Pulse or digital communications – Repeaters – Testing
Patent
1994-08-30
1997-01-21
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375200, 375343, 375239, 332112, 370213, H04K 100, H03K 704
Patent
active
055966012
ABSTRACT:
A spread spectrum code pulse position modulated communication system is disclosed. The frequency spectrum of a transmitted signal is spread by encoding bits with a predefined spectrum-spreading codeword which is in accordance with regulatory requirements or other standardization decisions. When the predefined spread spectrum codeword is passed through a filter matched to the characteristics of the codeword, a peak is detected in the main lobe. A positive main lobe can indicate a binary value of "0" and a negative main lobe, associated with the inverse of the predefined codeword, can represent a binary value of "1". Additional information is conveyed by modulating the position of the center of the codeword within the symbol duration. In one embodiment, the position of the center of the codeword is varied among eight positions. Thus, eight signal states are available, and three additional bits may thereby be conveyed. Two differently and independently time-shifted spread spectrum codewords may be modulated, each with one of two orthogonal carrier signals, such as a sine and a cosine wave, thereby conveying a total of eight bits per symbol duration. Here, a symbol duration is the duration of a codeword.
REFERENCES:
patent: 5157686 (1992-10-01), Omura et al.
patent: 5166952 (1992-11-01), Omura et al.
Okazaki, I., and Hasegawa, T., "Spread Spectrum Pulse Position Modulation--A Simple Approach for Shannon's Limit--," Singapore ICCS/ISITA '92, Nov. 16-20, 1992, Singapore, pp. 300-304.
Okazaki, I., and Hasegawa, T., "Spread Spectrum Pulse Position Modulation and Its Asynchronous CDMA Performance--A Simple Approach For Shannon's Limit--," IEEE Second International Symposium on Spread Spectrum Techniques and Applications, Nov. 29-Dec. 2, 1992, Yokohama, Japan, pp. 325-328.
U.S. patent application Ser. No. 08/146,490, dated Nov. 1, 1993, (not enclosed).
Zhang, N., and Golomb, S. W., "Sixty Phase Generalized Barker Sequences," IEEE Trans. on Information Theory, vol. 35, No. 4, (Jul. 1989), pp. 911-912.
Chin Stephen
Ghebretinsae T.
Lucent Technologies - Inc.
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