Preamble detection and time-of-arrival estimation for a single-tone frequency hopping random access preamble
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorsXingqin Lin, Yi-Pin Eric Wang, Ansuman Adhikary
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Abstract
A receiver baseband processor and method for performing preamble detection and Time-of-Arrival, ToA, estimation for a single-tone frequency hopping random access preamble. The processor FFT processes a received signal and identifies logical tones. For each logical tone, the processor reads received symbols; determines a ToA estimate; forms a statistic based on the ToA estimate; compares the statistic to a preamble threshold; and when the statistic is greater than or equal to the threshold, determines a preamble is present and utilizes the ToA estimate for a timing advance command.
Claims24
A method in a baseband processor of a receiver for performing preamble detection and time-of-arrival, ToA, estimation for a single-tone frequency hopping random access preamble, said method comprising:
- Fast Fourier Transform, FFT, processing a received signal and identifying logical tones;
- and
- for each logical tone:
- reading received symbols;
- determining a ToA estimate and a residual Carrier Frequency Offset, CFO, estimate;
- forming a statistic based on the ToA estimate and the residual CFO estimate;
- comparing the statistic to a preamble threshold;
- and
- when the statistic is greater than or equal to the threshold, determining a preamble is present and utilizing, by the baseband processor of the receiver, the ToA estimate for a timing advance command.
A receiver for performing preamble detection and time-of-arrival, ToA, estimation for a single-tone frequency hopping random access preamble, said receiver comprising:
- a receiver front end for receiving a radio frequency, RF, signal;
- and
- a baseband processor for processing the received RF signal, wherein the baseband processor includes a processing circuit configured to:
- Fast Fourier Transform, FFT, process the received signal and identify logical tones;
- and
- for each logical tone:
- read received symbols;
- determine a ToA estimate and a residual Carrier Frequency Offset, CFO, estimate;
- form a statistic based on the ToA estimate and the residual CFO estimate;
- compare the statistic to a preamble threshold;
- and
- when the statistic is greater than or equal to the threshold, determine a preamble is present and utilize the ToA estimate for a timing advance command.
Dependencies are inferred from the claim text.