M-ary phase shift keying receivers; MPSK phase detectors; MPSK receivers; Mth-power PD; SNR; automatic gain control circuits; carrier synchronization PLL; carrier synchronization phase-locked loops; closed-form expressions; equivalent noise variance; signal-to-noise ratios; Approximation methods; Detectors; Performance evaluation; Phase locked loops; Signal to noise ratio; Synchronization; Carrier synchronization; MPSK; PLL; carrier synchronization; equivalent noise variance; linearized gain; low SNR; phase detector;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2014.2363468
