Pulse or digital communications – Repeaters – Testing
Patent
1984-12-17
1987-03-03
Ng, Jin F.
Pulse or digital communications
Repeaters
Testing
375 64, 375 90, H04L 2712
Patent
active
046480986
ABSTRACT:
A minimum shift keyed reference signal generator is described (FIG. 3) incorporating a shift register, for holding a spreading function, a first and second memory for holding in-phase and quadrature weights, a counter for addressing the first and second memory and first and second Exclusive OR circuits for combining the weights when addressed by the counter with the spreading function held in the shift register. A minimum shift keyed correlator is described (FIGS. 5A, 5B) incorporating a minimum shift keyed reference signal generator for generating in-phase and quadrature weights, an oscillator and first and second mixers for deriving the in-phase and quadrature component of a received minimum shift keyed signal, sample and hold means for sampling the in-phase and quadrature signal, a plurality of shift registers for holding the in-phase and quadrature signal, a plurality of shift registers for holding the in-phase and quadrature weights of the reference signal, a plurality of switches for coupling the received in-phase and quadrature signals to plus and minus buses according to the reference signal in respective bits of the shift registers, subtractor circuits for subtracting the plus bus from the minus bus and adders for adding the output of the subtractor circuits together and means for determining the magnitude of the in-phase and quadrature components whereby the product of the reference signal and the received signal including in-phase and quadrature components is determined. The invention overcomes the problem of a reference signal having a plurality of amplitudes requiring amplitude multiplying circuits for correlating minimum shift keyed data.
REFERENCES:
patent: 4500856 (1985-02-01), Childs
patent: 4539533 (1985-09-01), French
Digital Communications by Satellite, Bhargava et al., Wiley & Sons, 1981, chapter 9, section 9.1.
Part No. R5401 Reticon Corporation, Wellesley, Mass.
E. J. Kelly, "Sampled-Data Receiver Design & Performance for BPSK & MSK Spreading Modulations", Technical Report 550, Lincoln Laboratory, Massachusetts Institute of Technology, Jan. 19, 1981, pp. 54.
Allied Corporation
Glenny Raymond C.
Lamb Bruce L.
Ng Jin F.
Trepp Robert M.
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