Synchronous adder device

Details Synchronous adder device Synchronous adder device

1994-09-30

1997-04-29

Chin, Stephen

Pulse or digital communications

Receivers

Angle modulation

375343, 375349, 375350, 375355, H04L 2714

Patent

active

056256507

ABSTRACT:
A synchronous adder device comprising an A/D converter for digitizing a receive signal transmitted through a plurality of subcarriers by sampling it and an adding unit for determining the value of synchronous addition for each sample is provided with synthetic waveform shaping filters for waveform-shaping every other subcarrier, squaring units for squaring the respective outputs of the synthetic waveform shaping filters, and a low pass filter for removing a harmonic components from the sum of outputs of the squaring units. In the case where the signal is transmitted through four subcarriers, synchronous addition becomes possible by using the synthetic waveform shaping filters the number of which is two for each of an I signal and a Q signal or is four in total. The number of squaring units equal to the number of synthetic waveform shaping filters suffices. Though an output of the squaring unit includes an envelope component and harmonic components since the squaring unit squares signals of the plurality of subcarriers together, the harmonic components can be removed by the low pass filter, thereby making it possible to extract only the envelope component.

REFERENCES:
patent: 4601045 (1986-07-01), Lubarsky
patent: 4737728 (1988-04-01), Nakamura et al.
patent: 5323391 (1994-06-01), Harrison

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