Digital outside-broadcasting-link using OFDM modulation scheme

Author

Moriyama, S. ; Tsuchida, K. ; Sasaki, M. ; Yamazaki, S.

Author_Institution

NHK Sci. & Tech. Res. Labs., Tokyo, Japan

Volume

42

Issue

3

fYear

1996

fDate

9/1/1996 12:00:00 AM

Firstpage

266

Lastpage

271

Abstract

A study on digital broadcasting systems has been conducted for the multimedia era. Regarding program production, a digital outside-broadcasting-link (OBL), in particular, from mobile source is required to gather digital video and audio sources in severe multipath environments. The orthogonal frequency division multiplexing (OFDM) modulation scheme is robust under multipath fading conditions. A digital OFDM modem for OBL in the 800 MHz band has been developed to enable stable transmission of digital sources from moving vehicles. In the experimental OFDM-OBL, the compressed digital video and audio data are distributed to 572 carriers in the 9 MHz bandwidth, using differential quadrature phase shift keying (DQPSK) modulation for each carrier. In computer simulation and indoor/outdoor experiments, it is confirmed that digital OFDM-OBL can stably transmit signals, even under severe multipath fading conditions, while pictures transmitted with conventional FM-OBL are seriously degraded. This paper describes the features of the OFDM modem for the digital OBL which transmits program sources from moving vehicles, and also discusses aspects of gathering digital program sources

Keywords

UHF radio propagation; audio coding; digital television; fading; frequency division multiplexing; modems; multimedia communication; multipath channels; quadrature phase shift keying; radio links; television broadcasting; video coding; 800 MHz; 9 MHz; DQPSK; OFDM modulation; bandwidth; compressed digital audio data; compressed digital video data; computer simulation; differential quadrature phase shift keying; digital OFDM modem; digital audio sources; digital broadcasting systems; digital outside broadcasting link; digital program sources; digital video sources; experimental OFDM-OBL; indoor/outdoor experiments; mobile source; moving vehicles; multimedia; multipath environments; multipath fading; orthogonal frequency division multiplexing; program production; Digital audio broadcasting; Digital multimedia broadcasting; Digital video broadcasting; Fading; Modems; Multimedia communication; Multimedia systems; OFDM modulation; Production; Vehicles;

fLanguage

English

Journal_Title

Broadcasting, IEEE Transactions on

Publisher

ieee

ISSN

0018-9316

Type

jour

DOI

10.1109/11.536590

Filename

536590