TRANSMISSION DEVICE AND PROGRAM

• Main Authors: AKIYAMA RYOTA, NAGASAKA MASAFUMI, YOKOZAWA SHINSUKE, KAMEI MASA, KOJIMA MASAAKI, KOIZUMI YUKI
• Format: Patent
• Language: English; Japanese
• Published: 06.02.2024
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

To realize a distortion compensating function while reducing a hardware scale.SOLUTION: A transmission device 100 according to the present invention comprises: a pseudo-transmitter 105 whose characteristics approximate to those of a transmitter in a transmission line; a mapping unit 102 that generates an IQ signal in which a digital signal is modulated; a QRRF unit 104 that carries out first waveform reshaping on the IQ signal by a fourth root roll-off filter; a vector computation unit 112 that generates a distortion compensation signal in which an inverse characteristic to the characteristic that the pseudo-transmitter 105 has is added to the IQ signal after first waveform reshaping, on the basis of the IQ signal after first waveform reshaping, and a signal from the IQ signal after first waveform reshaping having passed through the pseudo-transmitter 105; a QRRF unit 110 that carries out second waveform reshaping on the distortion compensation signal by the fourth root roll-off filter; and a D/A conversion-orthogonal modulation unit 111 that D/A converts the signal after second waveform reshaping and orthogonally modulates the signal after the D/A conversion to generate a modulated wave signal.SELECTED DRAWING: Figure 1 【課題】ハードウェア規模を低減しつつ、歪補償機能を実現する。【解決手段】本発明に係る送信装置１００は、伝送路上の伝送器の特性に近似した特性の疑似伝送器１０５と、デジタル信号を変調したＩＱ信号を生成するマッピング部１０２と、ＩＱ信号に対して、４乗根のルートロールオフフィルタにより第１の波形整形を行うＱＲＲＦ部１０４と、第１の波形整形後のＩＱ信号と、第１の波形整形後のＩＱ信号が疑似伝送器１０５を通過した信号とに基づき、第１の波形整形後のＩＱ信号に、疑似伝送器１０５が有する特性の逆特性を付加した歪補償信号を生成するベクトル演算部１１２と、歪補償信号に対して、４乗根のルートロールオフフィルタにより第２の波形整形を行うＱＲＲＦ部１１０と、第２の波形整形後の信号をＤ／Ａ変換し、Ｄ／Ａ変換後の信号を直交変調して変調波信号を生成するＤ／Ａ変換・直交変調部１１１と、を備える。【選択図】図１