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US 12,021,677 B2Granted
Method and apparatus for advanced OFDM triggering techniques
AssigneeSirius XM Radio Inc.
InventorsEdward Schell, Carl Scarpa
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Abstract
Systems and methods for a non-data-aided (NDA) approach to advanced OFDM timing are provided. This approach allows for accurate OFDM symbol timing and synchronization by avoiding inter-symbol interference (ISI) in multipath environments where an earliest arriving signal may not be the strongest signal. The NDA approach may rely on generating and applying a bias correction to a combined correlation result of the multi-path signals.
Claims8
A system comprising:
- an orthogonal frequency division multiplexing (OFDM) receiver module comprising an antenna;
- and
- at least one computing device, wherein the at least one computing device comprises:
- at least one processor;
- memory storing computer-readable instructions that, when executed by the at least one processor, cause the computing device to:
- receive, from the OFDM receiver module, a plurality of multi-path signals that correspond to a same signal delayed by different amounts during transmission over a plurality of wireless data paths;
- combine the plurality of multi-path signals into a combined signal;
- generate a combined correlation result for the combined signal based on a predefined guard interval;
- select a range of data samples associated with the combined correlation result based on a duration of the guard interval;
- apply a bias correction over the range of data samples;
- generate a biased correlation result responsive to the applied bias correction;
- and
- use, by the at least one data processor, a peak of the biased correlation result as a timing reference for a current OFDM symbol.
10 more elements
Dependencies are inferred from the claim text.