Back to results
US 8,553,810 B2Granted
Frequency offset and channel gain tracking for enhanced transmission efficiency
AssigneeKoninklijke Philips N.V.
InventorKun-Wah Yip
Life of this patent
Estimating the term…
Abstract
The present invention relates to an apparatus, method and computer program product for enhanced data reception, wherein a tracking procedure is enhanced to support long payloads by introducing additional channel-gain tracking applied together with frequency-offset tracking to the payload data. Thereby, both residual frequency offset and residual channel gain are reduced.
Claims9
An apparatus comprising:
- an estimator for performing frequency-offset and channel estimation based on a preamble portion of a received data packet;
- a partitioner for partitioning a payload portion of said received data packet into segments;
- and
- a tracking processor for applying frequency-offset tracking and channel-gain tracking based on said segments of said payload portion, the tracking processor being configured to:
- apply an initial frequency offset compensation and channel equalization to symbols in a current segment by using estimates of a residual frequency offset and a residual channel gain established on the basis of symbols in a previous segment, so as to obtain channel-equalized symbols;
- demodulate the channel equalized symbols, so as to obtain demodulated symbols;
- remove modulation in the channel-equalized symbols by using the demodulated symbols, so as to obtain modulation-removed symbols;
- estimate a residual frequency offset for the current segment based on a predetermined number of the modulation-removed symbols;
- frequency-offset compensate the modulation-removed symbols on the basis of the residual frequency offset that has been estimated for the current segment, so as to obtain frequency-offset-compensated modulation-removed symbols;
- estimate a residual channel gain for the current segment on the basis of the frequency-offset-compensated modulation-removed symbols;
- and
- store the residual frequency offset and the residual channel gain, which have been estimated for the current segment, to apply an initial frequency offset compensation and channel equalization to symbols in a subsequent segment by using the residual frequency offset and the residual channel gain, which have been estimated for the current segment.
9 more elements
A method comprising:
- performing frequency-offset and channel estimation based on a preamble portion of a received data packet;
- partitioning a payload portion of said received data packet into segments;
- and
- applying frequency-offset tracking and channel-gain tracking based on said segments of said payload portion, including:
- applying an initial frequency offset compensation and channel equalization to symbols in a current segment by using estimates of a residual frequency offset and a residual channel gain established on the basis of symbols in a previous segment, resulting in channel-equalized symbols;
- demodulating the channel equalized symbols, resulting in demodulated symbols;
- removing modulation in the channel-equalized symbols by using the demodulated symbols, resulting in modulation-removed symbols;
- estimating a residual frequency offset for the current segment based on a predetermined number of the modulation-removed symbols;
- frequency-offset compensating the modulation-removed symbols on the basis of the residual frequency offset that has been estimated for the current segment, resulting in frequency-offset-compensated modulation-removed symbols;
- estimating a residual channel gain for the current segment on the basis of the frequency-offset-compensated modulation-removed symbols;
- and
- storing the residual frequency offset and the residual channel gain, which have been estimated for the current segment, to apply an initial frequency offset compensation and channel equalization to symbols in a subsequent segment by using the residual frequency offset and the residual channel gain, which have been estimated for the current segment.
9 more elements
A receiver device of a body area network, said receiver device comprising:
- an apparatus that includes
- an estimator for performing frequency-offset and channel estimation based on a preamble portion of a received data packet;
- a partitioner for partitioning a payload portion of said received data packet into segments;
- and
- a tracking processor for applying frequency-offset tracking and channel-gain tracking based on said segments of said payload portion, the tracking processor being configured to:
- apply an initial frequency offset compensation and channel equalization to symbols in a current segment by using estimates of a residual frequency offset and a residual channel gain established on the basis of symbols in a previous segment, so as to obtain channel-equalized symbols;
- demodulate the channel equalized symbols, so as to obtain demodulated symbols;
- remove modulation in the channel-equalized symbols by using the demodulated symbols, so as to obtain modulation-removed symbols;
- estimate a residual frequency offset for the current segment based on a predetermined number of the modulation-removed symbols;
- frequency-offset compensate the modulation-removed symbols on the basis of the residual frequency offset that has been estimated for the current segment, so as to obtain frequency-offset-compensated modulation-removed symbols;
- estimate a residual channel gain for the current segment on the basis of the frequency-offset-compensated modulation-removed symbols;
- and
- store the residual frequency offset and the residual channel gain, which have been estimated for the current segment, to apply an initial frequency offset compensation and channel equalization to symbols in a subsequent segment by using the residual frequency offset and the residual channel gain, which have been estimated for the current segment.
10 more elements
Dependencies are inferred from the claim text.