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Joint oversampled carrier and time-delay synchronization in digital communications with large excess bandwidth

Abstract : This paper deals with the joint estimation of the pair dynamical carrier phase/Dopplershift and the time-delay in a digital receiver. We consider a Binary Offset Carrier shaping function as used in satellite positioning, which is a time-limited pulse with a large excess bandwidth, and a Data Aided synchronization scenario, where we have a constant time-delay and a Brownian phase evolution with a linear drift. The proposed study is relative to the use of an oversampled signal model after matched filtering, leading to a colored reception noise and a non-stationary power signal. The contribution of this paper is twofold. First, we derive the Hybrid Crame'r-Rao Bound for the joint phase/Doppler estimation problem. Then, we propose a method for the joint timedelay/carrier synchronization, which couples an Extended Kalman Filter and an Expectation-Maximization type algorithm. Our numerical results show the potential gain of using the oversampled signal for carrier synchronization, obtaining better performances than using a classical synchronizer, and good time-delay estimation.
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https://hal.archives-ouvertes.fr/hal-00617911
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Submitted on : Tuesday, August 30, 2011 - 8:56:49 PM
Last modification on : Thursday, July 9, 2020 - 5:02:09 PM
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Jordi Vilà Valls, Laurent Ros, Jean-Marc Brossier. Joint oversampled carrier and time-delay synchronization in digital communications with large excess bandwidth. Signal Processing, Elsevier, 2012, 92 (1), pp.76-88. ⟨10.1016/j.sigpro.2011.06.008⟩. ⟨hal-00617911⟩

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