Patent
Phase-locked loop initialization via curve-fitting
Chris Heegard,Peter A. Murphy +1 more
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TLDR
In this paper, a method and apparatus for accurately estimating the carrier frequency offset and the carrier phase offset of a digitally modulated signal using a signal processing algorithm to initialize the state variables of a phase-locked loop (PLL) is disclosed.Abstract:
A method and apparatus for accurately estimating the carrier frequency offset and the carrier phase offset of a digitally modulated signal using a signal processing algorithm to initialize the state variables of a Phase-Locked Loop (PLL) is disclosed. A sequence of phase values is estimated from a received sequence of symbols and the angular effect due to the modulation format is removed from the sequence of phase values. A curve-fit algorithm based in one embodiment on the RLS algorithm is then applied to a sequence of unwrapped phase values to estimate the carrier frequency offset and the carrier phase offset.read more
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Patent
Complexity reduced feed forward carrier recovery methods for m-qam modulation formats
Xiang Zhou,Yifan Sun +1 more
TL;DR: In this article, a method of carrier phase error removal associated with an optical communication signal using coarse phase recovery was proposed. But the method was not suitable for the case of the first phase of an information signal.
Patent
Receiver of an orthogonal frequency division multiplexing system
TL;DR: In this article, a received signal transformer removes from a training symbol a guardtone and a sub-carrier deviated from a mean value of effective subcarrier signals by over a predetermined value.
Patent
Frequency drift and phase error compensation in a VOFDM receiver
TL;DR: Improved frequency drift and phase error compensation in a VOFDM receiver is presented in this article, where the compensation is performed after having performed estimation of the phase within a particular window, and any phase error and frequency drift may be identified and an appropriate form of compensation may then be identified to perform curve fitting of phase within the compensation window.
Patent
Carrier frequency detection for signal acquisition
TL;DR: In this article, a carrier frequency in a filtered received M-ary phase-shift keyed (MPSK) modulated signal having in-phase and quadrature components is detected by processing the filtered received signal to remove modulation components and thereby generate a test signal at the carrier frequency.
Patent
Reception apparatus, phase error estimation method, and phase error correction method
TL;DR: In this article, a signal extractor extracts received reference signals from received signals, and an error vector calculator calculates the error vectors of phase errors by comparing the extracted received reference signal with a known reference signal that is to be transmitted.
References
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Statistical signal processing : detection, estimation, and time series analysis
TL;DR: In this article, the authors introduce Rudiments of Linear Algebra and Multivariate Normal Theory, and introduce Neyman-Pearson Detectors and Maximum Likelihood Estimators.
Patent
Burst demodulator for establishing carrier and clock timing from a sequence of alternating symbols
Shousei Yoshida,Hizuru Nawata +1 more
TL;DR: In this paper, a burst demodulator is proposed to estimate the symbol timing of the burst signal from digital samples of the preamble, which can be used for clock timing and carrier phase recovery operations.
Patent
Communication system receiver apparatus and method for fast carrier acquisition
TL;DR: In this paper, a communications system receiver (100) is disclosed which receives a transmitted signal over a radio channel, including a demodulator and a stored replica (207) of the predetermined synchronization sequence.
Patent
Concatenated trellis coded modulation and linear block codes
C. Heegard,David J. Rowe +1 more
TL;DR: In this article, a concatenated trellis coded modulation and linear block (e.g., Reed-Solomon) encoding scheme was proposed, which splits data to be encoded into two data streams, one of which is both linear block encoded, and the other of which remains uncoded or is encoded with a weaker strength linear block code.
Patent
Carrier phase recovery system for adaptive burst modems and link hopping radio networks
TL;DR: In this article, a method for a carrier phase recovery in a multiple-link hopping radio system is proposed, which includes hopping among a plurality of radio links to receive bursts of radio signals on the plurality of wireless links and determining channel information for each radio link from a received burst on the radio link.