Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
229 words
(1) An antenna selection diversity receiver system for TDM receive signal comprising; a plurality of antennas, a selection switch for selecting one of said antennas, a receiver/demodulator coupled with the selected antenna through said selection switch for providing demodulated receive signal and receive level, a frame synchronization circuit coupled with output of said receiver/demodulator for effecting frame synchronization of TDM signal, an antenna selection circuit coupled with output of said receiver/demodulator for receiving said receive level, and copuled with said selection switch for controlling said selection switch, said antenna selection circuit comprising; a timing circuit coupled with said frame synchronization circuit for finding beginning of assigned time slot, first storage means for storing receive level of each antenna just before said assigned time slot, slope means for providing slope of said receive level of each antenna, second storage means for storing output of said slope means, prediction means for predicting receive signal quality of each antenna in assigned time slot according to said receive level and said slope by using output of said first storage means and said second storage means, and a switch control circuit coupled with said timing circuit and said prediction means for switching said selection switch just before beginning of said assigned time slot for every assigned slots so that an antenna providing the best predicted receive signal quality in assigned time slot is selected.
Claim 2
Dependent Claim
19 words
(2) An antenna selection diversity receiver system according to claim 1, wherein said slope means is a differentiation circuit.
Claim 3
Dependent Claim
31 words
(3) An antenna selection diversity receiver system according to claim 1, wherein said slope means comprises a subtractor for providing difference of two receive levels at different time for each antenna.
Claim 4
Dependent Claim
40 words
(4) An antenna selection diversity receiver system according to claim 1, wherein said first storage means and said second storage means are implemented by a digital register, and said slope means and said predictor means are implemented by a ROM.
Claim 5
Dependent Claim
31 words
(5) An antenna selection diversity receiver system according to claim 1, wherein said prediction means predicts average error rate of each antenna in assigned time slot as said receive signal quality.
Claim 6
Dependent Claim
34 words
(6) An antenna selection diversity receiver system according to claim 1, wherein said prediction means predicts receive level of each antenna at the center of the assigned time slot as said receive signal quality.
Claim 7
Dependent Claim
33 words
(7) An antenna selection diversity receiver system according to claim 1, wherein said prediction means predicts the minimum receive level of each antenna in the assigned time slot as said receive signal quality.
Claim 8
Dependent Claim
32 words
(8) An antenna selection diversity receiver system according to claim 1, wherein more than three receive levels for each antenna are measured for prediction of receive quality in an assigned time slot.