Pub Date : 2009-10-08DOI: 10.1109/APCC.2009.5375508
N. Huang, Hong-Yi Chang, Tzu-Chien Wang, Yeh-Sheng Lin, Yuan-Wei Lin, Shyr-Yuan Cheng, Jun-Jyi Lin
This paper proposes a concept to construct a Traffic-Localized and Resource-Efficient tree-based architecture to support the delivery of an SVC-encoded live video streaming onto a Public-Shared Network. A Public-Shared Network consists of a large number of bandwidth sharable devices, such as sharable APs in a FON network. The SVC-encoded video streaming is employed to provide the smooth access of video streaming for clients in heterogeneous networks, and it consists of several sub-layer streams. To enable a smooth decoding on the client, the difference of the time to receive the corresponding sub-layer streams should be kept as small as possible (synchronization issue). Otherwise, the client may not able to decode the live streaming. The architecture is constructed by grouping the sharable APs and the clients by use of trace route information. The proposed mechanism is evaluated by the NS2 simulator. Simulation results indicate that the proposed mechanism is able to deliver the sub-layer streams in a timely manner to each client for smooth decoding. Furthermore, the proposed grouping mechanism is also very effective in saving the link bandwidth. Thus, the average bandwidth consumption rate of all links obtained by the proposed mechanism is much better (only about 8.93%) than that of random grouping.
{"title":"An efficient and locality-aware resource management scheme for SVC-based video streaming system on public-shared network","authors":"N. Huang, Hong-Yi Chang, Tzu-Chien Wang, Yeh-Sheng Lin, Yuan-Wei Lin, Shyr-Yuan Cheng, Jun-Jyi Lin","doi":"10.1109/APCC.2009.5375508","DOIUrl":"https://doi.org/10.1109/APCC.2009.5375508","url":null,"abstract":"This paper proposes a concept to construct a Traffic-Localized and Resource-Efficient tree-based architecture to support the delivery of an SVC-encoded live video streaming onto a Public-Shared Network. A Public-Shared Network consists of a large number of bandwidth sharable devices, such as sharable APs in a FON network. The SVC-encoded video streaming is employed to provide the smooth access of video streaming for clients in heterogeneous networks, and it consists of several sub-layer streams. To enable a smooth decoding on the client, the difference of the time to receive the corresponding sub-layer streams should be kept as small as possible (synchronization issue). Otherwise, the client may not able to decode the live streaming. The architecture is constructed by grouping the sharable APs and the clients by use of trace route information. The proposed mechanism is evaluated by the NS2 simulator. Simulation results indicate that the proposed mechanism is able to deliver the sub-layer streams in a timely manner to each client for smooth decoding. Furthermore, the proposed grouping mechanism is also very effective in saving the link bandwidth. Thus, the average bandwidth consumption rate of all links obtained by the proposed mechanism is much better (only about 8.93%) than that of random grouping.","PeriodicalId":217893,"journal":{"name":"2009 15th Asia-Pacific Conference on Communications","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133113032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-10-08DOI: 10.1109/APCC.2009.5375564
X. Fu, Hongming Zhang, M. Yao
In this paper, a novel photonic analog-to-digital conversion method is proposed, theoretically analyzed and numerically simulated. This method features simple configuration, because only one polarization modulator, several polarization controllers and several polarizers are required. Furthermore, this method mitigated the problem of bias-drift, which is common in some previous intensity modulating schemes.
{"title":"A new proposal of photonic analog-to-digital conversion based on polarization modulator and polarizer","authors":"X. Fu, Hongming Zhang, M. Yao","doi":"10.1109/APCC.2009.5375564","DOIUrl":"https://doi.org/10.1109/APCC.2009.5375564","url":null,"abstract":"In this paper, a novel photonic analog-to-digital conversion method is proposed, theoretically analyzed and numerically simulated. This method features simple configuration, because only one polarization modulator, several polarization controllers and several polarizers are required. Furthermore, this method mitigated the problem of bias-drift, which is common in some previous intensity modulating schemes.","PeriodicalId":217893,"journal":{"name":"2009 15th Asia-Pacific Conference on Communications","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133290643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-10-08DOI: 10.1109/APCC.2009.5375502
Leijia Wu, K. Sandrasegaran, M. Elkashlan
The introduction of Common Radio Resource Management (CRRM) facilitates the coordination of multiple overlapped Radio Access Technologies (RATs). A Network Controlled Cell Breathing (NCCB) RAT selection algorithm is proposed in the literature for combined GSM/UMTS networks. The setting of a proper path loss threshold is a key issue in the NCCB algorithm. In this paper, the relationship among overall downlink data throughput, throughput fairness and path loss threshold is studied. It is found that in some cases, an optimum path loss threshold value can be found to achieve better performance in terms of both overall throughput and throughput fairness. However, in other cases, a tradeoff has to be made between the overall throughput and the throughput fairness.
{"title":"Tradeoff between overall throughput and throughput fairness in network controlled cell breathing algorithm","authors":"Leijia Wu, K. Sandrasegaran, M. Elkashlan","doi":"10.1109/APCC.2009.5375502","DOIUrl":"https://doi.org/10.1109/APCC.2009.5375502","url":null,"abstract":"The introduction of Common Radio Resource Management (CRRM) facilitates the coordination of multiple overlapped Radio Access Technologies (RATs). A Network Controlled Cell Breathing (NCCB) RAT selection algorithm is proposed in the literature for combined GSM/UMTS networks. The setting of a proper path loss threshold is a key issue in the NCCB algorithm. In this paper, the relationship among overall downlink data throughput, throughput fairness and path loss threshold is studied. It is found that in some cases, an optimum path loss threshold value can be found to achieve better performance in terms of both overall throughput and throughput fairness. However, in other cases, a tradeoff has to be made between the overall throughput and the throughput fairness.","PeriodicalId":217893,"journal":{"name":"2009 15th Asia-Pacific Conference on Communications","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131789847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-10-08DOI: 10.1109/APCC.2009.5375681
J. Hwang, Jong Seok Park, J. Kim
In this paper, sensing algorithms to select the available sub-bands in the cognitive UWB system are proposed; grouped time division sensing technique and decision methods for sub-channel selection. We employ energy detection method for spectrum sensing, which has low complexity in the wide spectrum sensing. Grouped time division sensing technique is proposed to transmit training symbols and to measure the interference level of sub-bands efficiently. It simplifies the procedure of spectrum sensing, because this scheme requires less number of sensing blocks in receiver. Finally, the decision methods, hard and soft decision, are proposed and compared. Proposed sensing algorithms in this paper can provide wider application of cognitive UWB system and smarter service in coexisting with other wireless system.
{"title":"The spectrum sensing algorithm using the soft decision algorithm in cognitive UWB system","authors":"J. Hwang, Jong Seok Park, J. Kim","doi":"10.1109/APCC.2009.5375681","DOIUrl":"https://doi.org/10.1109/APCC.2009.5375681","url":null,"abstract":"In this paper, sensing algorithms to select the available sub-bands in the cognitive UWB system are proposed; grouped time division sensing technique and decision methods for sub-channel selection. We employ energy detection method for spectrum sensing, which has low complexity in the wide spectrum sensing. Grouped time division sensing technique is proposed to transmit training symbols and to measure the interference level of sub-bands efficiently. It simplifies the procedure of spectrum sensing, because this scheme requires less number of sensing blocks in receiver. Finally, the decision methods, hard and soft decision, are proposed and compared. Proposed sensing algorithms in this paper can provide wider application of cognitive UWB system and smarter service in coexisting with other wireless system.","PeriodicalId":217893,"journal":{"name":"2009 15th Asia-Pacific Conference on Communications","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128997256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-10-08DOI: 10.1109/APCC.2009.5375602
Yu‐Lin Wang, M. Her, Chi-Feng Lin
The low noise and high gain differential Low Noise Amplifier (LNA) was designed for an IEEE 802.16 Worldwide Interoperability Microwave Access (WiMAX) application. This paper presents a 3.3 GHz to 3.8 GHz CMOS LNA with differential and cascode circuits to reduce the noise figure (NF) and enhance the gain. The LNA was fabricated with Taiwan Semiconductor Manufacturing Company (TSMC) 0.18 μm 1P6M standard CMOS process, the cascode technique can reduce the miller effect of gate-drain capacitor Cgd in order to enhance gain, and the active balun can enhance gain and reduce noise. The circuit performances were measured by using on-wafer test. The differential LNA exhibits that the noise figure is 3.3 dB ~ 3.8 dB from 3.3 GHz to 3.8 GHz, the maximum power gain S21 is 14.4±0.6 dB and S31 is 12.4 ± 0.5 dB. The output return loss S22 and S33 are less than −11 dB. The power consumption is 14.8 mW at VDD=1.2 V.
{"title":"Design and implementation of a differential LNA for WiMAX system","authors":"Yu‐Lin Wang, M. Her, Chi-Feng Lin","doi":"10.1109/APCC.2009.5375602","DOIUrl":"https://doi.org/10.1109/APCC.2009.5375602","url":null,"abstract":"The low noise and high gain differential Low Noise Amplifier (LNA) was designed for an IEEE 802.16 Worldwide Interoperability Microwave Access (WiMAX) application. This paper presents a 3.3 GHz to 3.8 GHz CMOS LNA with differential and cascode circuits to reduce the noise figure (NF) and enhance the gain. The LNA was fabricated with Taiwan Semiconductor Manufacturing Company (TSMC) 0.18 μm 1P6M standard CMOS process, the cascode technique can reduce the miller effect of gate-drain capacitor C<inf>gd</inf> in order to enhance gain, and the active balun can enhance gain and reduce noise. The circuit performances were measured by using on-wafer test. The differential LNA exhibits that the noise figure is 3.3 dB ~ 3.8 dB from 3.3 GHz to 3.8 GHz, the maximum power gain S<inf>21</inf> is 14.4±0.6 dB and S<inf>31</inf> is 12.4 ± 0.5 dB. The output return loss S<inf>22</inf> and S<inf>33</inf> are less than −11 dB. The power consumption is 14.8 mW at V<inf>DD</inf>=1.2 V.","PeriodicalId":217893,"journal":{"name":"2009 15th Asia-Pacific Conference on Communications","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122614502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-10-08DOI: 10.1109/APCC.2009.5375668
Shudong Fang, S. Berber, A. Swain
Closed-form expression of average Bit Error Rate (BER) is developed for Chip-Interleaved DS-CDMA system that conducts M-ary communication and non-coherent demodulation in AWGN channel with flat Rayleigh fading. The transmitter uses BPSK modulation and employs binary pseudo-random sequences for symbol-spreading. In receiver the non-coherent demodulation is based on the optimal quadrature demodulator to cancel the phase angles of received signals. Numerical results of simulations greatly agree with the analytical results of the developed expression.
{"title":"Closed-form average BER expression for chip-interleaved DS-CDMA system conducting M-ary communication and noncoherent demodulation in flat Rayleigh fading channel","authors":"Shudong Fang, S. Berber, A. Swain","doi":"10.1109/APCC.2009.5375668","DOIUrl":"https://doi.org/10.1109/APCC.2009.5375668","url":null,"abstract":"Closed-form expression of average Bit Error Rate (BER) is developed for Chip-Interleaved DS-CDMA system that conducts M-ary communication and non-coherent demodulation in AWGN channel with flat Rayleigh fading. The transmitter uses BPSK modulation and employs binary pseudo-random sequences for symbol-spreading. In receiver the non-coherent demodulation is based on the optimal quadrature demodulator to cancel the phase angles of received signals. Numerical results of simulations greatly agree with the analytical results of the developed expression.","PeriodicalId":217893,"journal":{"name":"2009 15th Asia-Pacific Conference on Communications","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123886783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-10-08DOI: 10.1109/APCC.2009.5375655
Ningbing Hou, Zhiqun Li
Conventional charge pumps (CPs) all share a problem of current mismatching, which dominates the phase noise of phase-locked loop (PLL). A high performance charge pump circuit in 0.18μm CMOS process is presented. A rail-to-rail error operational amplifier with reference circuit and self-biasing cascode current mirror enables the charge pump current to be well matched in a wide output voltage range. Simulation results show that the current mismatching can be less than 0.01% within output voltage range of 0.01V to 1.6V, with the charge pump current of 100μA. The circuit dissipates 3mW from a single 1.8-V supply.
{"title":"Design of high performance CMOS charge pump for phase-locked loops synthesizer","authors":"Ningbing Hou, Zhiqun Li","doi":"10.1109/APCC.2009.5375655","DOIUrl":"https://doi.org/10.1109/APCC.2009.5375655","url":null,"abstract":"Conventional charge pumps (CPs) all share a problem of current mismatching, which dominates the phase noise of phase-locked loop (PLL). A high performance charge pump circuit in 0.18μm CMOS process is presented. A rail-to-rail error operational amplifier with reference circuit and self-biasing cascode current mirror enables the charge pump current to be well matched in a wide output voltage range. Simulation results show that the current mismatching can be less than 0.01% within output voltage range of 0.01V to 1.6V, with the charge pump current of 100μA. The circuit dissipates 3mW from a single 1.8-V supply.","PeriodicalId":217893,"journal":{"name":"2009 15th Asia-Pacific Conference on Communications","volume":"262 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121411688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-10-08DOI: 10.1109/APCC.2009.5375652
Yan Ye, Taijun Liu, Kunsheng Ren, Xingbin Zeng
Generalized Hammerstein models can be used to accurately mimic the dynamic nonlinear behaviors of RF power amplifiers or transmitters. A high efficient parameter extraction algorithm for the generalized Hammerstein model is an essential problem for implementing the nonlinear model in a cheap microprocessor. In this paper, a modified systolic array based QRD-RLS algorithm, which is suitable for implementing in a FPGA-based soft-core microprocessor such as Altera NIOS II, is presented to extract the parameters of the generalized Hammerstein models of an RF power amplifier. The validation results based on a LDMOS power amplifier with a 4-carrier 3GPP WCDMA signal reveal that the modified systolic array based QRD-RLS algorithm can accurately identify the model parameters.
{"title":"Modified systolic array implementation of QRD-RLS algorithms for solving the generalized Hammerstein models","authors":"Yan Ye, Taijun Liu, Kunsheng Ren, Xingbin Zeng","doi":"10.1109/APCC.2009.5375652","DOIUrl":"https://doi.org/10.1109/APCC.2009.5375652","url":null,"abstract":"Generalized Hammerstein models can be used to accurately mimic the dynamic nonlinear behaviors of RF power amplifiers or transmitters. A high efficient parameter extraction algorithm for the generalized Hammerstein model is an essential problem for implementing the nonlinear model in a cheap microprocessor. In this paper, a modified systolic array based QRD-RLS algorithm, which is suitable for implementing in a FPGA-based soft-core microprocessor such as Altera NIOS II, is presented to extract the parameters of the generalized Hammerstein models of an RF power amplifier. The validation results based on a LDMOS power amplifier with a 4-carrier 3GPP WCDMA signal reveal that the modified systolic array based QRD-RLS algorithm can accurately identify the model parameters.","PeriodicalId":217893,"journal":{"name":"2009 15th Asia-Pacific Conference on Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128470677","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-10-08DOI: 10.1109/APCC.2009.5375492
D. Hu, M. Wang, F. Lau, Q. Peng
Random network coding based on the generation concept provides various benefits such as reduced system complexity. However, various generation updating processes used in general result in a throughput loss. In this paper, we propose a network coding scheme using a concept we call “generation crossing”. We also introduce a full cardinality precode, which enables the receiver to recover the lost packets when only a subset of the linearly independent encoded packets is received at the destination. We show that the successful delivery probability of all generations increases remarkably with a small number of overlapped packets between successive generations.
{"title":"A precoding scheme with generation crossing for network coding","authors":"D. Hu, M. Wang, F. Lau, Q. Peng","doi":"10.1109/APCC.2009.5375492","DOIUrl":"https://doi.org/10.1109/APCC.2009.5375492","url":null,"abstract":"Random network coding based on the generation concept provides various benefits such as reduced system complexity. However, various generation updating processes used in general result in a throughput loss. In this paper, we propose a network coding scheme using a concept we call “generation crossing”. We also introduce a full cardinality precode, which enables the receiver to recover the lost packets when only a subset of the linearly independent encoded packets is received at the destination. We show that the successful delivery probability of all generations increases remarkably with a small number of overlapped packets between successive generations.","PeriodicalId":217893,"journal":{"name":"2009 15th Asia-Pacific Conference on Communications","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129051081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-10-08DOI: 10.1109/APCC.2009.5375560
Yunxiao Zhang, Z. Liao, Linjuan Zhao, Jiao-qing Pan, Wei Wang
A novel compact three port optically-controlled optical switch made by a waveguide uni-traveling-carrier photodiode integrated with a waveguide electro-absorption modulator on n-InP substrate was reported. The device, with a 450 Ω thin-film resistor and a bypass capacitor integrated on chip, demonstrates over 2GHz 3-dB bandwidth.
{"title":"Novel integrated waveguide PD/EAM photonic switch based on N-InP","authors":"Yunxiao Zhang, Z. Liao, Linjuan Zhao, Jiao-qing Pan, Wei Wang","doi":"10.1109/APCC.2009.5375560","DOIUrl":"https://doi.org/10.1109/APCC.2009.5375560","url":null,"abstract":"A novel compact three port optically-controlled optical switch made by a waveguide uni-traveling-carrier photodiode integrated with a waveguide electro-absorption modulator on n-InP substrate was reported. The device, with a 450 Ω thin-film resistor and a bypass capacitor integrated on chip, demonstrates over 2GHz 3-dB bandwidth.","PeriodicalId":217893,"journal":{"name":"2009 15th Asia-Pacific Conference on Communications","volume":"237 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115999461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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