JP-7855895-B2 - Transmitter, mobile communication terminal, method of transmission by transmitter, and program

Inventors

• 野田 昂志

Assignees

• 日本電気株式会社

Dates

Publication Date

20260511

Application Date

20220329

Claims (5)

1. A phase modulator that modulates the phase of each of the two digital signals, A selector that periodically switches between and outputs one of two phase-modulated signal sequences, An amplifier that amplifies and outputs the output signal of the selector, Equipped with , The aforementioned phase modulator is An oscillator that generates a first oscillation signal which is a square wave of a first frequency and a second oscillation signal which is orthogonal to the first oscillation signal, A first mixer that uses the first oscillation signal to perform phase modulation on one of the two digital signals, A second mixer that uses the second oscillation signal to perform phase modulation on the other of the two digital signals, It has, The selector, with fc as the first frequency, selects and outputs one of the two phase-modulated signals by switching between them at a period of 2/fc. Transmitter.
2. One of the two digital signals is an in-phase channel signal, and the other of the two digital signals is an orthogonal channel signal. The transmitter according to claim 1 .
3. A mobile communication terminal comprising the transmitter according to claim 1 or 2 .
4. The phase modulation of each of the two digital signals is performed. It periodically switches between and selects one of two phase-modulated signal sequences to output. The selected signal is amplified and output. A transmission method using a transmitter, In the aforementioned phase modulation, Using an oscillator, a first oscillation signal, which is a rectangular wave of a first frequency, and a second oscillation signal, which is orthogonal to the first oscillation signal, are generated. In the first mixer, the phase modulation of one of the two digital signals is performed using the first oscillation signal. In the second mixer, the second oscillation signal is used to perform phase modulation on the other of the two digital signals. In the selected output of the two phase-modulated signals, If fc is the first frequency, then one of the two phase-modulated signals is selected and output while switching between them with a period of 2/fc. A method of transmission using a transmitter.
5. The process involves performing phase modulation on each of the two digital signals, A process that periodically switches between and selects one of two phase-modulated signal sequences to output, The process involves amplifying the selected and outputted signal and then outputting it again. A program that causes a computer to execute, The process for performing the aforementioned phase modulation is: A process that uses an oscillator to generate a first oscillation signal, which is a square wave of a first frequency, and a second oscillation signal that is orthogonal to the first oscillation signal. In the first mixer, the process involves using the first oscillation signal to perform phase modulation on one of the two digital signals, In the second mixer, the second oscillation signal is used to perform phase modulation on the other of the two digital signals, It has, The process of selecting and outputting the two phase-modulated signals is as follows: If fc is the first frequency, the process includes selecting and outputting one of the two phase-modulated signals while switching between them at a period of 2/fc. program.

Description

This disclosure relates to a transmitter, a mobile communication terminal, a transmission method using a transmitter, and a program. In recent years, development has progressed in miniaturizing mobile communication devices. Technologies related to mobile communication devices are disclosed, for example, in Patent Document 1. The transmitter for a mobile satellite communication terminal disclosed in Patent Document 1 comprises a Nyquist filter that removes high-frequency components from two orthogonal data sequences, an envelope equalizer that maintains a constant distance from the origin of the envelope when the two outputs of the Nyquist filter are represented on orthogonal axes, a phase modulator that performs phase modulation of the two output signals of the envelope equalizer, and a high-power amplifier that converts the output signal of the phase modulator into a high-frequency signal and amplifies it with high power. Japanese Patent Application Publication No. 7-231339 This is a block diagram illustrating the overview of the transmitter according to Embodiment 1.This is a block diagram showing a specific configuration example of the transmitter according to Embodiment 1.This is a block diagram showing an example configuration of an AD converter provided in the transmitter according to Embodiment 1.This is a block diagram showing an example configuration of a phase modulator provided in the transmitter according to Embodiment 1.This is a waveform diagram of the signal relating to the in-phase channel of the phase modulator provided in the transmitter according to Embodiment 1.This is a waveform diagram of the signal relating to the orthogonal channel of the phase modulator provided in the transmitter according to Embodiment 1.This is a waveform diagram of the input and output signals of a selector provided in the transmitter according to Embodiment 1.This is a flowchart showing the operation of the transmitter according to Embodiment 1. The embodiments will be described below with reference to the drawings. Note that the drawings are simplified, and the technical scope of the embodiments should not be narrowly interpreted based solely on their depiction. Furthermore, identical elements are denoted by the same reference numerals, and redundant explanations are omitted. In the following embodiments, the description will be divided into multiple sections or embodiments where necessary for convenience. However, unless otherwise specified, these are not unrelated; one may be a modification, application, detailed explanation, or supplementary explanation of part or all of the other. Furthermore, in the following embodiments, when referring to the number of elements (including quantity, numerical value, amount, range, etc.), unless otherwise specified or clearly limited to a specific number in principle, the number is not limited to that specific number and may be greater than or less than that number. Furthermore, in the following embodiments, the components (including operation steps, etc.) are not necessarily essential unless specifically stated or considered fundamentally essential. Similarly, in the following embodiments, when referring to the shape, positional relationship, etc., of the components, unless specifically stated or considered fundamentally different, it shall include those substantially similar to or resembling their shape, etc. The same applies to the numbers, etc. (including quantity, numerical value, amount, range, etc.). <Embodiment 1> Figure 1 is a block diagram showing an overview of the transmitter 100 according to Embodiment 1. The transmitter 100 according to this embodiment is mounted on, for example, a mobile communication terminal and transmits signals to an external device such as a base station. The mobile communication terminal is a mobile communication terminal, such as a smartphone, tablet, or wearable device. In this embodiment, the transmitter 100 removes unwanted wavelength signal components from the output signal of the phase modulator using a selector, and then amplifies the output signal of the phase modulator from which the unwanted wavelength signal components have been removed using a power amplifier. As a result, in the transmitter 100 according to this embodiment, the circuit configuration for processing unwanted wavelength signal components generated in the phase modulator is simplified, thereby suppressing an increase in circuit size. This also suppresses an increase in cost. A detailed explanation follows below. As shown in Figure 1, the transmitter 100 includes at least a phase modulator 150, a selector 160, and a power amplifier 170. The phase modulator 150 modulates the phase of each of the two digital signals Di3 and Dq3, and outputs two high-frequency signals Di4 and Dq4. In other words, the phase modulator 150 upconverts the frequencies of each of the two digital signals Di3 and Dq3 to an arbitrary frequency and outputs two high-frequency signals Di4 and