Pulse or digital communications – Repeaters – Testing
Patent
1996-07-26
1999-03-02
Pham, Chi H.
Pulse or digital communications
Repeaters
Testing
375208, H04B 1500, H04K 100
Patent
active
058780750
ABSTRACT:
An augmenting circuit (153) augments an embedded PN sequence of 2.sup.N -1 chips generated by an N-bit LSSR (111) to provide an augmented PN sequence of 2.sup.N chips and an augmented PN sequence of 2.sup.N chips shifted by D chips. The augmenting circuit comprises a N-bit counter (123) that counts a plurality of clock bits. The N-bit counter provides a pre-carry signal that changes state when the counter's index equals a predetermined value and provides a value of the N-k most-significant-bits (MSB) of the index. A logic circuit (107,119) receives the plurality of clock bits and responds to the pre-carry signal to gate the plurality of clock bits. A comparator (135) receives the value of the N-k MSB and a threshold value to output a select signal that controls a multiplexer (139).
REFERENCES:
patent: 4912721 (1990-03-01), Pidgeon, Jr. et al.
patent: 5228054 (1993-07-01), Rueth et al.
Cook, Charles E. and Marsh, Howard S., "An Introduction to Spread Spectrum", IEEE Communications Magazine, Mar. 1983, pp. 8-16.
Whipple, David P., "The CDMA Standard", Applied Microwave & Wireless, pp. 24-37.
Simon, Marvin K. et al., Chapter 5, "Pseudonoise Generators", Spread Spectrum Communications, vol. 1, Computer Science Press, 1985, pp. 262-305, & 358-397.
Frank Colin D.
Ling Fuyun
Bayard Emmanuel
Kordich Donald C.
Motorola Inc.
Pham Chi H.
Williams Lalita P.
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