TRANSMISSION DEVICE AND RECEIVING DEVICE

• Main Authors: SHIMAZAKI TOMOHIRO, MATSUSAKI YOSHIFUMI, NAKAGAWA TAKAYUKI, YAMAGISHI FUMIYA, ISO NAOHIKO
• Format: Patent
• Language: English; Japanese
• Published: 08.06.2023
• Subjects: BASIC ELECTRONIC CIRCUITRY; CODE CONVERSION IN GENERAL; CODING; DECODING; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

To improve the transmission performance by using an optimal signal point allocation mapping rule according to a modulation scheme and an error correction code in an SC-FDE system.SOLUTION: An RS encoding portion 14 of a transmission device 1 performs encoding using a shortened RS (204, 188) code as an outer code. A convolutional coding unit 16 performs coding using a convolutional code with a predetermined coding rate as the inner code. A mapping portion 20 performs mapping on a signal sequence according to a preset mapping rule. For the signal point arrangement of the mapping rule, when the modulation method is 16APSK, the radius ratio R12 is set to 2.86, 3.15, 2.88, 2.93 according to the coding rate of the convolutional code 1/2, 2/3, 3/4, and 5/6. When the modulation method is 32APSK, the radius ratios R12 are set to 2.79, 3.16, 2.87 and 2.91, and the radius ratios R13 are set to 5.29, 5.79, 5.20, and 5.11.SELECTED DRAWING: Figure 10 【課題】ＳＣ－ＦＤＥ方式において、変調方式及び誤り訂正符号に応じた最適な信号点配置のマッピングルールを用いることで、伝送性能を改善する。【解決手段】送信装置１のＲＳ符号化部１４は、外符号として短縮化ＲＳ（204,188）符号を用いた符号化を行う。畳み込み符号化部１６は、内符号として所定の符号化率の畳み込み符号を用いた符号化を行う。マッピング部２０は、信号系列に対し、予め設定されたマッピングルールにてマッピングを行う。マッピングルールの信号点配置は、変調方式が１６ＡＰＳＫの場合、畳み込み符号の符号化率が１／２，２／３，３／４，５／６に応じて、それぞれ半径比Ｒ12を２．８６，３．１５，２．８８，２．９３とする。また、変調方式が３２ＡＰＳＫの場合、それぞれ半径比Ｒ12を２．７９，３．１６，２．８７，２．９１、半径比Ｒ13を５．２９，５．７９，５．２０，５．１１とする。【選択図】図１０