Patent ID: 6636556
Filing Date: 2003-10-21
Classification: H04B,H04J

Abstract:
A method for generation a set of Large-Area Code-Division-Multiple-Access (LA-CDMA) codes, comprising the steps of:generating a plurality of pulses with a plurality of intervals between each of the pulses in the plurality of pulses, respectively, each pulse of the plurality of pulses having an amplitude and a polarity, with each interval of the plurality of intervals unequal to other intervals of the plurality of intervals, with only one interval of the plurality of intervals being an odd number larger than a value of a smallest interval of the plurality of intervals, without a value of any interval in the plurality of intervals being a sum of any two or more values of two or more intervals, respectively, in the plurality of intervals; and generating a plurality of codewords from the plurality of pulses, with each codeword in the plurality of codewords different from other codewords in the plurality of codewords, by assigning, for each respective codeword in the plurality of codewords, a polarity to each pulse in the plurality of pulses, wherein the plurality of codewords are any of orthogonal, bi-orthogonal and trans-orthogonal, and a cross-correlation between any two codewords in the plurality of codewords has side lobes with any of the values of zero, plus amplitude squared, and minus amplitude squared, and any codeword in the plurality of codewords has a zero correlation window in an auto-correlation function and the cross-correlation function with a magnitude equal to the amplitude squared and with a width equal to two times the smallest interval of the plurality of intervals.