In this thesis, noncoherent differential demodulation of CPM signals with joint
carrier frequency offset and symbol timing estimation is investigated. CPM is very
attractive for wireless communications owing to major properties: good spectral
efficiency and a constant envelope property. In order to demodulate the received
CPM signal differentially, the symbol timing and the carrier frequency offset have
to be estimated accurately. There are numerous methods developed for the
purpose. However, we have not encountered studies (which are based on autocorrelation
estimation and hence suitable for blind synchronization) that give
expectable performance for both M-ary and partial response signaling. Thus, in
this thesis we analyze a feedforward blind estimation scheme, which recovers the
symbol timing and the frequency offset of M-ary CPM signals and partial response
CPM signals. In addition, we surveyed low complexity symbol detection methods
for CPM signals. Reduced state Viterbi differential detector incorporated to the
joint frequency offset and symbol timing estimator is also examined. The
performance of the examined demodulator scheme is assessed for the AWGN
channel by computer simulations.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12613729/index.pdf |
| Date | 01 October 2011 |
| Creators | Culha, Onur |
| Contributors | Tanik, Yalcin |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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