JP6637645B1

JP6637645B1 - Quadrature modulator

Info

Publication number: JP6637645B1
Application number: JP2018199801A
Authority: JP
Inventors: 三浦　進; 進三浦
Original assignee: Denki Kogyo Co Ltd
Current assignee: DKK Co Ltd
Priority date: 2018-10-24
Filing date: 2018-10-24
Publication date: 2020-01-29
Anticipated expiration: 2038-10-24
Also published as: JP2020068446A

Abstract

【課題】本発明は、細かなフィードバックなく、誤差を抑制できる直交変調器を提供する。【解決手段】直交変調器は、第一副直交変調器、第二副直交変調器、全体位相変換器、および、出力加算器を備える。第一直交変調器と第二直交変調器は略同一の特性を備える。第一副直交変調器の第一搬送波と、第二副直交変調器の第二搬送波について、位相差を９０度以上１８０度以下とする。そして、出力加算器において、第一加算器および第二加算器の出力を加算する。【選択図】図４The present invention provides a quadrature modulator capable of suppressing errors without fine feedback. A quadrature modulator includes a first sub-quadrature modulator, a second sub-quadrature modulator, an overall phase converter, and an output adder. The first quadrature modulator and the second quadrature modulator have substantially the same characteristics. The phase difference between the first carrier of the first sub-quadrature modulator and the second carrier of the second sub-quadrature modulator is 90 degrees or more and 180 degrees or less. Then, in the output adder, the outputs of the first adder and the second adder are added. [Selection diagram] FIG.

Description

本発明は、直交変調器に関する。 The present invention relates to a quadrature modulator.

キャリアリークを抑制するため、単一の直交変調器において、誤差をフィードバックする発明が記載されている（特許文献１〜３）。
直交変調器では、誤差として、キャリアリーク、イメージリークがあり、双方が小さいことが求められる。
図１３は、直交変調器、いわゆるＩ／Ｑ変調器の構成例を示す。
直交変調器において、角周波数ωｃの搬送波をベースバンド信号ｉ（ｔ）、ｑ（ｔ）で直交変調したとき、変調波は、下記の式（１）のように表される。

ここでｔは時間を示す。
しかし、実際には直交変調器には誤差があり、Ｉ成分乗算器およびＱ成分乗算器において、それぞれ、ゲインをＧｉ、Ｇｑ、直流オフセットをＯｉ、Ｏｑとし、Ｉ成分乗算器およびＱ成分乗算器の直交誤差をθｅとすると、変調波は、下記の式（２）のように表される。

Patent Documents 1 to 3 disclose inventions in which an error is fed back in a single quadrature modulator to suppress carrier leak.
In the quadrature modulator, there are carrier leak and image leak as errors, and it is required that both are small.
FIG. 13 shows a configuration example of a quadrature modulator, a so-called I / Q modulator.
In a quadrature modulator, when a carrier having an angular frequency ωc is quadrature-modulated with baseband signals i (t) and q (t), the modulated wave is represented by the following equation (1).

Here, t indicates time.
However, the quadrature modulator actually has an error. In the I component multiplier and the Q component multiplier, the gains are Gi and Gq, the DC offsets are Oi and Oq, respectively, and the I component multiplier and the Q component multiplier are Assuming that the orthogonal error of θ is θe, the modulated wave is represented by the following equation (2).

図１４は、直交変調器における補正を示す。
直交変調器のＩ成分、Ｑ成分に入力する信号をそれぞれ、下記の式（３）、式（４）のとおりに補正すると、この直交変調器の出力は下記の式（５）となり、誤差が補正できる。

FIG. 14 shows the correction in the quadrature modulator.
When the signals input to the I component and the Q component of the quadrature modulator are respectively corrected according to the following equations (3) and (4), the output of the quadrature modulator becomes the following equation (5), and the error becomes Can be corrected.

特許第４３４１４１８号明細書Patent No. 4344118 特許第４７５５６６９号明細書Patent No. 4755669 特許第６２０９２３９号明細書Patent No. 6209239

単一の直交変調器において、誤差を抑制するためにフィードバックを行う従来の方法では、フィードバックのために通信など本来の変調器の機能を制約してしまう。また、随時フィードバックを行うための回路が別途必要となる。
本発明は、フィードバックがなくとも、誤差の抑制が可能な直交変調器を提供することを目的とする。
In the conventional method of performing feedback to suppress an error in a single quadrature modulator, the function of the original modulator such as communication is restricted due to the feedback. Further, a circuit for performing feedback as needed is separately required.
An object of the present invention is to provide a quadrature modulator capable of suppressing errors without feedback.

本発明の請求項１に係る直交変調器は、全体搬送波信号入力端、全体Ｉ入力端、全体Ｑ入力端、入力位相反転器、全体出力端、第一副直交変調器、第二副直交変調器、全体位相変換器、および、出力加算器を備え、前記第一副直交変調器は、第一搬送波信号入力端、第一Ｉ入力端、第一Ｑ入力端、前記第一搬送波信号入力端から第一搬送波を受信し、前記第一搬送波と同相の第一同相信号、および前記第一搬送波と直交する第一直交信号を出力する第一ベースバンド部、前記第一Ｉ入力端から入力される第一Ｉ入力信号を前記第一同相信号と乗算する第一Ｉ成分乗算器、前記第一Ｑ入力端から入力される第一Ｑ入力信号を前記第一直交信号と乗算する第一Ｑ成分乗算器、前記第一Ｉ成分乗算器の出力および前記第一Ｑ成分乗算器の出力を加算する第一加算器、を備え、前記第二副直交変調器は、第二搬送波信号入力端、第二Ｉ入力端、第二Ｑ入力端、前記第二搬送波信号入力端から第二搬送波を受信し、前記第二搬送波と同相の第二同相信号、および前記第二搬送波と直交する第二直交信号を出力する第二ベースバンド部、前記第二Ｉ入力端から入力される第二Ｉ入力信号を前記第二同相信号と乗算する第二Ｉ成分乗算器、前記第二Ｑ入力端から入力される第二Ｑ入力信号を前記第二直交信号と乗算する第二Ｑ成分乗算器、前記第二Ｉ成分乗算器の出力および前記第二Ｑ成分乗算器の出力を加算する第二加算器、を備え、前記第一副直交変調器と前記第二副直交変調器は略同一の特性を備え、前記全体I入力端は、前記第一Ｉ入力端、前記第二Ｑ入力端に接続され、前記全体Ｑ入力端は、前記第一Ｑ入力端に接続され、かつ、前記入力位相反転器を介して前記第二I入力端に接続され、前記全体位相変換器は、前記全体搬送波信号入力端、前記第一搬送波信号入力端、前記第二搬送波信号入力端に接続され、前記全体搬送波信号入力端から入力される全体搬送波を受信して前記、第一搬送波を前記第一搬送波信号入力端に、前記第一搬送波と９０度以上１８０度以下位相の異なる前記第二搬送波を前記第二搬送波信号入力端に出力し、前記出力加算器は前記全体出力端に接続され、前記第一加算器および前記第二加算器の出力を加算することを特徴とする、直交変調器である。
本構成により、フィードバックがなくともキャリアリーク、イメージリークによる誤差を抑制することが可能となる。

本発明の請求項２に係る直交変調器は、前記全体搬送波信号入力端と前記第一搬送波信号入力端とが接続され、前記全体搬送波信号入力端と前記第二搬送波信号入力端との間に前記全体位相変換器が接続されている、請求項１に記載の直交変調器である。
本構成により、例えば、従来の直交変調器として使用されている第一副直交変調器に対して並列に、第二副直交器などの構成を追加することにより、従来の直交変調器を容易に本発明の請求項１に係る直交変調器と同様の効果を奏する直交変調器に変更することができる。

本発明の請求項３に係る直交変調器は、前記全体搬送波信号を受信し前記第一搬送波と前記第二搬送波を出力する前記全体位相変換器は、前記第一搬送波と前記第二搬送波との位相を９０度以上１８０度以下の範囲で任意の位相差で出力する可変移相器であることを特徴とする、請求項１に記載の直交変調器である。
本構成により、例えば直交変調器の周囲の構成要素や環境の変化に応じた位相調整が可能となる。

本発明の請求項４に係る直交変調器は、前記全体位相変換器に接続された位相調整部を備え、前記位相調整部は、キャリアリークに対応したキャリアリーク信号を受信するキャリアリーク信号受信端を有し、かつ、イメージリークに対応したイメージリーク信号を受信するイメージリーク信号受信端を有するノイズ信号受信部、受信した前記キャリアリーク信号、および、前記イメージリーク信号に応じた位相調整信号を生成し、前記全体位相変換器に出力する位相調整信号生成部を有し、前記全体位相変換器は前記位相調整部に接続され、受信した前記位相調整信号に応じて位相を変更することを特徴とする、請求項３に記載の直交変調器である。
本構成により、例えば直交変調器の稼働中にも、キャリアリーク、イメージリークに対応した位相調整が可能となる。

本発明の請求項５に係る直交変調器は、前記位相調整部は、データテーブルを保存するデータテーブル記憶部を有し、前記位相調整信号生成部は、前記第一搬送波と前記第二搬送波の位相差について、２以上の位相差における前記キャリアリーク信号および前記イメージリーク信号を受信し、前記データテーブルを参照して前記位相調整信号を生成することを特徴とする、請求項４に記載の直交変調器である。
本構成による直交変調器では、キャリアリーク量およびイメージリーク量がほぼ同様の特性を持つことが多いため、本構成におけるようにデータテーブルを参照して位相調整信号を生成することが極めて有効となる。

本発明の請求項６に係る直交変調器は、前記位相調整部は、通信中に位相差を増大または減少させる位相増減部を備え、前記位相増減部が位相差を増大させた後にノイズ信号が減少したときは位相差を増大させ、位相増減部が位相差を減少させた後にノイズ信号が減少したときは位相差を減少させる、フィードバックを行うことを特徴とする、請求項４または５のいずれかに記載の直交変調器である。
本構成による直交変調器では、第一搬送波と第二搬送波の位相差について、９０度から１８０度の間で、９０度から位相差が増加するとキャリアリークが減少し、１８０度から位相差が減少するとイメージリーク減少するため、本構成による単純なフィードバックが有効に働く。

本発明の請求項７に係る通信器は、請求項４ないし６のいずれかに記載の直交変調器を備えた通信器であって、前記ノイズ信号受信機は、通信開始前または通信中に前記キャリアリーク信号または前記イメージリーク信号を受信し、前記位相調整信号生成部は、受信した前記キャリアリーク信号、および、前記イメージリーク信号に応じた前記位相調整信号を生成して前記全体位相変換器に出力し、前記全体位相変換器は前記位相調整部に接続され、受信した前記位相調整信号に応じて位相を変更することを特徴とする、通信器である。

本構成による直交変調器はフィードバックなく、あるいは、短時間に誤差を抑制できるため、通信前の短時間に、あるいは、通信中のわずかな時間で誤差を抑制できるため、通信器本来の性能に大きな影響を与えることがない。
The quadrature modulator according to claim 1 of the present invention comprises a total carrier signal input terminal, a total I input terminal, a total Q input terminal, an input phase inverter, a total output terminal, a first sub quadrature modulator, and a second sub quadrature modulation. Modulator, an overall phase converter, and an output adder, wherein the first sub-quadrature modulator has a first carrier signal input terminal, a first I input terminal, a first Q input terminal, and the first carrier signal input terminal. From the first carrier, the first in-phase signal in phase with the first carrier, and a first baseband unit that outputs a first quadrature signal orthogonal to the first carrier, from the first I input terminal A first I-component multiplier for multiplying the input first I-input signal by the first in-phase signal; multiplying the first Q-input signal input from the first Q-input terminal by the first quadrature signal; Adding a first Q component multiplier, an output of the first I component multiplier, and an output of the first Q component multiplier A second adder, the second sub-quadrature modulator receiving a second carrier from a second carrier signal input, a second I input, a second Q input, and the second carrier signal input. A second baseband unit that outputs a second in-phase signal in phase with the second carrier and a second quadrature signal orthogonal to the second carrier; a second I input input from the second I input terminal A second I component multiplier for multiplying a signal by the second in-phase signal, a second Q component multiplier for multiplying a second Q input signal input from the second Q input terminal by the second quadrature signal, A second adder for adding the output of the second I component multiplier and the output of the second Q component multiplier, wherein the first sub-quadrature modulator and the second sub-quadrature modulator have substantially the same characteristics. The overall I input terminal is connected to the first I input terminal and the second Q input terminal, and the overall I input terminal , Connected to the first Q input terminal, and connected to the second I input terminal via the input phase inverter, wherein the entire phase converter includes the entire carrier signal input terminal, the first carrier signal An input end, connected to the second carrier signal input end, receives the entire carrier input from the entire carrier signal input end, the first carrier to the first carrier signal input end, the first carrier and The second carrier having a phase difference of 90 degrees or more and 180 degrees or less is output to the second carrier signal input terminal, and the output adder is connected to the overall output terminal, and the first adder and the second adder A quadrature modulator characterized by adding outputs.
With this configuration, it is possible to suppress errors due to carrier leak and image leak even without feedback.

The quadrature modulator according to claim 2 of the present invention, wherein the entire carrier signal input terminal and the first carrier signal input terminal are connected, and between the entire carrier signal input terminal and the second carrier signal input terminal. 2. The quadrature modulator according to claim 1, wherein the whole phase converter is connected.
With this configuration, for example, by adding a configuration such as a second sub-quadrature modulator in parallel with the first sub-quadrature modulator used as a conventional quadrature modulator, the conventional quadrature modulator can be easily configured. A quadrature modulator having the same effect as the quadrature modulator according to claim 1 of the present invention can be changed.

The quadrature modulator according to claim 3 of the present invention is configured such that the whole phase converter that receives the whole carrier signal and outputs the first carrier and the second carrier is the first phase shifter and the second carrier. The quadrature modulator according to claim 1, wherein the quadrature modulator is a variable phase shifter that outputs a phase with an arbitrary phase difference in a range of 90 degrees or more and 180 degrees or less.
With this configuration, for example, phase adjustment can be performed in accordance with changes in components around the quadrature modulator and the environment.

A quadrature modulator according to claim 4 of the present invention includes a phase adjuster connected to the overall phase converter, wherein the phase adjuster receives a carrier leak signal corresponding to a carrier leak. And a noise signal receiving unit having an image leak signal receiving end for receiving an image leak signal corresponding to the image leak, generating the received carrier leak signal, and a phase adjustment signal according to the image leak signal And a phase adjustment signal generator for outputting to the whole phase converter, wherein the whole phase converter is connected to the phase adjustment unit, and changes a phase according to the received phase adjustment signal. 4. The quadrature modulator according to claim 3, wherein
According to this configuration, for example, even during operation of the quadrature modulator, phase adjustment corresponding to carrier leak and image leak can be performed.

The quadrature modulator according to claim 5 of the present invention, wherein the phase adjustment unit has a data table storage unit that stores a data table, and the phase adjustment signal generation unit is configured to generate the first carrier wave and the second carrier wave. 5. The quadrature according to claim 4, wherein for the phase difference, the carrier leak signal and the image leak signal at two or more phase differences are received, and the phase adjustment signal is generated with reference to the data table. 6. Modulator.
In the quadrature modulator according to the present configuration, the carrier leak amount and the image leak amount often have substantially the same characteristics. Therefore, it is extremely effective to generate the phase adjustment signal by referring to the data table as in the present configuration. .

The quadrature modulator according to claim 6 of the present invention, wherein the phase adjusting unit includes a phase increasing / decreasing unit that increases or decreases a phase difference during communication, and a noise signal is generated after the phase increasing / decreasing unit increases the phase difference. 6. The feedback according to claim 4, wherein the phase difference is increased when the phase difference is decreased, and the phase difference is decreased when the noise signal is decreased after the phase increasing / decreasing unit reduces the phase difference. Or a quadrature modulator described in
In the quadrature modulator according to the present configuration, as for the phase difference between the first carrier and the second carrier, the carrier leak decreases when the phase difference increases from 90 degrees to 180 degrees, and the phase difference decreases from 180 degrees. Then, since the image leak is reduced, the simple feedback by this configuration works effectively.

A communication device according to claim 7 of the present invention is a communication device including the quadrature modulator according to any one of claims 4 to 6, wherein the noise signal receiver is configured to perform the communication before starting communication or during communication. A carrier leak signal or the image leak signal is received, and the phase adjustment signal generation unit generates the phase adjustment signal according to the received carrier leak signal, and the image leak signal, and sends the phase adjustment signal to the entire phase converter. The communication device is characterized in that the whole phase converter outputs the signal and is connected to the phase adjustment unit, and changes a phase according to the received phase adjustment signal.

The quadrature modulator according to this configuration can suppress the error without feedback or in a short time, and therefore can suppress the error in a short time before communication or in a short time during communication, and greatly affects the original performance of the communication device. Has no effect.

本発明の一実施例における、直交変調器の構成例を示す。1 shows a configuration example of a quadrature modulator in one embodiment of the present invention. 本発明の一実施例における、第一副直交変調器の構成例を示す。2 shows a configuration example of a first sub-quadrature modulator in one embodiment of the present invention. 本発明の一実施例における、第二副直交変調器の構成例を示す。4 shows a configuration example of a second sub-quadrature modulator in one embodiment of the present invention. 本発明の一実施例における、直交変調器の構成例を示す。1 shows a configuration example of a quadrature modulator in one embodiment of the present invention. 本発明の一実施例における、直交変調器の構成例を示す。1 shows a configuration example of a quadrature modulator in one embodiment of the present invention. 本発明の一実施例における、直交変調器の構成例を示す。1 shows a configuration example of a quadrature modulator in one embodiment of the present invention. 本発明の一実施例における、直交変調器の構成例を示す。1 shows a configuration example of a quadrature modulator in one embodiment of the present invention. 本発明の一実施例における、直交変調器の構成例を示す。1 shows a configuration example of a quadrature modulator in one embodiment of the present invention. 本発明の一実施例における、直交変調器の構成例を示す。1 shows a configuration example of a quadrature modulator in one embodiment of the present invention. 本発明の一実施例における、直交変調器の構成例を示す。1 shows a configuration example of a quadrature modulator in one embodiment of the present invention. 本発明の一実施例における、第一搬送波と第二搬送波の位相差とリーク量の関係を示す。5 shows a relationship between the phase difference between the first carrier and the second carrier and the amount of leakage in one embodiment of the present invention. 本発明の一実施例における、直交変調器を備えた通信器を示す。1 illustrates a communication device including a quadrature modulator according to an embodiment of the present invention. 直交変調器、いわゆるＩ／Ｑ変調器の構成例を示す。1 shows a configuration example of a quadrature modulator, a so-called I / Q modulator. 直交変調器における補正を示す。4 illustrates correction in a quadrature modulator.

以下、本発明における直交変調器の実施例を説明する。なお、従来例と同様の事項は説明を省略する場合がある。
図１は本発明の一実施例における直交変調器３００を示す。
本実施例において、直交変調器３００は、全体搬送波信号入力端１（TLin）、全体I入力端２（TIin）、全体Q入力端３（TQin）、入力位相反転器１０（PI）、全体出力端４（Tout）、第一副直交変調器１００、第二副直交変調器２００、全体位相変換器２０、および、出力加算器３０を備える。 Hereinafter, embodiments of the quadrature modulator according to the present invention will be described. Note that description of the same items as in the conventional example may be omitted.
FIG. 1 shows a quadrature modulator 300 according to one embodiment of the present invention.
In this embodiment, the quadrature modulator 300 includes a total carrier signal input terminal 1 (TLin), a total I input terminal 2 (TIin), a total Q input terminal 3 (TQin), an input phase inverter 10 (PI), and a total output. An end 4 (Tout), a first sub quadrature modulator 100, a second sub quadrature modulator 200, an overall phase converter 20, and an output adder 30 are provided.

図２は本発明の一実施例における、第一副直交変調器１００の構成例を示す。
第一副直交変調器１００は、第一搬送波信号入力端１０１（ＴＬｉｎ２）、第一I入力端１０２（ＴＩｉｎ２）、第一Q入力端１０３（ＴＱｉｎ２）、第一ベースバンド部１１０、第一I成分乗算器１２０、第一Q成分乗算器１３０、および、第一加算器１４０を備える。
第一ベースバンド部１１０は、第一搬送波信号入力端１０１から第一搬送波を受信し、第一搬送波と同相の第一同相信号、および第一搬送波と直交する第一直交信号を出力する。
第一I成分乗算器１２０は、第一I入力端１０２から入力される第一Ｉ入力信号を第一同相信号と乗算する。同様に、第一Q成分乗算器１３０は、第一Q入力端１０３から入力される第一Ｑ入力信号を第一直交信号と乗算する。そして、第一加算器１４０は、第一I成分乗算器１２０の出力および第一Q成分乗算器１３０の出力を第一副出力端１０４から加算する。 FIG. 2 shows a configuration example of the first sub-quadrature modulator 100 in one embodiment of the present invention.
The first sub quadrature modulator 100 includes a first carrier signal input terminal 101 (TLin2), a first I input terminal 102 (TIin2), a first Q input terminal 103 (TQin2), a first baseband unit 110, a first I A component multiplier 120, a first Q component multiplier 130, and a first adder 140 are provided.
The first baseband unit 110 receives the first carrier from the first carrier signal input terminal 101, and outputs a first in-phase signal in phase with the first carrier, and a first quadrature signal orthogonal to the first carrier. .
The first I component multiplier 120 multiplies the first I input signal input from the first I input terminal 102 by the first in-phase signal. Similarly, the first Q component multiplier 130 multiplies the first Q input signal input from the first Q input terminal 103 by the first quadrature signal. Then, the first adder 140 adds the output of the first I component multiplier 120 and the output of the first Q component multiplier 130 from the first sub output terminal 104.

図３は本発明の一実施例における、第二副直交変調器２００の構成例を示す。
第二副直交変調器２００は、第二搬送波信号入力端２０１（ＴＬｉｎ２）、第二I入力端２０２（ＴＩｉｎ２）、第二Q入力端２０３（ＴＱｉｎ２）、第二ベースバンド部２１０、第二I成分乗算器２２０、第二Q成分乗算器２３０、および、第二加算器２４０を備える。
第二ベースバンド部２１０は、第二搬送波信号入力端２０１から第二搬送波を受信し、第二搬送波と同相の第二同相信号、および第二搬送波と直交する第二直交信号を出力する。
第二I成分乗算器２２０は、第二I入力端２０２から入力される第二Ｉ入力信号を第二同相信号と乗算する。同様に、第二Q成分乗算器２３０は、第二Q入力端２０３から入力される第二Ｑ入力信号を第二直交信号と乗算する。そして、第二加算器２４０は、第二I成分乗算器２２０の出力および第二Q成分乗算器２３０の出力を第二副出力端２０４から加算する。 FIG. 3 shows a configuration example of the second sub-quadrature modulator 200 in one embodiment of the present invention.
The second sub-quadrature modulator 200 includes a second carrier signal input terminal 201 (TLin2), a second I input terminal 202 (TIin2), a second Q input terminal 203 (TQin2), a second baseband unit 210, a second I A component multiplier 220, a second Q component multiplier 230, and a second adder 240 are provided.
The second baseband unit 210 receives the second carrier from the second carrier signal input terminal 201, and outputs a second in-phase signal in phase with the second carrier and a second quadrature signal orthogonal to the second carrier.
The second I component multiplier 220 multiplies the second I input signal input from the second I input terminal 202 by the second in-phase signal. Similarly, the second Q component multiplier 230 multiplies the second quadrature signal by the second Q input signal input from the second Q input terminal 203. Then, the second adder 240 adds the output of the second I component multiplier 220 and the output of the second Q component multiplier 230 from the second sub output terminal 204.

第一副直交変調器と第二副直交変調器は略同一の特性を有する。ここで、「略同一の特性を有する」とは、周波数特性、キャリアリーク、イメージリークがほぼ同一であることを言う。
全体I入力端２は、第一I入力端１０２、第二Q入力端２０３に接続され、全体Q入力端３は、第一Q入力端１０３に接続され、かつ、位相反転器を介して第二I入力端２０２に接続される。
全体搬送波信号入力端１と第一搬送波信号入力端１０１とが接続され、全体搬送波信号入力端１と第二搬送波信号入力端２０１との間に全体位相変換器２０が接続されている。
全体位相変換器２０は、全体搬送波信号入力端１から入力される全体搬送波を受信して、第一搬送波を第一搬送波信号入力端１０１に、第一搬送波と９０度位相の異なる第二搬送波を第二搬送波信号入力端２０１に出力する。 The first sub-quadrature modulator and the second sub-quadrature modulator have substantially the same characteristics. Here, "having substantially the same characteristics" means that frequency characteristics, carrier leak, and image leak are substantially the same.
The whole I input terminal 2 is connected to the first I input terminal 102 and the second Q input terminal 203, and the whole Q input terminal 3 is connected to the first Q input terminal 103. It is connected to the second I input terminal 202.
The whole carrier signal input terminal 1 and the first carrier signal input terminal 101 are connected, and the whole phase converter 20 is connected between the whole carrier signal input terminal 1 and the second carrier signal input terminal 201.
The whole phase converter 20 receives the whole carrier inputted from the whole carrier signal input terminal 1 and sends the first carrier to the first carrier signal input terminal 101 and the second carrier having a phase difference of 90 degrees from that of the first carrier. Output to the second carrier signal input terminal 201.

ここで、全体位相変換器２０は、第一搬送波と第二搬送波の位相が９０度異なるものを出力するものであれば、例えば、全体位相変換器２０は、全体搬送波信号入力端１、第一搬送波信号入力端１０１、第二搬送波信号入力端２０１に接続される構成としてもよい。 Here, if the overall phase converter 20 outputs a phase difference between the first carrier and the second carrier by 90 degrees, for example, the overall phase converter 20 includes the entire carrier signal input terminal 1 and the first It may be configured to be connected to the carrier signal input terminal 101 and the second carrier signal input terminal 201.

出力加算器３０は全体出力端４に接続されており、第一加算器１４０および第二加算器２４０の出力を加算して、全体出力端４に出力する。
第一搬送波と９０度位相の遅れた第二搬送波を第二搬送波信号入力端２０１に出力するとき、第二副直交変調器２００からの出力ｍｏｄ１は下記の式（６）のとおりとなる。

そして、第一副直交変調器１００および第二副直交変調器２００の出力を出力加算器３０において加算すると、下記の式（７）、式（８）のとおりとなる。

つまり、ゲイン誤差と直交誤差をキャンセルできる。本構成により、フィードバックがなくとも誤差を抑制することが可能となる。 The output adder 30 is connected to the overall output terminal 4, adds the outputs of the first adder 140 and the second adder 240 and outputs the result to the overall output terminal 4.
When the second carrier wave delayed by 90 degrees from the first carrier wave is output to the second carrier signal input terminal 201, the output mod1 from the second sub-quadrature modulator 200 is as shown in the following equation (6).

Then, when the outputs of the first sub-orthogonal modulator 100 and the second sub-orthogonal modulator 200 are added in the output adder 30, the following equations (7) and (8) are obtained.

That is, the gain error and the quadrature error can be canceled. With this configuration, it is possible to suppress the error without feedback.

次に、オフセット誤差をキャンセルする構成例を示す。図４は、本発明の一実施例における、直交変調器３００の構成例を示す。 Next, a configuration example for canceling the offset error will be described. FIG. 4 shows a configuration example of the quadrature modulator 300 in one embodiment of the present invention.

全体I入力端２は、第一I入力端１０２に接続され、かつ、位相反転器を介して第二I入力端２０２に接続される。また、全体Q入力端３は、第一Q入力端１０３に接続され、かつ、位相反転器を介して第二Q入力端２０３に接続される。
つまり、第一副直交変調器１００の第一I入力端１０２（ＴＩｉｎ１）にｉ（ｔ）、第一Q入力端１０３（ＴＱｉｎ１）にｑ（ｔ）、第二副直交変調器２００の第二I入力端２０２（ＴＩｉｎ２）に−ｉ（ｔ）、第二I入力端２０２（ＴＱｉｎ２）にーｑ（ｔ）が入力される。 The overall I input 2 is connected to the first I input 102 and to the second I input 202 via a phase inverter. Further, the whole Q input terminal 3 is connected to the first Q input terminal 103 and is connected to the second Q input terminal 203 via a phase inverter.
That is, i (t) is input to the first I input terminal 102 (TIin1) of the first sub-quadrature modulator 100, q (t) is input to the first Q input terminal 103 (TQin1), and the second -I (t) is input to the I input terminal 202 (TIin2), and -q (t) is input to the second I input terminal 202 (TQin2).

本実施例において、第二副直交変調器２００の出力ｍｏｄ２は、下記の式（９）のとおりとなる。

そして、第一副直交変調器１００および第二副直交変調器２００の出力は、出力加算器３０において加算され、下記の式（１０）のとおりとなる。

つまり、オフセット誤差をキャンセルできる。本構成により、フィードバックがなくとも誤差を抑制することが可能となる。 In the present embodiment, the output mod2 of the second sub-quadrature modulator 200 is represented by the following equation (9).

Then, the outputs of the first sub-orthogonal modulator 100 and the second sub-orthogonal modulator 200 are added in the output adder 30 to obtain the following equation (10).

That is, the offset error can be canceled. With this configuration, it is possible to suppress the error without feedback.

続いて、別の実施例を示す。図５は、本発明の一実施例における、直交変調器３００の構成例を示す。
本実施例においては、既述の実施例において第一搬送波と９０度位相の異なる第二搬送波を第二搬送波信号入力端２０１に出力することに替えて、第一搬送波と９０度以上１８０度以下位相の異なる第二搬送波を第二搬送波信号入力端２０１に出力する点が異なる。
全体I入力端２は、第一I入力端１０２、第二Q入力端２０３に接続される。また、全体Q入力端３は、第一Q入力端１０３に接続され、かつ、位相反転器を介して第二I入力端２０２に接続される。
つまり、第一副直交変調器１００の第一I入力端１０２（ＴＩｉｎ１）にｉ（ｔ）、第一Q入力端１０３（ＴＱｉｎ１）にｑ（ｔ）、第二副直交変調器２００の第二I入力端２０２（ＴＩｉｎ２）に−ｑ（ｔ）、第二I入力端２０２（ＴＱｉｎ２）にーｉ（ｔ）が入力される。 Subsequently, another embodiment will be described. FIG. 5 shows a configuration example of the quadrature modulator 300 in one embodiment of the present invention.
In this embodiment, in place of outputting the second carrier having a phase different from that of the first carrier by 90 degrees to the second carrier signal input terminal 201 in the above-described embodiment, the first carrier is 90 degrees or more and 180 degrees or less. The difference is that the second carrier having a different phase is output to the second carrier signal input terminal 201.
The whole I input terminal 2 is connected to the first I input terminal 102 and the second Q input terminal 203. Further, the overall Q input terminal 3 is connected to the first Q input terminal 103 and is connected to the second I input terminal 202 via a phase inverter.
That is, i (t) is input to the first I input terminal 102 (TIin1) of the first sub-quadrature modulator 100, q (t) is input to the first Q input terminal 103 (TQin1), and the second -Q (t) is input to the I input terminal 202 (TIin2), and -i (t) is input to the second I input terminal 202 (TQin2).

第二副直交変調器２００の第二搬送波信号入力端２０１に入力される搬送波の位相が―ηのとき、本構成例において、第二副直交変調器２００の出力ｍｏｄ２は、式（１１）となる。

そして、第一副直交変調器１００および第二副直交変調器２００の出力を出力加算器３０において加算すると、下記の式（１２）、式（１３）、式（１４）のとおりとなる。

When the phase of the carrier input to the second carrier signal input terminal 201 of the second sub-quadrature modulator 200 is −η, in the present configuration example, the output mod2 of the second sub-quadrature modulator 200 is expressed by the equation (11). Become.

Then, when the outputs of the first sub-quadrature modulator 100 and the second sub-quadrature modulator 200 are added in the output adder 30, the following equations (12), (13), and (14) are obtained.

なお、本明細書中において、イメージリーク（振幅比）の算出には以下の式（１５）を用いている。

本構成により、フィードバックがなくともキャリアリーク、イメージリークによる誤差を抑制することが可能となる。 In the present specification, the following equation (15) is used for calculating the image leak (amplitude ratio).

With this configuration, it is possible to suppress errors due to carrier leak and image leak even without feedback.

本実施例においては、第一搬送波と第二搬送波の位相を９０度以上１８０度以下異ならせるものであれば、全体搬送波信号入力端１と第一搬送波信号入力端１０１との間に全体位相変換器２０を接続し、かつ、全体搬送波信号入力端１と第二搬送波信号入力端２０１を接続する構成、あるいは、全体搬送波信号入力端１と第二搬送波信号との間に全体位相変換器２０を接続し、かつ、全体搬送波信号入力端１と第一搬送波信号入力端１０１を接続する構成としてもよい。 In this embodiment, if the phases of the first carrier and the second carrier are different from each other by 90 degrees or more and 180 degrees or less, the entire phase conversion between the entire carrier signal input terminal 1 and the first carrier signal input terminal 101 is performed. And the whole carrier signal input terminal 1 and the second carrier signal input terminal 201 are connected, or the whole phase converter 20 is connected between the whole carrier signal input terminal 1 and the second carrier signal. It may be configured to connect and connect the entire carrier signal input terminal 1 and the first carrier signal input terminal 101.

図６は、本発明の一実施例における、直交変調器３００の構成例を示す。図６に示される直交変調器３００は、全体搬送波信号入力端１と第一搬送波信号入力端１０１とが接続され、全体搬送波信号入力端１と第二搬送波信号入力端２０１との間に全体位相変換器２０が接続されており、その他の構成は前述の構成例と同様である。
本構成により、例えば、従来の直交変調器として使用されている第一副直交変調器１００に対して並列に、第二副直交器、全体位相変換器２０、位相反転器、出力加算器３０を追加することにより、従来の直交変調器を容易に前述の構成例を有する直交変調器３００と同様の効果を奏する直交変調器３００に変更することができる。 FIG. 6 shows a configuration example of the quadrature modulator 300 in one embodiment of the present invention. The quadrature modulator 300 shown in FIG. 6 has an entire carrier signal input terminal 1 and a first carrier signal input terminal 101 connected to each other, and has an entire phase between the entire carrier signal input terminal 1 and the second carrier signal input terminal 201. The converter 20 is connected, and the other configuration is the same as the above-described configuration example.
With this configuration, for example, the second sub-orthogonal modulator, the overall phase converter 20, the phase inverter, and the output adder 30 are provided in parallel with the first sub-orthogonal modulator 100 used as a conventional quadrature modulator. With the addition, the conventional quadrature modulator can be easily changed to the quadrature modulator 300 having the same effect as the quadrature modulator 300 having the above configuration example.

次に、本発明の別の実施例における、直交変換器３００の構成例を示す。
本実施例では、全体搬送波信号を受信し第一搬送波と第二搬送波を出力する全体位相変換器２０が、第一搬送波と第二搬送波との位相を９０度以上１８０度以下の範囲で任意の位相差で出力する可変移相器２１である点が異なる。
本構成により、例えば直交変調器の周囲の構成要素や環境の変化に応じた位相調整が可能となる。 Next, a configuration example of the orthogonal transformer 300 according to another embodiment of the present invention will be described.
In the present embodiment, the entire phase converter 20, which receives the entire carrier signal and outputs the first carrier and the second carrier, sets the phase of the first carrier and the second carrier in any range from 90 degrees to 180 degrees. The difference is that the variable phase shifter 21 outputs a phase difference.
With this configuration, for example, phase adjustment can be performed in accordance with changes in components around the quadrature modulator and the environment.

図８は本発明の別の実施例における、直交変調器３００の構成例を示す。
本実施例において、直交変調器３００は、全体位相変換器２０に接続された位相調整部４００を備える。
位相調整部４００は、ノイズ信号受信部４１０、位相調整信号生成部４２０を有する。
ノイズ信号受信部４１０は、キャリアリークに対応したキャリアリーク信号を受信するキャリアリーク信号受信端４１１を有する。また、ノイズ信号受信部４１０は、イメージリークに対応したイメージリーク信号を受信するイメージリーク信号受信端４１２を有する。 FIG. 8 shows a configuration example of a quadrature modulator 300 according to another embodiment of the present invention.
In the present embodiment, the quadrature modulator 300 includes a phase adjuster 400 connected to the entire phase converter 20.
The phase adjustment section 400 includes a noise signal reception section 410 and a phase adjustment signal generation section 420.
The noise signal receiving section 410 has a carrier leak signal receiving end 411 that receives a carrier leak signal corresponding to the carrier leak. Further, the noise signal receiving section 410 has an image leak signal receiving end 412 for receiving an image leak signal corresponding to the image leak.

位相調整信号生成部４２０は、受信したキャリアリーク信号、および、イメージリーク信号に応じた位相調整信号を生成し、全体位相変換器２０に出力する。
そして、全体位相変換器２０は位相調整部４００に接続され、受信した位相調整信号に応じて位相を変更する。
本構成により、例えば直交変調器の稼働中にも、キャリアリーク、イメージリークに対応した位相調整が可能となる。 The phase adjustment signal generation section 420 generates a phase adjustment signal corresponding to the received carrier leak signal and image leak signal, and outputs the generated signal to the overall phase converter 20.
Then, the entire phase converter 20 is connected to the phase adjustment unit 400, and changes the phase according to the received phase adjustment signal.
According to this configuration, for example, even during operation of the quadrature modulator, phase adjustment corresponding to carrier leak and image leak can be performed.

図９は本発明の別の実施例における、直交変調器３００の構成例を示す。
本実施例において、直交変調器３００の有する位相調整部４００は、データテーブル記憶部４２１を有する。
データテーブル記憶部４２１は、データテーブルを記憶、保存する。
位相調整信号生成部４２０は、第一搬送波と第二搬送の位相差について、２以上の位相差におけるキャリアリーク信号およびイメージリーク信号を受信し、データテーブルを参照して位相調整信号を生成する。
本構成による直交変調器３００では、キャリアリーク量およびイメージリーク量がほぼ同様の特性を持つことが多いため、本構成におけるようにデータテーブルを参照して位相調整信号を生成することが極めて有効となる。 FIG. 9 shows a configuration example of a quadrature modulator 300 according to another embodiment of the present invention.
In the present embodiment, the phase adjustment unit 400 included in the quadrature modulator 300 includes a data table storage unit 421.
The data table storage unit 421 stores and stores a data table.
The phase adjustment signal generation section 420 receives a carrier leak signal and an image leak signal at a phase difference of two or more for the phase difference between the first carrier and the second carrier, and generates a phase adjustment signal by referring to the data table.
In the quadrature modulator 300 according to the present configuration, since the amount of carrier leak and the amount of image leak often have almost the same characteristics, it is extremely effective to generate the phase adjustment signal by referring to the data table as in the present configuration. Become.

図１０は本発明の別の実施例における、直交変調器３００の構成例を示し、図１１は第一搬送波と第二搬送波の位相差Δθ（度）とリーク量の関係を示す。図１１においてLCはキャリアリーク量、LIはイメージリーク量を示す。
本実施例において、直交変調器３００の有する位相調整部４００は、位相増減部４２２を備える。
位相増減部４２２は、通信前や通信中に位相差を増大または減少させる。
そして、位相調整部４００は、位相増減部４２２が位相差を増大させた後にノイズ信号が減少したときは位相差を増大させ、位相増減部４２２が位相差を減少させた後にノイズ信号が減少したときは位相差を減少させる、フィードバックを行う。
本構成による直交変調器３００では、図１１に示されるように、第一搬送波と第二搬送波の位相差について、９０度から１８０度の間で、９０度から位相差が増加するとキャリアリークLCが減少し、１８０度から位相差が減少するとイメージリークLIが減少するため、本構成による簡潔なフィードバックも有効に働く。 FIG. 10 shows a configuration example of a quadrature modulator 300 according to another embodiment of the present invention, and FIG. 11 shows a relationship between a phase difference Δθ (degree) between a first carrier and a second carrier and a leak amount. In FIG. 11, LC indicates the amount of carrier leak, and LI indicates the amount of image leak.
In this embodiment, the phase adjuster 400 included in the quadrature modulator 300 includes a phase adjuster 422.
The phase increasing / decreasing unit 422 increases or decreases the phase difference before or during communication.
Then, when the noise signal decreases after the phase increasing / decreasing unit 422 increases the phase difference, the phase adjusting unit 400 increases the phase difference, and the noise signal decreases after the phase increasing / decreasing unit 422 reduces the phase difference. At times, feedback is performed to reduce the phase difference.
In the quadrature modulator 300 according to the present configuration, as shown in FIG. 11, when the phase difference between the first carrier and the second carrier increases from 90 degrees to 180 degrees, the carrier leak LC increases. Since the image leak LI decreases when the phase difference decreases from 180 degrees and the phase difference decreases from 180 degrees, the simple feedback by this configuration also works effectively.

図１２は、本発明における直交変調器３００を備えた通信器５００を示す。
通信器５００は、第一通信回路部５１０、第二通信回路部５２０、アンテナ５３０、および、直交変調器３００を有する。
ノイズ信号受信機は、通信開始前または通信中にキャリアリーク信号またはイメージリーク信号を受信し、
位相調整信号生成部４２０は、受信したキャリアリーク信号、および、イメージリーク信号に応じた位相調整信号を生成して全体位相変換器２０に出力し、
全体位相変換器２０は位相調整部４００に接続され、受信した位相調整信号に応じて位相を変更する。
本構成による直交変調器３００はフィードバックなく、あるいは、短時間に誤差を抑制できるため、通信前の短時間に、あるいは、通信中のわずかな時間で誤差を抑制できるため、通信器５００本来の性能に大きな影響を与えることがない。 FIG. 12 shows a communication device 500 including the quadrature modulator 300 according to the present invention.
The communication device 500 includes a first communication circuit unit 510, a second communication circuit unit 520, an antenna 530, and the quadrature modulator 300.
The noise signal receiver receives a carrier leak signal or an image leak signal before or during communication, and
The phase adjustment signal generation section 420 generates the received carrier leak signal and the phase adjustment signal corresponding to the image leak signal, and outputs the generated signal to the overall phase converter 20.
The whole phase converter 20 is connected to the phase adjustment unit 400, and changes the phase according to the received phase adjustment signal.
Since the quadrature modulator 300 according to the present configuration can suppress the error without feedback or in a short time, the error can be suppressed in a short time before communication or in a short time during communication. Does not have a significant effect.

本発明は以上の実施例に限定されることなく、本発明の趣旨を逸脱しない範囲で様々な実施例を含むことは言うまでもない。
例えば、第一通信回路部と第二通信回路部は一体に形成されていてもよい。
また、全体位相変換器２０は、第一搬送波と第二搬送波の位相が９０度以上１８０度以下異なるものを出力するものであれば、全体搬送波信号入力端１と第一搬送波信号入力端１０１とが接続され、全体搬送波信号入力端１と第二搬送波信号入力端２０１との間に全体位相変換器２０が接続される構成としてもよく、あるいは、全体搬送波信号入力端１と第二搬送波信号入力端２０１とが接続され、全体搬送波信号入力端１と第一搬送波信号入力端１０１との間に全体位相変換器２０が接続される構成としてもよく、あるいは、全体位相変換器２０は、全体搬送波信号入力端１、第一搬送波信号入力端１０１、第二搬送波信号入力端２０１に接続される構成としてもよい。
It goes without saying that the present invention is not limited to the above embodiments, but includes various embodiments without departing from the spirit of the present invention.
For example, the first communication circuit unit and the second communication circuit unit may be formed integrally.
In addition, if the entire phase converter 20 outputs a phase difference between the first carrier and the second carrier of 90 degrees or more and 180 degrees or less, the entire carrier signal input terminal 1 and the first carrier signal input terminal 101 are connected to each other. May be connected, and the whole phase converter 20 may be connected between the whole carrier signal input terminal 1 and the second carrier signal input terminal 201. Alternatively, the whole carrier signal input terminal 1 and the second carrier signal input terminal may be connected. The terminal 201 is connected to the entire carrier signal input terminal 1 and the first carrier signal input terminal 101, and the entire phase converter 20 may be connected. It may be configured to be connected to the signal input terminal 1, the first carrier signal input terminal 101, and the second carrier signal input terminal 201.

１全体搬送波信号入力端
２全体I入力端
３全体Q入力端
４全体出力端
１０入力位相反転器
２０全体位相変換器
２１可変移相器
３０出力加算器

１００第一副直交変調器
１０１第一搬送波信号入力端
１０２第一I入力端
１０３第一Q入力端
１０４第一副出力端
１１０第一ベースバンド部
１２０第一I成分乗算器
１３０第一Q成分乗算器
１４０第一加算器

２００第二副直交変調器
２０１第二搬送波信号入力端
２０２第二I入力端
２０３第二Q入力端
２０４第二副出力端
２１０第二ベースバンド部
２２０第二I成分乗算器
２３０第二Q成分乗算器
２４０第二加算器

３００直交変調器

４００位相調整部
４１０ノイズ信号受信部
４１１キャリアリーク信号受信端
４１２イメージリーク信号受信端
４２０位相調整信号生成部
４２１データテーブル記憶部
４２２位相増減部

５００通信器
５１０第一通信回路部
５２０第二通信回路部
５３０アンテナ
DESCRIPTION OF SYMBOLS 1 Whole carrier signal input terminal 2 Whole I input terminal 3 Whole Q input terminal 4 Whole output terminal 10 Input phase inverter 20 Whole phase converter 21 Variable phase shifter 30 Output adder

Reference Signs List 100 first sub quadrature modulator 101 first carrier signal input terminal 102 first I input terminal 103 first Q input terminal 104 first sub output terminal 110 first baseband unit 120 first I component multiplier 130 first Q component Multiplier 140 First adder

200 second sub-quadrature modulator 201 second carrier signal input end 202 second I input end 203 second Q input end 204 second auxiliary output end 210 second baseband section 220 second I component multiplier 230 second Q component Multiplier 240 Second adder

300 quadrature modulator

400 phase adjuster 410 noise signal receiver 411 carrier leak signal receiver 412 image leak signal receiver 420 phase adjustment signal generator 421 data table storage 422 phase adjuster

500 communication device 510 first communication circuit unit 520 second communication circuit unit 530 antenna

Claims

The whole carrier signal input terminal, the whole I input terminal, the whole Q input terminal, the input phase inverter, the whole output terminal, the first sub quadrature modulator, the second sub quadrature modulator, the whole phase converter, and the output adder Prepared,
The first sub-quadrature modulator,
A first carrier signal input terminal, a first I input terminal, a first Q input terminal,
A first baseband unit that receives a first carrier from the first carrier signal input terminal and outputs a first in-phase signal in phase with the first carrier, and a first quadrature signal orthogonal to the first carrier,
A first I component multiplier for multiplying a first I input signal input from the first I input terminal by the first in-phase signal;
A first Q component multiplier for multiplying the first quadrature signal by a first Q input signal input from the first Q input terminal;
A first adder for adding an output of the first I component multiplier and an output of the first Q component multiplier,
The second sub-quadrature modulator,
A second carrier signal input end, a second I input end, a second Q input end,
A second baseband unit that receives a second carrier from the second carrier signal input terminal and outputs a second in-phase signal in phase with the second carrier, and a second quadrature signal orthogonal to the second carrier.
A second I component multiplier for multiplying a second I input signal input from the second I input terminal by the second in-phase signal;
A second Q component multiplier for multiplying a second Q input signal input from the second Q input terminal by the second quadrature signal;
A second adder for adding the output of the second I component multiplier and the output of the second Q component multiplier,
The first sub-quadrature modulator and the second sub-quadrature modulator have substantially the same characteristics,
The overall I input terminal is connected to the first I input terminal and the second Q input terminal,
The overall Q input terminal is connected to the first Q input terminal, and connected to the second I input terminal via the input phase inverter,
The whole phase converter includes:
The entire carrier signal input terminal, the first carrier signal input terminal, connected to the second carrier signal input terminal,
Receiving the whole carrier inputted from the whole carrier signal input end , outputting the received whole carrier as the first carrier to the first carrier signal input end, and outputting the received whole carrier to the first a carrier having different carrier and 90 degrees to 180 degrees or less phase, as the second carrier wave, and outputs the second carrier signal input terminal,
The output adder is connected to the overall output terminal, and adds the outputs of the first adder and the second adder;
A quadrature modulator, characterized in that:

The whole carrier signal input terminal and the first carrier signal input terminal are connected, and the whole phase converter is connected between the whole carrier signal input terminal and the second carrier signal input terminal. 2. The quadrature modulator according to 1.

The overall phase converter, which receives the entire carrier and outputs the first carrier and the second carrier, adjusts the phase of the first carrier and the second carrier to any position within a range of 90 degrees or more and 180 degrees or less. The quadrature modulator according to claim 1, wherein the quadrature modulator is a variable phase shifter that outputs a phase difference.

A phase adjuster connected to the overall phase converter, wherein the phase adjuster includes:
A noise signal receiving unit having a carrier leak signal receiving end for receiving a carrier leak signal corresponding to the carrier leak, and having an image leak signal receiving end for receiving an image leak signal corresponding to the image leak;
The received carrier leak signal, and a phase adjustment signal generating unit that generates a phase adjustment signal according to the image leak signal and outputs the generated signal to the overall phase converter,
The quadrature modulator according to claim 3, wherein the whole phase converter is connected to the phase adjustment unit, and changes a phase according to the received phase adjustment signal.

The phase adjustment unit,
A data table storage unit for storing the data table,
The phase adjustment signal generator receives the carrier leak signal and the image leak signal at a phase difference of 2 or more with respect to a phase difference between the first carrier and the second carrier, and refers to the data table to determine the phase. The quadrature modulator according to claim 4, wherein the quadrature modulator generates an adjustment signal.

The phase adjustment unit,
A phase increasing / decreasing unit that increases or decreases the phase difference during communication,
When the noise signal decreases after the phase increasing / decreasing unit increases the phase difference, the phase difference is increased, and when the noise signal decreases after the phase increasing / decreasing unit reduces the phase difference, the phase difference decreases. The quadrature modulator according to claim 4, wherein:

A communication device comprising the quadrature modulator according to any one of claims 4 to 6,
The noise signal receiving unit receives the carrier leak signal or the image leak signal before or during communication start,
The phase adjustment signal generator, the received carrier leak signal, and generates the phase adjustment signal according to the image leak signal, and outputs the phase adjustment signal to the entire phase converter,
The communication device, wherein the whole phase converter is connected to the phase adjustment unit, and changes a phase according to the received phase adjustment signal.