Waveform shaping method and equipment

A waveform generating equipment for generating and outputting in-phase signal waveforms which are baseband signals of in-phase components and quadrature signal waveforms which are baseband signals of quadrature components, in quadrature modulated signals, the waveform generating equipment comprising:

• a first waveform generating means for generating (1) a first waveform having symbols or (2) an inverted first waveform which comprises the symbols of the first waveform inverted, as a first output waveform,
• a second waveform generating means for generating (1) a second waveform having symbols or (2) an inverted second waveform which comprises the symbols of the second waveform inverted, as a second output waveform,
• a waveform selecting means for providing either the first output waveform or the second output waveform as a partial in-phase signal waveform and the other one of the first output waveform or the second output waveform as a partial quadrature signal waveform, said waveform selecting means further producing at least a complex signal waveform comprising the partial in-phase signal waveform in one symbol time as a real part and the partial quadrature signal waveform as an imaginary part where the complex signal waveform is designated as a sectional waveform having a first sectional waveform, a second sectional waveform that is obtained by rotating a phase of the first sectional waveform 90.degree., a third sectional waveform that is obtained by rotating the phase of the first sectional waveform 180.degree., and a fourth sectional waveform that is obtained by rotating the phase of the first sectional waveform 270.degree.,
• the waveform selecting means further produces the first sectional waveform from the partial in-phase signal waveform and the partial quadrature signal waveform where the waveform selecting means outputs the first waveform as the partial in-phase signal waveform and the second waveform as the partial quadrature signal waveform, and
• the waveform selecting means further produces the second sectional waveform from the partial in-phase signal waveform and the partial quadrature signal waveform where the waveform selecting means outputs the first waveform as the partial quadrature signal waveform and the inverted second waveform as the partial in-phase signal waveform, and
• the waveform selecting means further produces the third sectional waveform from the partial in-phase signal waveform and the partial quadrature signal waveform where the waveform selecting means outputs the inverted first waveform as the partial in-phase signal waveform and the second inverted waveform as the partial quadrature signal waveform, and
• the waveform selecting means further produces the fourth sectional waveform from the partial in-phase signal waveform and the partial quadrature signal waveform where the waveform selecting means outputs the inverted first waveform as the partial quadrature signal waveform and the second waveform as the partial in-phase signal waveform,
• wherein the waveform generating equipment provides an in-phase signal waveform and a quadrature signal waveform based on the partial in-phase signal waveform and the partial quadrature waveform.

A waveform generating equipment for generating and outputting in-phase signal waveforms which are baseband signals of in-phase components and quadrature signal waveforms which are baseband signals of quadrature components, in quadrature modulated signals, the waveform generating equipment comprising:

• a first waveform generating means for generating (1) a first waveform having symbols or (2) an inverted first waveform that comprises the symbols of the first waveform inverted, as a first output waveform,
• a second waveform generating means for generating (1) a second waveform having symbols or (2) an inverted second waveform that comprises the symbols of the second waveform inverted, as a second output waveform,
• a waveform selecting means for providing either the first output waveform or the second output waveform as a partial in-phase signal waveform and the other one of the first output waveform and the second output waveform as a partial quadrature signal waveform,
• said waveform selecting means further produces at least a complex signal waveform comprising the partial in-phase signal waveform in one symbol time as a real part and the partial quadrature signal waveform as an imaginary part where the complex signal waveform is designated as a sectional waveform having a first sectional waveform, a second sectional waveform that is obtained by rotating a phase of the first sectional waveform 90.degree., a third sectional waveform that is obtained by rotating the phase of the first sectional waveform 180.degree., and a fourth sectional waveform that is obtained by rotating the phase of the first sectional waveform 270.degree.,
• the waveform selecting means further produces the first sectional waveform from the partial in-phase signal waveform and the partial quadrature signal waveform where the waveform selecting means outputs the first waveform as the partial in-phase signal waveform and the second waveform as the partial quadrature signal waveform, and
• the waveform selecting means further produces the second sectional waveform from the partial in-phase signal waveform and the partial quadrature signal waveform where the waveform selecting means outputs the first waveform as the partial quadrature signal waveform and the inverted second waveform as the partial in-phase signal waveform, and
• the waveform selecting means produces the third sectional waveform from the partial in-phase signal waveform and the partial quadrature signal waveform corresponding to the third sectional waveform, and the waveform selecting means outputs the inverted first waveform as the partial in-phase signal waveform and the inverted second waveform as the partial quadrature signal waveform, and
• the waveform selecting means further produces the fourth sectional waveform from the partial in-phase signal waveform and the partial quadrature signal waveform where the waveform selecting means outputs the inverted first waveform as the partial quadrature signal waveform and the second waveform as the partial in-phase signal waveform;
• wherein the waveform generating equipment provides an in-phase signal waveform and a quadrature signal waveform based on the partial in-phase signal waveform and the partial quadrature waveform,
• the waveform generating equipment further comprises:
• slot generating means that (1) receives data strings, (2) takes in data less than or equal to m bits successively from the data strings every one symbol time to form a data pattern comprising latest m.times.d bits of data where d is an integer greater than or equal to one and m is an integer greater than or equal to two, (3) divides the data patterns into d slots by separating the data pattern every m bits, and (4) outputs one of the d slots as a main slot and the remaining d-1 slots as sub slots,
• selecting signal generating means for generating and outputting 1-bit selecting signals using the main slot as an input and performing a carrying out logical operation on each bit of the main slot,
• an addressing signal generating means for (1) using the main slot and the d-1 sub slots as inputs, (2) performing a carrying out of a first bit operation and a second bit operation on the m.times.d bits comprising the main slot and the sub slots and forming an m.times.d-1 bit first addressing pattern and an m.times.d-1 bit second addressing pattern, respectively, and (3) generating and outputting a first addressing signal and a second addressing signal based on the first addressing pattern and the second addressing pattern, respectively,
• wherein the first waveform generating means and the second waveform generating means each have memories holding 2 (m.times.d-1) types of pulse waveforms for one symbol time, and one type of the types of the pulse waveforms for one symbol time is retrieved from each of the memories based on the first addressing signal and the second addressing signal, respectively, as the first waveform and second waveform, respectively, and
• the waveform selecting means further determines which one of the first waveform and the second waveform should be designated as an in-phase signal waveform, in response to the selecting signals.

A waveform generating equipment for generating and outputting in-phase signal waveforms which are baseband signals of in-phase components and quadrature signal waveforms which are baseband signals of quadrature components, in quadrature modulated signals, the waveform generating equipment comprising:

• a first waveform generating means for generating (1) a first waveform having symbols or (2) an inverted first waveform that comprises the symbols of the first waveform inverted, as a first output waveform,
• a second waveform generating means for generating (1) a second waveform having symbols or (2) an inverted second waveform that comprises the symbols of the second waveform inverted, as a second output waveform,
• a waveform selecting means for providing either the first output waveform or the second output waveform as a partial in-phase signal waveform and the other one of the first output waveform and the second output waveform as a partial quadrature signal waveform,
• said waveform selecting means further provides at least a complex signal waveform comprising the partial in-phase signal waveform in one symbol time as a real part and the partial quadrature signal waveform as an imaginary part where the complex signal waveform is designated as a sectional waveform having a first sectional waveform which is a specific sectional waveform, a second sectional waveform that is obtained by rotating the phase of the first sectional waveform 90.degree., a third sectional waveform that is obtained by rotating the phase of the first sectional waveform 180.degree., and a fourth sectional waveform that is obtained by rotating the phase of the first sectional waveform 270.degree.
• the waveform selecting means further provides the first sectional waveform from the partial in-phase signal waveform and the partial quadrature signal waveform where the waveform selecting means outputs the first waveform as the partial in-phase signal waveform and the second waveform as the partial quadrature signal waveform, and
• the waveform selecting means further produces the second sectional waveform from the partial in-phase signal waveform and the partial quadrature signal waveform where the waveform selecting means outputs the first waveform as the partial quadrature signal waveform and the inverted second waveform as the partial in-phase signal waveform, and
• the waveform selecting means further produces the third section waveform from the partial in-phase signal waveform and the partial quadrature signal waveform where the waveform selecting means outputs the inverted first waveform as the partial in-phase signal waveform and the inverted second waveform as the partial quadrature signal waveform, and
• the waveform selecting means further produces the fourth sectional waveform from the partial in-phase signal waveform and the partial quadrature signal waveform where the waveform selecting means outputs the inverted first waveform as the partial quadrature signal waveform and the second waveform as the partial in-phase signal waveform,
• wherein the waveform generating equipment provides an in-phase signal waveform and a quadrature signal waveform based on the partial in-phase signal waveform and the partial quadrature waveform,
• the waveform generating equipment further comprises:
• a plurality of waveform selecting means each having a corresponding one of the first waveform generating means and the second waveform generating means,
• a waveform synthesis means for generating the in-phase signal waveform by adding the partial in-phase signal waveform provided by each of the waveform selecting means and for generating quadrature signal waveforms by adding the partial quadrature signal waveform provided by each of the waveform selecting means,
• slot generating means that (1) receives data strings, (2) takes in data less than or equal to m bits successively from the data strings every one symbol time to form a data pattern comprising latest m.times.d bit data, (3) divides the data pattern into d slots by separating the data pattern every m bits, and (4) outputs s slots as a main slot and the remaining d-s sub slots, where d is an integer greater than or equal to one, m is an integer greater than or equal to two, s is an integer satisfying 1.ltoreq.s.ltoreq.d, i is an integer satisfying 1.ltoreq.i.ltoreq.s, and di is an integer and greater than or equal to one and di represents d1, d2, . . . ds, where d and di satisfy an expression:
• d1+d2+ . . . +ds=d
• selecting signal generating means for (1) generating and outputting 1-bit selecting signals using the s slots of the main slot as inputs and performing a carrying out logical operation on each bit composing the main slot, and (2) producing an s-bit selecting signal series by arranging the s slots of the 1-bit selecting signals,
• addressing signal generating means (1) using the s slots of the main slot and the d-s sub slots as inputs, (2) dividing the sub slots into s sub slot groups, (3) designating the number of the sub slots belonging to an i-th sub slot group as di-1, (4) carrying out a first bit operation and a second bit operation on m.times.di bits comprising an i-th main slot and the i-th sub slot group for each value of i, (5) forming an m.times.di-1 bit first addressing pattern and an m.times.di-1 bit second addressing pattern, and (6) generating and outputting s segments of first addressing signals and s segments of second addressing signals based on the first addressing pattern and the second addressing pattern, respectively,
• wherein there are s sections of the first waveform generating means, s sections of the second waveform generating means and s sections of waveform selecting means, and the i-th first waveform generating means has a memory which holds 2 (m.times.di-1) types of pulse waveforms for one symbol time, and reads out one type of pulse waveform for every one symbol time from the memory based on an i-th first addressing signal in a first addressing signal series, and outputs it as an i-th first waveform, and
• the i-th second waveform generating means has a memory which holds 2 (m.times.di-1) types of pulse waveforms for one symbol time, and reads out one type of pulse waveform for every one symbol time from the memories based on an i-th second addressing signal in a second addressing signal series, and outputs it as an i-th second waveform, and
• the i-th waveform selecting means determines which one of the i-th first waveform or the i-th second waveform should be designated as the partial in-phase signal waveform in accordance with an i-th selecting signal in the selecting signal series.