Preamble detection with multiple receive antennas
First Claim
1. A system comprising:
- a differential demodulation module configured to generate differentially demodulated signals based on having differentially demodulated received signals, anda first summing module configured to generate a combined signal by adding the differentially demodulated signals, wherein the combined signal includes a plurality of symbols; and
a second summing module configured togenerate a plurality of sums for each of a plurality of derived preamble sequences, wherein the derived preamble sequences are derived from preamble sequences, wherein each of the derived preamble sequences includes a plurality of derived symbols, and wherein one of the plurality of sums generated for one of the derived preamble sequences is a sum of (i) a first portion of one of the plurality of symbols of the combined signal and (ii) a second portion of one of the derived symbols of the one of the derived preamble sequences, andgenerate cross-correlation values for the derived preamble sequences based on the plurality of sums, wherein one of the cross-correlation values generated for one of the derived preamble sequences is a sum of the plurality of sums generated for the one of the derived preamble sequences.
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Abstract
A system including a differential demodulation module, a first summing module, and a second summing module. The differential demodulation module generates differentially demodulated signals based on having differentially demodulated received signals. The first summing module generates a combined signal by adding the differentially demodulated signals, wherein the combined signal includes a plurality of symbols. The second summing module generates a plurality of sums for each of a plurality of derived preamble sequences, wherein the derived preamble sequences are derived from preamble sequences, and wherein each of the derived preamble sequences includes a plurality of derived symbols. The second summing module further generates cross-correlation values for the derived preamble sequences based on the plurality of sums, wherein one of the cross-correlation values generated for one of the derived preamble sequences is a sum of the plurality of sums generated for the one of the derived preamble sequences.
36 Citations
16 Claims
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1. A system comprising:
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a differential demodulation module configured to generate differentially demodulated signals based on having differentially demodulated received signals, and a first summing module configured to generate a combined signal by adding the differentially demodulated signals, wherein the combined signal includes a plurality of symbols; and a second summing module configured to generate a plurality of sums for each of a plurality of derived preamble sequences, wherein the derived preamble sequences are derived from preamble sequences, wherein each of the derived preamble sequences includes a plurality of derived symbols, and wherein one of the plurality of sums generated for one of the derived preamble sequences is a sum of (i) a first portion of one of the plurality of symbols of the combined signal and (ii) a second portion of one of the derived symbols of the one of the derived preamble sequences, and generate cross-correlation values for the derived preamble sequences based on the plurality of sums, wherein one of the cross-correlation values generated for one of the derived preamble sequences is a sum of the plurality of sums generated for the one of the derived preamble sequences. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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generating differentially demodulated signals by differentially demodulating received signals; generating a combined signal by adding the differentially demodulated signals, wherein the combined signal includes a plurality of symbols; generating a plurality of sums for each of a plurality of derived preamble sequences, wherein the derived preamble sequences are derived from preamble sequences, wherein each of the derived preamble sequences includes a plurality of derived symbols, and wherein one of the plurality of sums generated for one of the derived preamble sequences is a sum of (i) a first portion of one of the plurality of symbols of the combined signal and (ii) a second portion of one of the derived symbols of the one of the derived preamble sequences; and generating cross-correlation values for the derived preamble sequences based on the plurality of sums, wherein one of the cross-correlation values generated for one of the derived preamble sequences is a sum of the plurality of sums generated for the one of the derived preamble sequences. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification