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2005 Asia-Pacific Conference on Communications最新文献

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RF Building Blocks and Entertainment SoCs for Mobile Telecommunication Platforms 移动通信平台的射频构建模块和娱乐soc
2005 Asia-Pacific Conference on Communications Pub Date : 2005-12-12 DOI: 10.1109/APCC.2005.1554097
J. van der Tang, H. van Rumpt, D. Kasperkovitz, A. V. van Roermund
{"title":"RF Building Blocks and Entertainment SoCs for Mobile Telecommunication Platforms","authors":"J. van der Tang, H. van Rumpt, D. Kasperkovitz, A. V. van Roermund","doi":"10.1109/APCC.2005.1554097","DOIUrl":"https://doi.org/10.1109/APCC.2005.1554097","url":null,"abstract":"Both for system-in-a-package (SiP) and systems-on-a-chip (SoCs) solutions for applications on mobile telecommunication platforms, power dissipation, size and cost are of prime importance. Advanced CMOS processes allow the introduction of intelligence on chip creating so-called smart SoCs. The vision for these \"smart\" SoCs is to re-use programmable resources on-chip for calibration purposes to enhance performance or reduce power consumption. After calibration these resources, e.g. FPGAs, can be re-used for normal system operation. In cheaper main-stream BiCMOS processes complete integration and smartness can be achieved by taking revolutionary choices on the architectural level. Two examples of novel RF architectures are highlighted, which resulted in the first \"no-external components\" FM radio and TV tuner for mobile telecommunication platforms. Both SoCs make use of resources that are generally available on mobile platforms like a reference clock and a microprocessor to make them \"smart\". Key RF building blocks of the entertainment SoCs are discussed in detail. In particular, a wideband LNA, high precision filters and an octave tunable quadrature oscillator","PeriodicalId":176147,"journal":{"name":"2005 Asia-Pacific Conference on Communications","volume":"221 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115647357","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}
引用次数: 2
The Behavior of MANET Routing Protocols in Realistic Environments 现实环境下MANET路由协议的行为
2005 Asia-Pacific Conference on Communications Pub Date : 2005-12-12 DOI: 10.1109/APCC.2005.1554194
Kwan-Wu Chin
{"title":"The Behavior of MANET Routing Protocols in Realistic Environments","authors":"Kwan-Wu Chin","doi":"10.1109/APCC.2005.1554194","DOIUrl":"https://doi.org/10.1109/APCC.2005.1554194","url":null,"abstract":"This paper presents an analysis of MANET routing protocols' behavior in realistic channel fading scenarios. The motivation of this study was due to our previous testbed experimentations where we found that AODV and DSDV's performance did not match simulation results, primarily due to the use of a simple radio propagation model that did not take into account transient links caused by small-scale fading. Henceforth, we extended the ns-2 simulator with a realistic radio propagation model, that incorporated Rayleigh fading, to gain insights into the impact of transient links on AODV, DSR, and DSDVs behaviour. Our simulation studies explain each protocol's key behavior that leads to the following conclusions: (1) routing through stable routes is important, (2) hop count is the root cause of poor performance, (3) the 2-ray ground radio propagation model is inappropriate for simulating ad-hoc protocols in indoor environments, and (4) local recovery is important","PeriodicalId":176147,"journal":{"name":"2005 Asia-Pacific Conference on Communications","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115762518","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}
引用次数: 21
An Optimized Ad-hoc On-demand Multipath Distance Vector(AOMDV) Routing Protocol 一种优化的Ad-hoc按需多路径距离矢量路由协议
2005 Asia-Pacific Conference on Communications Pub Date : 2005-12-12 DOI: 10.1109/APCC.2005.1554125
Yuhua Yuan, Hui-Min Chen, M. Jia
{"title":"An Optimized Ad-hoc On-demand Multipath Distance Vector(AOMDV) Routing Protocol","authors":"Yuhua Yuan, Hui-Min Chen, M. Jia","doi":"10.1109/APCC.2005.1554125","DOIUrl":"https://doi.org/10.1109/APCC.2005.1554125","url":null,"abstract":"To avoid frequent route discovery, various multipath routing protocol has been proposed based on the existing single path routing protocol in ad hoc networks. Ad hoc on-demand multipath distance vector (AOMDV) is one of extensions to the well-studied ad hoc on distance vector (AODV). In this paper an optimized AOMDV (OAOMDV) is presented to solve the \"route cutoff\" problem in AOMDV. The proposed protocol adds a new scheme into AOMDV and simulation results show the performance improvement","PeriodicalId":176147,"journal":{"name":"2005 Asia-Pacific Conference on Communications","volume":"744 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116094750","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}
引用次数: 129
On Unicast based Recovery for Multicast Content Distribution considering XOR-FEC 考虑XOR-FEC的组播内容分发单播恢复
2005 Asia-Pacific Conference on Communications Pub Date : 2005-12-12 DOI: 10.1109/APCC.2005.1554223
C. Sasaki, T. Hasegawa, Osamu Kobayashi, S. Ano, Toru Hasegawa Kddi
{"title":"On Unicast based Recovery for Multicast Content Distribution considering XOR-FEC","authors":"C. Sasaki, T. Hasegawa, Osamu Kobayashi, S. Ano, Toru Hasegawa Kddi","doi":"10.1109/APCC.2005.1554223","DOIUrl":"https://doi.org/10.1109/APCC.2005.1554223","url":null,"abstract":"In this paper, we propose a fail-safe and efficient download completion scheme for reliable multicast to which FEC (forward error correction) is applied with practical constraints on multicast transmission time. Recently, erasure codes based on XOR operation have become major FEC candidates for multicast content file distribution over the Internet or mobile networks in terms of their recovery performance and processing overheads. In particular LT (Luby transform) codes are effective in a heterogeneous multicast environment because they can achieve higher reliability by expanding the receiving time at each client. However, multicast transmission time can be restricted due to operational reasons considering multicast resource efficiency. In order to assure all the clients of download completion under such conditions, we newly designed a unicast based recovery mechanism considering LT codes characteristics. We confirmed the efficiency of our proposed mechanism by computer simulation","PeriodicalId":176147,"journal":{"name":"2005 Asia-Pacific Conference on Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116581726","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}
引用次数: 2
A Frequency Reuse Scheme for GPRS Network 一种GPRS网络频率复用方案
2005 Asia-Pacific Conference on Communications Pub Date : 2005-12-12 DOI: 10.1109/APCC.2005.1554187
M. Gitlits, P. Ghanaati-Nazari, J. Yin
{"title":"A Frequency Reuse Scheme for GPRS Network","authors":"M. Gitlits, P. Ghanaati-Nazari, J. Yin","doi":"10.1109/APCC.2005.1554187","DOIUrl":"https://doi.org/10.1109/APCC.2005.1554187","url":null,"abstract":"In this paper, a novel frequency reuse scheme, 2*6 reuse, is proposed for the GPRS network. The simulation results show that 2*6 reuse outperforms the 1*3 frequency reuse scheme, which is usually considered as optimal. Moreover, compared with recent proposals such as 3*3, and 2*2 reuse schemes, 2*6 demonstrates superior performance. For example, with 5 hopping transceivers in a cell and 29 hopping frequencies, the average overall cell area throughput enhancement over 1*3 reuse is about 40% for the 2*2 reuse, 55% for the 3*3 reuse and 85% for the 2*6 reuse. The 2*6 reuse scheme also provides the highest cell capacity. Importantly, that in contrast to other simulated reuse schemes, the 2*6 reuse brings the average throughput with CS3 coding scheme very close to the achievable maximum and provides good throughput even in remote locations within the cell","PeriodicalId":176147,"journal":{"name":"2005 Asia-Pacific Conference on Communications","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114489440","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}
引用次数: 0
BER Performance of Two Transmit Diversity Schemes with Perfect/Imperfect Channel Evaluation in Wireless Communications 无线通信中两种完全/不完全信道评估发射分集方案的误码率性能
2005 Asia-Pacific Conference on Communications Pub Date : 2005-12-12 DOI: 10.1109/APCC.2005.1554209
D. Xiao, Jie Zhou
{"title":"BER Performance of Two Transmit Diversity Schemes with Perfect/Imperfect Channel Evaluation in Wireless Communications","authors":"D. Xiao, Jie Zhou","doi":"10.1109/APCC.2005.1554209","DOIUrl":"https://doi.org/10.1109/APCC.2005.1554209","url":null,"abstract":"Here, we present an approach to investigate perfect/imperfect channel detection in the maximal ratio receiver combined scheme (MRRC) and a simple transmit diversity scheme (STD). In order to effectively make use of the transmit diversity techniques, the same approach is extended to process the situation of one transmit antenna and N receive antennas in the MRRC scheme (1 times N MRRC) and two transmit antennas and N receive antennas in the STD scheme (2 times N STD), in which the effects of perfect/imperfect channel detection and the diversity reception with independent Rayleigh-fading signals are evaluated and compared","PeriodicalId":176147,"journal":{"name":"2005 Asia-Pacific Conference on Communications","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122163321","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}
引用次数: 0
A Circular Polarized Metallic Patch Antenna for RFID Reader 一种用于RFID阅读器的圆形极化金属贴片天线
2005 Asia-Pacific Conference on Communications Pub Date : 2005-12-12 DOI: 10.1109/APCC.2005.1554030
J. Lee, Naesoo Kim, C. Pyo
{"title":"A Circular Polarized Metallic Patch Antenna for RFID Reader","authors":"J. Lee, Naesoo Kim, C. Pyo","doi":"10.1109/APCC.2005.1554030","DOIUrl":"https://doi.org/10.1109/APCC.2005.1554030","url":null,"abstract":"A novel single feed circularly polarized metallic patch antenna for RFID reader is proposed. The proposed antenna has a simple structure, it has corner truncated square patch, ground plane and a probe feed. In addition to structure of the proposed antenna is simple and low cost. Experimental results of a constructed prototype with the center operating frequency at 911 MHz showed that the antenna has an impedance bandwidth (2:1 VSWR) of about 23 MHz, a 3 dB axial ratio of about 9 MHz, and a gain level of about 9 dBi","PeriodicalId":176147,"journal":{"name":"2005 Asia-Pacific Conference on Communications","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128989276","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}
引用次数: 43
Fast IP Table Lookup Construction Using Lexicographic Prefix Ordering 使用字典前缀排序的快速IP表查找构造
2005 Asia-Pacific Conference on Communications Pub Date : 2005-12-12 DOI: 10.1109/APCC.2005.1554073
L. Hiryanto, S. Soh, S. Rai, R. Gopalan
{"title":"Fast IP Table Lookup Construction Using Lexicographic Prefix Ordering","authors":"L. Hiryanto, S. Soh, S. Rai, R. Gopalan","doi":"10.1109/APCC.2005.1554073","DOIUrl":"https://doi.org/10.1109/APCC.2005.1554073","url":null,"abstract":"Crescenzi et al. have proposed a fast full-expansion-compression (FEC) technique that requires exactly three memory accesses for each IP lookup. However, prefix updates on their FEC scheme require the forwarding table data structure to be rebuilt from scratch. Therefore, fast table reconstruction is important to make the scheme effective for use in a dynamic environment. In this paper, we propose an efficient technique to reduce the FEC table construction time. Our approach generates the RLE sequences for the forwarding table directly from a list of decreasing lexicographic ordered prefixes to avoid the expansion step of the previous technique. We also propose an improved unification technique to construct the FEC tables more efficiently. Our approach has been implemented in C, and several experiments using six databases from some real IPv4 router show that our proposed technique runs 4 to 29 times faster than the previous technique","PeriodicalId":176147,"journal":{"name":"2005 Asia-Pacific Conference on Communications","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126814325","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}
引用次数: 1
A Dual Reservation MAC Protocol based on CDMA for Ad hoc Networks 一种基于CDMA的自组网双保留MAC协议
2005 Asia-Pacific Conference on Communications Pub Date : 2005-12-12 DOI: 10.1109/APCC.2005.1554017
M. Jia, Hui-Min Chen, Yuhua Yuan
{"title":"A Dual Reservation MAC Protocol based on CDMA for Ad hoc Networks","authors":"M. Jia, Hui-Min Chen, Yuhua Yuan","doi":"10.1109/APCC.2005.1554017","DOIUrl":"https://doi.org/10.1109/APCC.2005.1554017","url":null,"abstract":"Multi-channel research in wireless ad hoc networks has drawn more attention in recent years. Several MAC protocols have been proposed for multi-channel access. However, they either suffer from additional hardware and algorithm cost or weak broadcast support. In this paper, a dual reservation MAC protocol based on CDMA (DRMC) is proposed to solve those problems. Code synchronization is dynamically implemented through RTS/CTS handshake. Once communication is set up, both sides can reserve resource through piggyback. And furthermore, broadcast messages are well supported by an out-of-band busy tone. According to simulation results, we have validated that DRMC performs significantly better than IEEE 802.11 standard which provides multiple channels while its MAC is still designed for a single channel","PeriodicalId":176147,"journal":{"name":"2005 Asia-Pacific Conference on Communications","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121433310","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}
引用次数: 5
Effect of Access Control Scheme based on the Estimation of Offered Load on the CSK/SS Random Access Systems 基于预估提供负荷的访问控制方案对CSK/SS随机接入系统的影响
2005 Asia-Pacific Conference on Communications Pub Date : 2005-12-12 DOI: 10.1109/APCC.2005.1554028
N. Komuro, H. Habuchi
{"title":"Effect of Access Control Scheme based on the Estimation of Offered Load on the CSK/SS Random Access Systems","authors":"N. Komuro, H. Habuchi","doi":"10.1109/APCC.2005.1554028","DOIUrl":"https://doi.org/10.1109/APCC.2005.1554028","url":null,"abstract":"In this paper, an access control scheme on the code shift keying spread spectrum (CSK/SS) random access systems is evaluated. In this system, each user estimates the number of transmitting users based on the received power and decides whether to transmit a packet or not. When a user becomes ready to send, the user estimates the number of transmitting users. If it is equal or less than a certain threshold, q, the user transmits a packet with a probability p = 1. Otherwise, the user transmits a packet with 0 les p < 1. Consequently, it is found that the throughput performance of the CSK/SS random access system improves by applying this access control scheme","PeriodicalId":176147,"journal":{"name":"2005 Asia-Pacific Conference on Communications","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124080347","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}
引用次数: 2
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