Pulse or digital communications – Receivers – Angle modulation
Patent
1997-08-20
1999-12-14
Chin, Stephen
Pulse or digital communications
Receivers
Angle modulation
375272, 375275, 375334, 329300, 329302, H03D 300, H04L 2714, H04L 2710
Patent
active
060027258
ABSTRACT:
An M-ary FSK receiver in which a frequency down-converted signal is treated as an M-ary DPSK signal with symbol repetition coding. The output of a frequency demodulator (20) is integrated (22) over an optimally chosen time interval which is a fraction of the symbol interval to obtain N phase change estimates per symbol. These N sub-symbols are manipulated (24, 26) to obtain corresponding soft decisions which are then summed (32, 34) over a symbol period (or a substantial fraction thereof) to provide an overall soft decision for each bit comprising an M-ary symbol. These outputs may be used directly as soft decisions for forward error correction or applied to a threshold circuit to obtain hard decisions.
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Bolourchi, Nader, "Optimum Processing of Multilevel CPFSK", IEEE, pp. 681-684, Feb. 1992.
Kwon et al., "Limiter-Differential Detection of a Frquency-Hopped CPFSK Diversity System in a Partial-Band Jamming", IEEE Journal on Selected Areas in Communications, vol. 10, No. 4, pp. 724-730, May 1992.
Korn, "M-ary Frequency Shift Keying with Limiter-Discriminator-Integrator Detector in Satellite Mobile Channel with Narrow-Band Receiver Filter", IEEE Transactions on Communications, vol. 38, No. 10, pp. 1771-1778, Oct. 1990.
Chin Stephen
Maddox Michael W.
Slobod Jack D.
U.S. Philips Corporation
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