US 6,784,817 B2 · Data generating method, data generator, and transmitter using the same

Abstract

In the prior art, it has been difficult to provide a data generator and a data generating method which serve to implement an efficient transmitter, as well as a transmitter utilizing this data generator. The present invention provides a raw data generator that generates, from an inputted signal, an I signal and a Q signal which are orthogonal to each other and an amplitude component of a quadrature signal composed of the I and Q signals, a delta sigma modulator that delta-sigma-modulates the amplitude component, a first multiplier that outputs first data obtained by multiplexing normalized I data obtained by dividing the I signal by the amplitude component, by the delta-sigma-modulated signal, and a second multiplier that outputs second data obtained by multiplexing normalized Q data obtained by dividing the Q signal by the amplitude component, by the delta-sigma-modulated signal.

Claims25

Dependent claims

A data generating method comprising:

receiving an input signal to generate, from said signal, a quadrature signal composed of an I signal and a Q signal;
converting an amplitude component of said quadrature signal into a signal of a resolution lower than a resolution of said amplitude component;
dividing said I signal by the amplitude component of said quadrature signal to obtain normalized I data, multiplying said normalized I data by said converted signal to obtain first data, and outputting the first data;
and
dividing said Q signal by the amplitude component of said quadrature signal to obtain normalized Q data, multiplying said normalized Q data by said converted signal to obtain second data, and outputting the second data.

2 more elements

A data generator comprising:

raw data generating means of generating, from an inputted signal, an I signal and a Q signal which are orthogonal to each other as well as an amplitude component of a quadrature signal composed of said I signal and said Q signal;
converting means of converting said amplitude component into a signal of a resolution lower than a resolution of said amplitude component;
first multiplying means of multiplying normalized I data obtained by dividing said I signal by the amplitude component, by said converted signal to obtain first data, and outputting the first data;
and
second multiplying means of multiplying normalized Q data obtained by dividing said Q signal by the amplitude component, by said converted signal to obtain second data, and outputting the second data.

2 more elements

Dependencies are inferred from the claim text.

Data generating method, data generator, and transmitter using the same

Life of this patent

Data generating method, data generator, and transmitter using the same

Life of this patent

Abstract

Claims25