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Patent
H - Electricity
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H04L 27/00 (2006.01) H03K 7/08 (2006.01) H03K 7/10 (2006.01) H03K 9/08 (2006.01) H03K 9/10 (2006.01) H03M 7/20 (2006.01) H03M 13/51 (2006.01) H04B 14/00 (2006.01) H04L 27/26 (2006.01) H04L 27/34 (2006.01) H04L 27/36 (2006.01) H04L 27/38 (2006.01)
Patent
CA 2261826
A digital modulation system provides enhanced multipath performance by using modified orthogonal codes with reduced autocorrelation sidelobes while maintaining the cross-correlation properties of the modified codes. For example, the modified orthogonal codes can reduce the autocorrelation level so as not to exceed one-half the length of the modified orthogonal code. In certain embodiments, an M-ary orthogonal keying (MOK) system is used which modifies orthogonal Walsh codes using a complementary code to improve the auto-correlation properties of the Walsh codes, thereby enhancing the multipath performance of the MOK system while maintaining the orthogonality and low cross-correlation characteristics of the Walsh codes.
Van Nee Richard D. J.
Kirby Eades Gale Baker
Lucent Technologies Inc.
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