Preamble detection with multiple receive antennas
First Claim
1. A system, comprising:
- a differential demodulation module that (i) receives modulated signals from R antennas and (ii) differentially demodulates the modulated signals to generate differentially demodulated signals, where R is an integer greater than or equal to 1;
a summing module that sums the differentially demodulated signals to generate a combined signal; and
a correlation module that (i) correlates the combined signal with derived preamble sequences and (ii) generates correlation values based on the correlation,wherein the derived preamble sequences are derived from preamble sequences, andwherein (i) each bit of one of the derived preamble sequences has a first state when a corresponding bit and a bit adjacent to the corresponding bit in a corresponding one of the preamble sequences have opposite states, and (ii) the each bit has a second state when the corresponding bit and the bit adjacent to the corresponding bit have the same state.
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Accused Products
Abstract
A system including a differential demodulation module that receives modulated signals from R antennas and that differentially demodulates the modulated signals to generate differentially demodulated signals, where R is an integer greater than or equal to 1. A summing module sums the differentially demodulated signals to generate a combined signal. A correlation module correlates the combined signal with derived preamble sequences and generates correlation values based on the correlation. The derived preamble sequences are derived from preamble sequences. Each bit of one of the derived preamble sequences has a first state when a corresponding bit and a bit adjacent to the corresponding bit in a corresponding one of the preamble sequences have opposite states. Each bit has a second state when the corresponding bit and the bit adjacent to the corresponding bit have the same state.
38 Citations
48 Claims
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1. A system, comprising:
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a differential demodulation module that (i) receives modulated signals from R antennas and (ii) differentially demodulates the modulated signals to generate differentially demodulated signals, where R is an integer greater than or equal to 1; a summing module that sums the differentially demodulated signals to generate a combined signal; and a correlation module that (i) correlates the combined signal with derived preamble sequences and (ii) generates correlation values based on the correlation, wherein the derived preamble sequences are derived from preamble sequences, and wherein (i) each bit of one of the derived preamble sequences has a first state when a corresponding bit and a bit adjacent to the corresponding bit in a corresponding one of the preamble sequences have opposite states, and (ii) the each bit has a second state when the corresponding bit and the bit adjacent to the corresponding bit have the same state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method, comprising:
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receiving modulated signals from R antennas, where R is an integer greater than or equal to 1; differentially demodulating the modulated signals; generating differentially demodulated signals; summing the differentially demodulated signals; generating a combined signal; correlating the combined signal with derived preamble sequences; and generating correlation values based on the correlation, wherein the derived preamble sequences are derived from preamble sequences, and wherein (i) each bit of one of the derived preamble sequences has a first state when a corresponding bit and a bit adjacent to the corresponding bit in a corresponding one of the preamble sequences have opposite states, and (ii) the each bit has a second state when the corresponding bit and the bit adjacent to the corresponding bit have the same state. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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Specification