NDLI: NDA SNR estimation for 32APSK in AWGN

Content Provider	IEEE Xplore Digital Library
Author	Das, A. Ng, J.
Copyright Year	2008
Description	Author affiliation: Sch. of Electr. & Comput. Eng., Univ. of California, San Diego, CA (Ng, J.) \|\| ViaSat Inc., Carlsbad, CA (Das, A.)
Abstract	32-amplitude and phase-shift-keying (32APSK) is one of the modulation schemes proposed in the 2nd generation digital video broadcasting over satellite (DVB-S2) standard. This paper presents a non-data-aided (NDA) SNR estimation scheme for 32APSK using the expectation-maximization (EM) algorithm. Two variants of the EM algorithm are presented, first with an arbitrary initialization and a second version that is initialized by modifying an existing (sub-optimal) SNR estimation technique. We demonstrate a significantly faster convergence with the latter form of initialization. We compare the performance of this estimator to the Cramer-Rao lower bound (CRLB) of NDA SNR estimation and show that the estimator performs very close to the CRLB over all SNRs of practical interest even for block sizes of 100 symbols. The estimator has also been implemented on FPGAs and we show that the fixed point implementation also performs very close to the theoretical limit.
Starting Page	331
Ending Page	335
File Size	3300691
Page Count	5
File Format	PDF
ISBN	9781424420452
DOI	10.1109/SPAWC.2008.4641624
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-07-06
Publisher Place	Brazil
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Signal to noise ratio Estimation Field programmable gate arrays Hardware Gain Channel estimation Digital video broadcasting EM Algorithm 32APSK DVB-S2 NDA SNR Estimation
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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