Pulse or digital communications – Transmitters – Angle modulation
Reexamination Certificate
2007-07-24
2007-07-24
Deppe, Betsy L. (Department: 2611)
Pulse or digital communications
Transmitters
Angle modulation
C375S232000
Reexamination Certificate
active
10126258
ABSTRACT:
A reconfigurable communication transmitter core includes a digital pulse-shaping filter to perform pulse-shaping operations upon a digital modulated signal and a finite state machine to controls operation and reconfiguration of the digital pulse-shaping filter. A first memory stores coefficients and a second memory stores data. A multiplier multiplies a data value stored in the second memory with a corresponding coefficient value stored in the first memory. An adder adds each multiplication product from the multiplier with the content of an accumulation register wherein the accumulation register accumulates the sum from the adder. A rounding unit rounds off the content of the accumulation register and to provide rounded-off content as an output of the reconfigurable communication transmitter core. The finite state machine reconfigures a look-up table value set in the first memory, the first memory having pre-stored therein pulse shaped filtered waveforms. The pulse shaped filtered waveform having been pre-calculated.
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“π/4-DQPSK Data-Modulation Schemes Help Enable 3G Systems” by Dimitrios Efstathiou; Wireless Systems Design, Jan. 1999; pp. 27-32.
Analog Devices Inc.
Deppe Betsy L.
Gauthier & Connors LLP
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