Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2005-03-15
2005-03-15
Le, Amanda T. (Department: 2634)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S143000, C708S314000
Reexamination Certificate
active
06868109
ABSTRACT:
A receiving system or a received radio-wave estimation method is provided that can maintain received field strengths at a nearly uniform level under multipath conditions. The antenna switch can select outputs of four antennas at high speed. The high-frequency amplifier amplifies the output of the antenna switch and the demodulator demodulates amplified signals. The matched filter bank, surrounded with chain lines, receives a demodulated signal, for example, the I-phase component. In the matched filter bank, the phase shifter shifts respective signals output from four delay elements. The adder synthesizes the phase-shifted signals and then supplies the maximum matched output to the maximum level selector.
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Ishii Satoru
Kohno Ryuji
Futaba Corporation
Le Amanda T.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Williams Lawrence B.
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