Digital Multimedia Broadcasting Receiver Research Articles

Integrated mobile terrestrial digital multimedia broadcasting player compliant with the T-DMB, CMMB, and ISDB-T standards

In this paper, we designed an integrated mobile terrestrial Digital Multimedia Broadcasting (DMB) player. The newly designed DMB player provides audio and video displays in accordance with the T-DMB, CMMB, and ISDB-T standards. In order to support displaying audio and video stream data of these three different standards selectively, we developed a unified Transport Stream (TS) parser, implemented new DMB player applications that provide the necessary functionalities and menus. In the near future users of this new terrestrial DMB player will be able to receive mobile terrestrial DMB data as they travel in Korea, China and Japan without the need of a corrective DMB receiver device for each country.

GPS/DMB 수신용 단일 급전 이중 대역 원형 편파 사각 패치 안테나 설계 및 구현

In this paper, we propose a novel single-feed dual-band circular polarization square patch antenna for GPS(global positioning system)/DMB(digital multimedia broadcasting) receiver. The proposed antenna has folded slots at the 4 corners and a diagonal slot at the center of the square patch. The measured -10 dB impedance bandwidths of the proposed antenna were 84 MHz ranging from 1.516 GHz to 1.600 GHz for the low frequency band(GPS) and 109 MHz ranging from 2.596 GHz to 2.705 GHz for the high frequency band(DMB). The measured peak linear antenna gains of the proposed antenna were 6.23 dBi at 1.575 GHz for GPS and 6.97 dBi at 2.642 GHz for DMB band.

Power efficient Viterbi decoder based on pre-computation technique for portable digital multimedia broadcasting receiver

Digital multimedia broadcasting (DMB) is a reliable multi-service system for mobile and portable receivers. DMB system allows interference-free reception under the conditions of multipath propagation and transmission errors using coded orthogonal frequency division multiplexing modulation (COFDM) and unequal error protection (UEP) scheme. For error correction of portable DMB receivers, punctured convolutional code and viterbi decoder is developed but it needs lots of computations for real-time operation. So, it is desired to design a high speed and low-power hardware scheme for viterbi decoder. This paper proposes a combined add-compare-select (ACS) and path metric normalization (PMN) unit using pre-computation technique for DMB system. The proposed PMN unit reduces the critical path by applying fixed value selection algorithm using the comparison tree properties. We also propose an ACS structure using the decomposition and pre-computation technique for reducing the complexity of the adder, comparator and multiplexer. Simulation results shows that area, gate delay and power consumption are reduced about 3.78%, 23.80%, and 12.22%, respectively.

Design and Implementation of the Ensemble Remultiplexer for DMB Service Based on Eureka-147

A new transmission system is necessary for the Digital Multimedia Broadcasting (DMB) service in Korea. Therefore, in this paper, we propose a new architecture for the implementation of a DMB transmission system based on Eureka-147. We describe the design and implementation of the Ensemble remultiplexer, which is essential to the proposed system for remultiplexing ETI frames and MPEG-2 transport streams. The proposed system provides a solution with high flexibility and low cost for multimedia broadcasting service. The functions of this transmission system have been verified by using our DMB receiver and other related systems.

Portable receivers for digital multimedia broadcasting

A new national standard for digital multimedia broadcasting (DMB) has been announced in Korea to provide high quality digital audio, video, and data broadcasting services to fixed, mobile, and portable receivers. We have developed the world's first DSP/FPGA implementation of the portable DMB receiver, complete with an RF receiver, a 6.4-inch LCD display, and audio/video/data decoders. In this paper, we present the design, implementation, and performance of this portable DMB receiver. First, we provide a brief overview of the DMB system and the audio/video coding tools supported by it, i.e., MPEG-4 BSAC and MPEG-4 Part 10 AVC/H.264. We discuss the low-power high-performance design of the DMB receiver, focusing particularly on the audio/video decoding parts. Finally, we illustrate the performance of the portable DMB receiver that operates in real-time at the overall frequency of 25 MHz.