Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1993-12-23
1995-12-26
Chin, Stephen
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
375349, H03D 100, H04L 2706
Patent
active
054794501
ABSTRACT:
In a digital data demodulating apparatus, a sampling circuit samples a received signal at a speed N.times.K (N>1, K>1; integers) times a symbol rate to output received signal sequences. N received signal sequence selection circuits estimate channel impulse responses from the respective received signal sequences to obtain channel state data, and output a control pulse and the estimated channel impulse response values. A received signal sequence selection controller outputs a switch control signal on the basis of the channel state data. N selectors select demodulation received signal sequence candidates from the received signal sequences on the basis of the control pulse. A first switch selects/outputs a received signal sequence to be demodulated on the basis of the switch control signal. A second switch selects/outputs an estimated channel impulse response value estimated from the received signal sequence to be demodulated on the basis of the switch control pulse. A demodulation circuit performs demodulation upon reception of the outputs from the first and second switches.
REFERENCES:
patent: 5127025 (1992-06-01), Okanoue
patent: 5263033 (1993-11-01), Seshadri
patent: 5272727 (1993-12-01), Okanoue
IEEE Transactions on Informatioin Theory, vol. 37, No. 6, Nov. 1991, pp. 1649-1657, C. N. Georghiades/M. Moeneclaey, "Sequence Estimation and Synchronization from Nonsynchronized Samples".
Giovanna D'aria, Roberto Piermanrini, and Valerio Zingarelli, "Fast Adaptive Equalizer for Narrow-Band TDMA Mobile Radio", IEEE, Transaction on Vehicular Technology, vol. 40, No. 2, May, 1991).
J. G. Proakis, "Digital Communications", McGraw-Hill, 1983, pp. 394-412.
Okanoue Kazuhiro
Ushirokawa Akihisa
Chin Stephen
NEC Corporation
Phan Hai H.
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