Personal and Mobile Satellite DMB Services in Korea

SUMMARYFuture mobile networks are expected to involve systems that are based on different technologies, such as WiFi, WiMAX, 2G/3G/3G1, LTE, and satellite. To address this scenario, ITU has defined integrated and hybrid networks in the framework of Next-Generation Networks. The interest is to exploit the cooperation of different wireless communication systems (segments) to provide service to mobile users in the most efficient way, taking into account signal quality (coverage), traffic congestion conditions, and cost issues. Integrated and hybrid networks have the potential to be an efficient and cost-effective solution to employ satellite communications for mobile users. In the view of this, our paper focuses on the design of integrated/hybrid systems taking into account physical, MAC, and network layers issues. System examples and standards are described as well. Then, cooperative diversity techniques and traffic engineering issues for overflow traffic are discussed. This paper concludes identifying some possible future trends.

Section: System Examplesmentioning

confidence: 99%

Satellite component of NGN: Integrated and hybrid networks

Kota

Giambene

Kim

2011

“…The CDM modulator uses a convolution channel encoder to overcome transmission errors, block interleaver to overcome the shadowing and blocking situation in the satellite transmission. This signal is transmitted by spreading with the Walsh code and PN code [3].…”

Section: S-dmb System Overviewmentioning

confidence: 99%

An overview of S‐DMB system and the testbed for satellite–mobile convergence services

Chung¹,

Yu²

2011

SUMMARYThis paper presents the system and architecture of Satellite-Digital Multimedia Broadcasting (S-DMB) in Korea. TU Media Corp., the S-DMB service company, now delivers 21 video channels, 16 audio channels including premium channels to subscribers in Korea. This service provides a high quality of reception with full coverage for the Korean peninsular at travelling speeds of over 300 km/h. A testbed system has been developed to prove the viability of the satellite-mobile convergence services. In this paper, the S-DMB system and testbed system are described.

“…This approach was already implemented in a currently deployed commercial S-DMB system [2]. In this system, two versions of signal format, i.e.…”

Section: System Modelmentioning

confidence: 99%

“…For this reason, the link from the satellite to the repeaters should be designed much more securely, generally with higher link margins, than the link from the satellite to the user terminal. For example, in a currently deployed commercial S-DMB system [2], quasi-error-free condition is maintained in the link from the satellite to the terrestrial gap fillers. This is achieved by using much higher link margin compared with the direct link to the user terminal, as well as using a different frequency band, i.e.…”

Section: Cooperative Transmit Diversitymentioning

confidence: 99%

See 1 more Smart Citation

A cooperative transmit diversity scheme for mobile satellite broadcasting systems

Ahn

Kim

et al. 2010

SUMMARYIn this study, we propose an efficient cooperative diversity scheme for mobile satellite multimedia broadcasting systems. The proposed scheme is a transmit diversity technique for adapting different channel environments, and thus, no channel quality information from the return link is needed. In the proposed scheme, we utilize space-time block codes and rate-compatible turbo codes to achieve diversity gains and additional coding gains, respectively. The satellite and several repeaters on the ground cooperate to send the encoded signals, enabling the user terminal to realize diversity gain. The simulation results demonstrate that the proposed scheme can provide greatly improved performance. The simulation results in this study show that we can achieve about a 0.8 and 2.3 dB power gain by using the proposed cooperative diversity scheme without and with maximal ratio combining schemes, respectively, compared with the conventional scheme even, with a higher code rate.