Apparatus for generating orthogonal sequences
First Claim
1. An apparatus for generating an orthogonal sequence comprising M-sequence generating means for outputting a signal of M-sequence of which the component takes 0 or 1 and the period is N, and substitution means connected to an output of said M-sequence generating means for substituting the component of the M-sequence to provide an output signal as the orthogonal sequence signal, said substitution means substituting the component of the M-sequence with A0 ejφ
- .sbsp.0 when the value of the component is 0 and with A1 ejφ
.sbsp.1 when it is 1, where each of A0 and A1 is a positive real number, and the substitution being made in such a manner that the phase difference of φ
1 -φ
0 and the amplitude ratio of A1 /A0 satisfy the following condition;
##EQU28## where, f1 is a trigonometric function having the phase of φ
1 -φ
0 ;
f2 is a quadratic function of A1 /A0 with a coefficient of a linear function of N; and
f3 is a linear function of A1 /A0 with a coefficient of a linear function of N.
1 Assignment
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Accused Products
Abstract
An apparatus for generating orthogonal sequences is disclosed which includes an M-sequence generator for providing a signal of M-sequence of which the component takes 0 or 1 and the period is N, and substitution means connected to the output of the M-sequence generator for substituting the component of the M-sequence. The substitution means substitute the component with A0 ejφ.sbsp.0 when the value of the component is 0 and with A1 ejφ.sbsp.1 when it is 1, where each of A0 and A1 is a positive real number, and the substitution is performed so that a trigonometric function f1 (φ1 -φ0) having a phase of (φ1 -φ0) is a ratio of two functions f2 (A1 /A0) which is a quadratic function of A1 /A0 with a coefficient of a linear function of N and f3 (A1 /A0) which is a linear function of A1 /A0 with a coefficient of a linear function of N, whereby the orthogonal sequence is generated from the substitution means.
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Citations
15 Claims
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1. An apparatus for generating an orthogonal sequence comprising M-sequence generating means for outputting a signal of M-sequence of which the component takes 0 or 1 and the period is N, and substitution means connected to an output of said M-sequence generating means for substituting the component of the M-sequence to provide an output signal as the orthogonal sequence signal, said substitution means substituting the component of the M-sequence with A0 ejφ
- .sbsp.0 when the value of the component is 0 and with A1 ejφ
.sbsp.1 when it is 1, where each of A0 and A1 is a positive real number, and the substitution being made in such a manner that the phase difference of φ
1 -φ
0 and the amplitude ratio of A1 /A0 satisfy the following condition;
##EQU28## where, f1 is a trigonometric function having the phase of φ
1 -φ
0 ;
f2 is a quadratic function of A1 /A0 with a coefficient of a linear function of N; and
f3 is a linear function of A1 /A0 with a coefficient of a linear function of N. - View Dependent Claims (2, 3, 4, 5, 6)
- .sbsp.0 when the value of the component is 0 and with A1 ejφ
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7. A code-modulation apparatus of a transmission/reception system, said apparatus including:
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means for generating an orthogonal sequence comprising M-sequence generating means for outputting a signal of M-sequence of which the component takes 0 or 1 and the period is N, and substitution means connected to an output of said M-sequence generating means for substituting the component of the M-sequence to provide an output signal as the orthogonal sequence signal, said substitution means substituting the component of the M-sequence with A0 ejφ
.sbsp.0 when the value of the component is 0 and with A1 ejφ
.sbsp.1 when it is 1, where each of A0 and A1 is a positive real number, and the substitution being made in such a manner that the phase difference of φ
1 -φ
0 and the amplitude ratio of A1 /A0 satisfy the following condition;
##EQU30## where, f1 is a trigonometric function having the phase of φ
1 -φ
0 ;
f2 is a quadratic function of A1 /A0 with a coefficient of a linear function of N; and
f3 is a linear function of A1 /A0 with a coefficient of a linear function of N; andmodulation means for code-modulating a local oscillation signal with the signal from said orthogonal sequence generating apparatus. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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Specification