Maximum likelihood synchronization for a communications system using a pilot symbol
AssigneeIndustrial Research Limited
InventorAlan James Coulson
Life of this patent
Estimating the term…
Abstract
A method and apparatus for detecting and synchronizing packets of data with a repeated sequence as a pilot symbol received by a communications system are provided. The method and apparatus include receiving data, detecting a packet within the received data, producing an estimate of the time-varying frequency offset of the received data, estimating the start of the packet of the received data, estimating the time-varying phase offset of the received data and estimating the time-varying time offset of the received data. Methods for assessing each one of the time-varying frequency offset, the time-varying phase offset, the time-varying time offset and the start of packet are also provided.
Claims65
A method of detecting and synchronising packets of data with a repeated sequence as a pilot symbol received by a communications system comprising the steps of receiving data at a receiver as a series of data samples, and performing the following steps in the receiver:
- detecting a packet within the received data, producing an estimate of the time-varying frequency offset of the received data, estimating the start of the packet of the received data, estimating the time-varying frequency offset of the received data again after the packet start has been estimated, estimating the time-varying phase offset of the received data and estimating the time-varying time offset of the received data.
A receiver for detecting and synchronising packets of data with a repeated sequence as a pilot symbol received by a communications system including:
- a front end arranged to receive data, a packet detect estimator arranged to detect a packet within the received data, a frequency offset estimator arranged to produce an estimate of the time-varying frequency offset of the received data, a start of packet estimator arranged to estimate the start of the packet of the received data, a phase offset estimator arranged to estimate the time-varying phase offset of the received data and a time offset estimator arranged to estimate the time-varying time offset of the received data, and wherein the frequency offset estimator is further arranged to estimate the time-varying frequency offset of the received data again after the packet start has been estimated.
Dependencies are inferred from the claim text.