HTML5 Webook

123/182

1IntroductionNHK has been working to realize the transmission of 4K/8K Super High Vision [1] high capacity signals to in-dividual households via satellite and establish a broadcast service. 8K video signals have a pixel count of 7,680 × 4,320, making them 16 times more detailed than the cur-rent 2K service. 8K information bit rate extends to a non-compressed maximum of 144 Gbps, and when using the latest high-eciency video coding (HEVC) [2], the trans-mission bit rate is assumed to be approximately 80–100 Mbps.Satellite broadcast frequencies are set to the interna-tionally decided bandwidths of 12 GHz (11.7–12.75 GHz) and 21 GHz (21.4–22.0 GHz). Currently, with the ISDB-S, 12 GHz satellite broadcasting uses right-hand circular polarization (RHCP) to secure 52 Mbps transmission ca-pacity for the occupied bandwidth of each channel (34.5 MHz). Additionally, the use of le-hand circular polarization (LHCP) has also become possible, and ap-proximately 100 Mbps transmission capacity can be secured for each channel with the ISDB-S3 [3]–[5], allowing for 4K/8K transmissions. Further, with 21 GHz bandwidth satellite transmissions, it is expected that we will see a 600 MHz [6] bandwidth split into two 300 MHz-class wideband transmissions, and work is progressing on the use of this as a high-capacity transmission channel of multiple 8K broadcastings, etc [7]–[9].NHK is carrying out various types of transmission experiments directed toward R&D for 4K/8K transmissions on 12 GHz and 21 GHz bands, and has been utilizing the WINDS satellite as a transmission channel for a simulated broadcasting satellite.In this paper, we report the results of using the WINDS satellite for: (1) functional verication of the ISDB-S3 premised on 12 GHz band satellite broadcasting [10], and (2) performance verication of a broadband modem pre-mised on 21 GHz band satellite broadcasting.2Transmission experiments premised on 12 GHz satellite broadcasting2.1ISDB-S3e main transmission parameters of the (ISDB-S3) for 12 GHz band satellite broadcast are shown in Table 1. e transmission capacity of 8K broadcasting is assumed at approximately 80–100 Mbps by HEVC compression tech-nology. ISDB-S3 adopts a roll-o factor of 0.03 and a symbol rate of 33.7561 Mbaud. Compared with the current TabT1　Main transmission parameters for ISDB-S3Modulation schemeπ/2 shift BPSK, QPSK, 8-PSK, 16-APSK, 32-APSKSymbol rate33.7561 MbaudRoll-off factor0.03Information bit rate16 APSK (7/9): 99.95 MbpsError-correcting codeLDPC (internal code) + BCH (external code)LDPC (inner code) code rate1/3, 2/5, 1/2, 3/5, 2/3, 3/4, 7/9, 4/5, 5/6, 7/8, 9/10Transmission control signalTMCC3-6 SHV Transmission ExperimentsMasaaki KOJIMA, Yoichi SUZUKI, Yuki KAWAMURA, Susumu NAKAZAWA, Shuichi AOKI, Masafumi NAGASAKA, Yoshifumi MATSUSAKI, Yuki KOIZUMI, Masashi KAMEI, Kazuhiro OTSUKI, Hisashi SUJIKAI, Akinori HASHIMOTO, Kenichi TSUCHIDA, Kyoichi SAITO, Naoyoshi NAKAMURA, Shoji TANAKA, Tomohiro SAITO, Takeshi KIMURA, and Kazuyoshi SHOGENNHK has been studying “4K/8K Super Hi-Vision (ultra high definition) TV” as next generation TV system and aimed to achieve the 4K/8K broadcasting services for satellite. In this paper, we report experimental results of the demonstrations and performance evaluations for 8K multi-channels and functional verifications for transmission systems.1193 Ultra-High-Speed Satellite Communication Technology