Chunk-based double-dwell preamble detection

摘要

In one embodiment, the invention is a method for performing preamble detection in a wireless communication network. The method performs a first dwell, wherein non-overlapping chunks of received data are processed to generate partial correlation values for each possible combination of a signature code and delay. Candidate selection is performed by comparing each of the partial correlation values to a candidate-selection threshold. For each detected candidate, the chunks of received data are processed to generate full correlation values. Each full correlation value is then compared to a preamble-detection threshold to detect a transmitted signature. Generating full correlation values for only the selected candidates reduces the computation complexity over prior-art methods that generate full correlation values for all signatures at all delays.

主权项

1. A receiver-implemented method for detecting a preamble in a data signal transmitted from a transmitter and received at the receiver after a propagation delay, the method comprising:
(a) generating a plurality of partial-profile values based on a first set of one or more chunks of the data signal, wherein:
each chunk comprises multiple chips of the data signal;each partial-profile value corresponds to a different combination of (i) a possible preamble of a set of different possible preambles and (ii) a possible propagation delay of a set of different possible propagation delays; andthe plurality of partial-profile values corresponds to a set of the different combinations; (b) selecting a subset of the set of the different combinations as two or more candidates based on the partial-profile values, wherein:
each candidate corresponds to a different combination of a possible preamble and a possible propagation delay; andtwo or more of the plurality of partial-profile values are generated in step (a) before selecting any of the two or more candidates in step (b); (c) generating two or more full-profile values based on a second set of chunks of the data signal, wherein each full-profile value corresponds to a different selected candidate; and (d) detecting the preamble based on the two or more full-profile values.