| 摘要 |
A transmitter and a receiver using a set of Large-Area Code-Division-Multiple-Access (LA-CDMA) codes. The LA-CDMA codes are generated from the steps of generating a plurality of pluses, and generating a plurality of codewords. The plurality of pluses has a plurality of intervals between each of the pulses in the plurality of pulses, respectively. Each pulse of the plurality of pulses has an amplitude and a polarity. Each interval of the plurality of intervals is unequal to other intervals of the plurality of intervals. Only one interval of the plurality of intervals is an odd number larger than a value of a smallest interval of the plurality of intervals. No value of any interval in the plurality of intervals is a sum of any two or more values of two or more intervals, respectively, in the plurality of intervals. Each codeword in the plurality of codewords is 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. The plurality of codewords are either orthogonal, or bi-orthogonal, or trans-orthogonal. The codewords are generated such that 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. 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.
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