Methods and systems for detecting a preamble of a data packet in wireless communication systems

摘要

Methods and systems for detecting a preamble of a data packet in wireless communication systems is provided. To determine a preamble from a received signal, which may include a noise-altered preamble bit sequence, linear feedback shift registers (LFSRs) can be used to generate a count of the received preamble, and the count is compared to pre-generated scores to identify a match. Example methods include for each of a number of different preamble orientations of a preamble, generating a count value based on a comparison of bits of the preamble with a random bit sequence to produce a sequence of count values, and comparing the sequence of count values with m sequences of count values. A sequence of count values is identified that includes a maximum number of matching elements, and the received preamble is determined to be one of the m preambles corresponding to the identified sequence.

主权项

1. A receiver comprising:
a preamble processor including a register, a first comparator, and a counter, the preamble processor configured to receive a preamble and, for each of a number of different preamble orientations n of the preamble, generate a (1×n) matrix of count values output by the counter based on a comparison by the first comparator of each bit of the preamble with a random bit sequence output by the register; a look-up table; and a second comparator configured to identify a row of an (m×n) matrix, constructed of a plurality number of preambles m and preamble orientations n thereof, retrieved from the look-up table that best matches the (1×n) matrix, and provide the identified row to the preamble processor; wherein m and n are integer values greater than zero; and wherein the preamble processor is further configured to identify one of the number of preambles m corresponding to the identified row as the received preamble.