Superposed quadrature modulated baseband signal processor
First Claim
Patent Images
1. A signal processor comprising:
- (a) means for converting an NRZ input signal to a double interval raised cosine pulse having a peak amplitude normalized to 1.0,(b) means for superposing another weighted single interval raised cosine pulse having a peak amplitude (A-1) with the former raised cosine pulse to provide a continuous output signal, of a form related to the NRZ input signal,in which the converting and superposing means are comprised of;
(i) means for detecting the binary values of each pair of consecutive bits of the NRZ input signal;
(ii) means for generating an output signal having the function Y1 =-A(1-A) cos (2π
t/T) if the pair of bits are -1, -1;
(iii) means for generating an output signal having the function Y2 =-cos (π
t/T) if the pair of bits are 1, -1;
(iv) means for generating an output signal having the function Y3 =cos (π
t/T) if the pair of bits are -1, 1 and(v) means for generating an output signal having the function Y4 =A+(1-A) cos (2π
t/T) if the pair of bits are 1,1,where T is the NRZ input signal symbol duration, and A is the amplitude parameter of the processor,the output signals being continuous.
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Abstract
A signal processor for providing a continuous raised cosine output signal having no jitter or intersymbol-interference and with controllable main and side lobes. An NRZ input signal is converted to a double interval raised cosine pulse signal having an amplitude normalized to 1.0. Another single interval raised cosine pulse signal having a peak amplitude (A-1) is superposed with the former raised cosine pulse to provide the output signal.
196 Citations
20 Claims
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1. A signal processor comprising:
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(a) means for converting an NRZ input signal to a double interval raised cosine pulse having a peak amplitude normalized to 1.0, (b) means for superposing another weighted single interval raised cosine pulse having a peak amplitude (A-1) with the former raised cosine pulse to provide a continuous output signal, of a form related to the NRZ input signal, in which the converting and superposing means are comprised of; (i) means for detecting the binary values of each pair of consecutive bits of the NRZ input signal; (ii) means for generating an output signal having the function Y1 =-A(1-A) cos (2π
t/T) if the pair of bits are -1, -1;(iii) means for generating an output signal having the function Y2 =-cos (π
t/T) if the pair of bits are 1, -1;(iv) means for generating an output signal having the function Y3 =cos (π
t/T) if the pair of bits are -1, 1 and(v) means for generating an output signal having the function Y4 =A+(1-A) cos (2π
t/T) if the pair of bits are 1,1,where T is the NRZ input signal symbol duration, and A is the amplitude parameter of the processor, the output signals being continuous. - View Dependent Claims (2, 3, 4)
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5. A signal process for a modulator comprising:
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(a) means for detecting the binary values of each pair of consecutive bits of an NRZ input signal, (b) means for generating signals having waveshapes according to the functions y1 =-A-(1-A) cos (2π
t/T), y2 =-cos (π
t/T), y3 =cos (π
t/T) and y4 =A+(1-A) cos (2t/T), where T is the input signal symbol duration, and A is an amplitude parameter,(c) means for switching said y1, y2, y3 and y4 signals to an output transmission path to form a continuous signal according to the following table;
space="preserve" listing-type="tabular">______________________________________ 1st NRZ bit Following NRZ bit Output Signal ______________________________________ -1 -1 y.sub.1 1 -1 y.sub.2 -1 1 y.sub.3 1 1 y.sub.4 ______________________________________ - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A signal processor comprising:
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(a) means for detecting the binary values of each pair of consecutive bits of a digital signal, (b) means for generating a continuous output signal having a waveshape dependent on the binary values of each pair of said bits, in which said continuous output signal is formed of waveshapes according to the functions Y1 =-A-(1-A) cos (2π
t/T), Y2 =-cos (π
t/T), Y3 =cos (π
t/T) and Y4 =A+(1-A) cos (2π
t/T) where T is the input signal symbol duration, and A is an amplitude parameter, which follow in smooth sequence according to the following table;
space="preserve" listing-type="tabular">______________________________________ 1st NRZ bit Following NRZ bit Output Signal ______________________________________ -1 -1 Y.sub.1 1 -1 Y.sub.2 -1 1 Y.sub.3 1 1 Y.sub.4 ______________________________________ - View Dependent Claims (18, 19, 20)
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Specification