CCIS 263 - Performance Evaluation of DAB, DAB+ and ... - Springer Link
Performance Evaluation of DAB, DAB+ and T-DMB Audio: Field Trial Myung-Sun Baek, Yonghoon Lee, Sora Park, Geon Kim, Bo-mi Lim, Yun-Jeong Song, and Yong-Tae Lee Electronics and Telecommunications Research Institute (ETRI), Daejeon, Korea {sabman,Lee.Y.H,parksora,kimgeon,blim_vrossi46,yjsong, ytlee}@etri.re.kr
Abstract. This paper presents the field trial results of digital audio broadcasting (DAB), DAB+ and terrestrial-digital multimedia broadcasting (TDMB) audio systems to provide useful information about each digital radio broadcasting standard. Although the all methods are representative digital radio broadcasting standards based on Eureka-147, they have different parts from each other. This field trial results describe a reception performance of each method in various practical reception environments. To evaluate reception performance, various measurement routes are considered. These test results are able to give basic information for the choice of digital radio standard in many countries. Keywords: DAB, DAB+, T-DMB audio and field trial.
1
Introduction
Since digital radio broadcasting techniques can give highly enhanced performance and quality (e.g. CD like audio quality, single frequency network, slide show, etc), many countries pay attention to converting their analog radio broadcasting services into digital services. However, to choice most proper digital radio standard is very knotty problem for each country. To evaluate the performance of digital radio broadcasting technologies in practical reception environment of Korea, field trials were performed in 2010. This paper deals with the field trial results of digital audio broadcasting (DAB), DAB+ and terrestrial digital multimedia broadcasting (T-DMB) technologies. Since DAB, DAB+ and TDMB audio technologies are the representative digital radio standards operating in band III, and are based on Eureka-147 standard [1], most parts are very similar. However, to develop the performance of the system, they have some different parts [2], [3]. Because of the different parts, performance differences are observed. The objective of the field trials is to measure and analyze the reception performance and service coverage in various practical reception environments. The T.-h. Kim et al. (Eds.): MulGraB 2011, Part II, CCIS 263, pp. 146–152, 2011. © Springer-Verlag Berlin Heidelberg 2011
Performance Evaluation of DAB, DAB+ and T-DMB Audio
147
rest of the paper is organized as follows. Section II describes the test bed (transmitter and test vehicle). Field trial parameters and routes are addressed in section III. Field trial results are presented in section IV. And finally, concluding remarks is given in section V. Table 1. Transmitter characteristics for field trials
Parameter
Value
Location
37°42’29.81”N, 129°00’0.62”E
Altitude
325 meters
Tower height
40 meters
Modulation
DAB, DAB+, T-DMB audio
Frequency
195.008MHz (CH. 10B)
Transmit Power
100W
Fig. 1. Receiver vehicle for field test
2
Test Bed for Field Trial
For the field trial, test bed has been built in Gangwon-do, Korea. This transmitter is located at the Gangwon Television Broadcasting (GTB) tower in Mt. Gwebang of Gangneung-City, Gangwon-do, Korea. Table 1 shows the transmitter feature of the
148
M.-S. Baek et al.
trial. As Table 1, the DAB, DAB+ and T-DMB audio signals are transmitted through band III CH. 10B with 100W. In this test, the DAB, DAB+ and T-DMB audio signals are multiplexed in one ensemble and transmitted simultaneously. Furthermore, in this test, test vehicle is designed to evaluate the mobile reception performance as Fig. 1. The test van can receive multiplexed ensemble, and separate the ensemble into three digital radio signals.
3
Field Test Parameters and Routes
3.1
Test Parameters
The objective of our digital radio field trials is to measure the performance and to analyze the robustness and coverage of each method. To measure audibility, the main service channel (MSC) character error rate (CER) is adopted. CER means the corrected bit rate after Viterbi decoding. Snce the decoder has specific error correction capability, higher error value might induce miss operation of decoder or imperfect error correction. Therefore, high CER results in signal distortion, which causes packet loss. Through the laboratory test, the threshold values are determined for each system as follows: • DAB : CER = 0.06 • DAB+ : CER = 0.084 • T-DMB Audio : CER = 0.09.
Fig. 2. Location and distance from transmitter of each route
Performance Evaluation of DAB, DAB+ and T-DMB Audio
3.2
149
Test Routes
The field trials were performed in Gangneung-City, Gangwon-do. Fig. 2 and Fig. 3 describe the measurement routes. The field test is executed according to the reception environments and distance. Gangneung city urban/rural routes and Jumunjin city urban/rural routes are considered in this test. Fig. 2 describes the location and distance from transmitter of each route. As Fig. 2, the Gangneung city is nearer from the transmit site than Jumunjin city. The distances of Gangneung city and Jumunjin city from transmit site are 10km and 25km, respectively. And among the environment measurement routes, the urban routes have many buildings and stores, while rural routes have many paddy fields and dry fields and a few houses. The features of the test routes are illustrated in Fig. 3.
(a) Gangneung city
(b) Jumunjin city Fig. 3. Field trial routes
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Field Trial Results
Received field strength of environment test routes are showed in Fig. 4 and Fig. 5. Since the distance between transmit site and Gangneung city is shorter than that of Jumunjin, the field strength of Gangneung city is higher. In the case of play success rate of Gangneung city (Fig. 6), since both urban and rural routes are high field strength area, urban and rural routes have high play success rates. In the case of Jumunjin city (Fig. 7), since the urban route has line-of-sight, its play success rate is very high and similar to the performance of Gangneung city. However, because the rural route of Jumunjin city has a high mountain in the centre of the route, the received field strength of behind the mountain is very low, and the play success rate is worse than that of other routes.
(a) urban
(b) rural Fig. 4. Received field strength of Gangneung city
Performance Evaluation of DAB, DAB+ and T-DMB Audio
(a) urban
(b) rural Fig. 5. Received field strength of Jumunjin city
Fig. 6. Play success rate of Gangneung city routes
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Fig. 7. Play success rate of Jumunjin city routes
5
The References Section
The objective of our digital radio field trials is to measure the performance and to analyze the robustness and coverage of each method in Korean field environment. Since the various reception environments are considered, these test results are able to give basic information for the decision of digital radio standard in many countries, and our tests lead to the development of performance evaluation method of each digital radio technologies in field test environment. Acknowledgments. This research was supported by the KCC(Korea Communications Commission), Korea, under the R&D program supervised by the KCA(Korea Communications Agency)"(KCA-2011-11912-02002).
References 1. ETSI EN 300 401, Radio broadcasting systems: digital audio broadcasting (DAB) to mobile, portable and fixed receivers, ETSI, Tech. Rep. (February 1995) 2. ETSI TS 102 427 V1.1.1, Digital audio broadcasting (DAB); Data broadcasting - MPEG-2 TS streaming, ETSI (July 2005) 3. ETSI TS 102 563 V1.1.1, Digital audio broadcasting (DAB); Transport of advanced audio coding audio, ETSI (February 2007) 4. iBiquity Digital, HD RadioTM air interface design description series, (August 2007) 5. ETSI ES 201 980 V2.2.1, Digital radio mondiale (DRM) system specification, ETSI (August 2009) 6. Lee, Y.-T., Park, S., Baek, M.-S., Lee, Y.-H., Lim, B.-M., Song, Y.-J.: Field trials of digital radio technologies: DAB, DAB+, T-DMB audio, HD Radio and DRM+. In: Proceeding of NAB BEC 2011, pp. 255–262 (April 2011)
Abstract. This paper presents the field trial results of digital audio broadcasting (DAB), DAB+ and terrestrial-digital multimedia broadcasting (TDMB) audio systems to provide useful information about each digital radio broadcasting standard. Although the all methods are representative digital radio broadcasting standards based on Eureka-147, they have different parts from each other. This field trial results describe a reception performance of each method in various practical reception environments. To evaluate reception performance, various measurement routes are considered. These test results are able to give basic information for the choice of digital radio standard in many countries. Keywords: DAB, DAB+, T-DMB audio and field trial.
1
Introduction
Since digital radio broadcasting techniques can give highly enhanced performance and quality (e.g. CD like audio quality, single frequency network, slide show, etc), many countries pay attention to converting their analog radio broadcasting services into digital services. However, to choice most proper digital radio standard is very knotty problem for each country. To evaluate the performance of digital radio broadcasting technologies in practical reception environment of Korea, field trials were performed in 2010. This paper deals with the field trial results of digital audio broadcasting (DAB), DAB+ and terrestrial digital multimedia broadcasting (T-DMB) technologies. Since DAB, DAB+ and TDMB audio technologies are the representative digital radio standards operating in band III, and are based on Eureka-147 standard [1], most parts are very similar. However, to develop the performance of the system, they have some different parts [2], [3]. Because of the different parts, performance differences are observed. The objective of the field trials is to measure and analyze the reception performance and service coverage in various practical reception environments. The T.-h. Kim et al. (Eds.): MulGraB 2011, Part II, CCIS 263, pp. 146–152, 2011. © Springer-Verlag Berlin Heidelberg 2011
Performance Evaluation of DAB, DAB+ and T-DMB Audio
147
rest of the paper is organized as follows. Section II describes the test bed (transmitter and test vehicle). Field trial parameters and routes are addressed in section III. Field trial results are presented in section IV. And finally, concluding remarks is given in section V. Table 1. Transmitter characteristics for field trials
Parameter
Value
Location
37°42’29.81”N, 129°00’0.62”E
Altitude
325 meters
Tower height
40 meters
Modulation
DAB, DAB+, T-DMB audio
Frequency
195.008MHz (CH. 10B)
Transmit Power
100W
Fig. 1. Receiver vehicle for field test
2
Test Bed for Field Trial
For the field trial, test bed has been built in Gangwon-do, Korea. This transmitter is located at the Gangwon Television Broadcasting (GTB) tower in Mt. Gwebang of Gangneung-City, Gangwon-do, Korea. Table 1 shows the transmitter feature of the
148
M.-S. Baek et al.
trial. As Table 1, the DAB, DAB+ and T-DMB audio signals are transmitted through band III CH. 10B with 100W. In this test, the DAB, DAB+ and T-DMB audio signals are multiplexed in one ensemble and transmitted simultaneously. Furthermore, in this test, test vehicle is designed to evaluate the mobile reception performance as Fig. 1. The test van can receive multiplexed ensemble, and separate the ensemble into three digital radio signals.
3
Field Test Parameters and Routes
3.1
Test Parameters
The objective of our digital radio field trials is to measure the performance and to analyze the robustness and coverage of each method. To measure audibility, the main service channel (MSC) character error rate (CER) is adopted. CER means the corrected bit rate after Viterbi decoding. Snce the decoder has specific error correction capability, higher error value might induce miss operation of decoder or imperfect error correction. Therefore, high CER results in signal distortion, which causes packet loss. Through the laboratory test, the threshold values are determined for each system as follows: • DAB : CER = 0.06 • DAB+ : CER = 0.084 • T-DMB Audio : CER = 0.09.
Fig. 2. Location and distance from transmitter of each route
Performance Evaluation of DAB, DAB+ and T-DMB Audio
3.2
149
Test Routes
The field trials were performed in Gangneung-City, Gangwon-do. Fig. 2 and Fig. 3 describe the measurement routes. The field test is executed according to the reception environments and distance. Gangneung city urban/rural routes and Jumunjin city urban/rural routes are considered in this test. Fig. 2 describes the location and distance from transmitter of each route. As Fig. 2, the Gangneung city is nearer from the transmit site than Jumunjin city. The distances of Gangneung city and Jumunjin city from transmit site are 10km and 25km, respectively. And among the environment measurement routes, the urban routes have many buildings and stores, while rural routes have many paddy fields and dry fields and a few houses. The features of the test routes are illustrated in Fig. 3.
(a) Gangneung city
(b) Jumunjin city Fig. 3. Field trial routes
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4
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Field Trial Results
Received field strength of environment test routes are showed in Fig. 4 and Fig. 5. Since the distance between transmit site and Gangneung city is shorter than that of Jumunjin, the field strength of Gangneung city is higher. In the case of play success rate of Gangneung city (Fig. 6), since both urban and rural routes are high field strength area, urban and rural routes have high play success rates. In the case of Jumunjin city (Fig. 7), since the urban route has line-of-sight, its play success rate is very high and similar to the performance of Gangneung city. However, because the rural route of Jumunjin city has a high mountain in the centre of the route, the received field strength of behind the mountain is very low, and the play success rate is worse than that of other routes.
(a) urban
(b) rural Fig. 4. Received field strength of Gangneung city
Performance Evaluation of DAB, DAB+ and T-DMB Audio
(a) urban
(b) rural Fig. 5. Received field strength of Jumunjin city
Fig. 6. Play success rate of Gangneung city routes
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Fig. 7. Play success rate of Jumunjin city routes
5
The References Section
The objective of our digital radio field trials is to measure the performance and to analyze the robustness and coverage of each method in Korean field environment. Since the various reception environments are considered, these test results are able to give basic information for the decision of digital radio standard in many countries, and our tests lead to the development of performance evaluation method of each digital radio technologies in field test environment. Acknowledgments. This research was supported by the KCC(Korea Communications Commission), Korea, under the R&D program supervised by the KCA(Korea Communications Agency)"(KCA-2011-11912-02002).
References 1. ETSI EN 300 401, Radio broadcasting systems: digital audio broadcasting (DAB) to mobile, portable and fixed receivers, ETSI, Tech. Rep. (February 1995) 2. ETSI TS 102 427 V1.1.1, Digital audio broadcasting (DAB); Data broadcasting - MPEG-2 TS streaming, ETSI (July 2005) 3. ETSI TS 102 563 V1.1.1, Digital audio broadcasting (DAB); Transport of advanced audio coding audio, ETSI (February 2007) 4. iBiquity Digital, HD RadioTM air interface design description series, (August 2007) 5. ETSI ES 201 980 V2.2.1, Digital radio mondiale (DRM) system specification, ETSI (August 2009) 6. Lee, Y.-T., Park, S., Baek, M.-S., Lee, Y.-H., Lim, B.-M., Song, Y.-J.: Field trials of digital radio technologies: DAB, DAB+, T-DMB audio, HD Radio and DRM+. In: Proceeding of NAB BEC 2011, pp. 255–262 (April 2011)
