Pulse or digital communications – Receivers – Angle modulation
Patent
1995-06-26
1996-05-14
Chin, Stephen
Pulse or digital communications
Receivers
Angle modulation
375346, H04L 2722
Patent
active
055175309
ABSTRACT:
Selectable demodulation means within a given receiver to demodulate signals potentially subjected to many different types of degradations as typically encountered in mobile communications systems, and to select the best result of provide significant performance improvement is disclosed. In accordance with the method, when an RF signal is received it is sampled and the samples are demodulated. Demodulation is performed using both coherent and non-coherent schemes with the preferred scheme selected according to the quality of performance of each demodulator. Coherent demodulation can provide better performance when the signal is subjected to significant path loss but little fading. Non-coherent demodulation can provide better performance when the signal is subjected to less path loss but significant fading. Details of the method are disclosed.
REFERENCES:
patent: 4290140 (1981-09-01), Malm
patent: 5283531 (1994-02-01), Serizawa et al.
A Parallel Systems Approach to Universal Receivers, Madhow et al., IEEE Transactions on Information Theory, vol. 27, No. 2, Mar. 1991, pp. 291-306.
Parallel Structures for Universal Communication Receivers, Communication, Control, And Signal Processing, Proceedings of the 1990 Bilkent International Conference on New Trends in Communication, Control, and Signal Processing held at Bilkent Univ., Ankara, Turkey, vol. 1, 2-5 Jul. 1990, pp. 215-227.
Universal Receivers with Side Information From the Demodulators: An Example for Nonselective Rician Fading Channels, Madhow et al., IEEE Transactions on Communications, vol. 42, No. 7, Jul. 1994, pp. 2395-2405.
Chin Stephen
Pacific Communication Sciences, Inc.
Phan Hai H.
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