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2007 IEEE Sarnoff Symposium最新文献

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Study of MFSK/FH-CDMA wireless communication systems without symbol-synchronous assumption 无符号同步假设的MFSK/FH-CDMA无线通信系统研究
2007 IEEE Sarnoff Symposium Pub Date : 2007-04-01 DOI: 10.1109/SARNOF.2007.4567326
Tsung-Chi Lin, Chia-Cheng Hsu, Cheng-Yuan Chang, Guu-chang Yang, W. Kwong
{"title":"Study of MFSK/FH-CDMA wireless communication systems without symbol-synchronous assumption","authors":"Tsung-Chi Lin, Chia-Cheng Hsu, Cheng-Yuan Chang, Guu-chang Yang, W. Kwong","doi":"10.1109/SARNOF.2007.4567326","DOIUrl":"https://doi.org/10.1109/SARNOF.2007.4567326","url":null,"abstract":"We propose a more accurate method to analyze multilevel frequency-shift-keying frequency-hopping code-division multiple-access (MFSK/FH-CDMA) wireless communication systems using ldquoone-hitrdquo FH patterns, instead of random FH patterns. By also removing the over-optimistic symbol-synchronous assumption, the new method provides a more realistic performance analysis as the MFSK modulation may result in two hits even when one-hit FH patterns are used if symbol transmissions are not synchronized.","PeriodicalId":293243,"journal":{"name":"2007 IEEE Sarnoff Symposium","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132544540","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: 10
On lattice decoding of space-time block codes for asynchronous cooperative relaying 异步协同中继空时分组码的点阵译码
2007 IEEE Sarnoff Symposium Pub Date : 2007-04-01 DOI: 10.1109/SARNOF.2007.4567358
A. R. Hammons, M. O. Damen
{"title":"On lattice decoding of space-time block codes for asynchronous cooperative relaying","authors":"A. R. Hammons, M. O. Damen","doi":"10.1109/SARNOF.2007.4567358","DOIUrl":"https://doi.org/10.1109/SARNOF.2007.4567358","url":null,"abstract":"Li and Xia have recently investigated the design of space-time codes that achieve full spatial diversity for asynchronous cooperative communications. They show that certain of the binary space-time trellis codes derived from the Hammons-El Gamal stacking construction are delay tolerant and can be used in the multilevel code constructions by Lu and Kumar to produce delay tolerant space-time codes for PSK and QAM signaling. In prior work, the first author has developed generalizations of the Lu-Kumar construction for more general AM-PSK constellations that also preserve the delay tolerance of the underlying constituent codes and exhibited a new construction of short block codes that achieve significant levels of delay tolerance. This paper discusses how lattice decoding techniques can be adapted to perform decoding of such STBC for asynchronous diversity.","PeriodicalId":293243,"journal":{"name":"2007 IEEE Sarnoff Symposium","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132661226","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: 4
Disruption tolerant chat 中断容忍聊天
2007 IEEE Sarnoff Symposium Pub Date : 2007-04-01 DOI: 10.1109/SARNOF.2007.4567370
S. Parikh, J. Andresen, R. Durst
{"title":"Disruption tolerant chat","authors":"S. Parikh, J. Andresen, R. Durst","doi":"10.1109/SARNOF.2007.4567370","DOIUrl":"https://doi.org/10.1109/SARNOF.2007.4567370","url":null,"abstract":"Internet Relay Chat (IRC) is a critical application in military networks for maintaining situational awareness and conducting battle management at all echelons. But these networks are often subject to frequent disconnections, limited bandwidth, and long delays, especially when using satellite services and field radios. Such conditions are inhospitable to TCP, and thus the standard IRC protocol, which uses TCP for transport. In this work, we have applied the emerging Delay Tolerant Networking architecture to IRC to assist operations in challenged networks. Using the Delay Tolerant Networking Research Grouppsilas (DTNRG) Reference Implementation of the Bundle Protocol, we have developed a transparent proxy for server-to-server IRC connections that encapsulates IRC messages over Bundles and performs application-specific services useful in disruption-prone conditions.","PeriodicalId":293243,"journal":{"name":"2007 IEEE Sarnoff Symposium","volume":"221 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133421394","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
Distributed spectrum and power control in cognitive radio based wireless ad hoc networks 基于认知无线电的无线自组网中的分布式频谱和功率控制
2007 IEEE Sarnoff Symposium Pub Date : 2007-04-01 DOI: 10.1109/SARNOF.2007.4567328
Q. Qu, L. Milstein, D. Vaman
{"title":"Distributed spectrum and power control in cognitive radio based wireless ad hoc networks","authors":"Q. Qu, L. Milstein, D. Vaman","doi":"10.1109/SARNOF.2007.4567328","DOIUrl":"https://doi.org/10.1109/SARNOF.2007.4567328","url":null,"abstract":"In this paper, we propose a cognitive radio-based multi-user resource allocation framework for mobile ad hoc networks using multi-carrier DS CDMA modulation over a frequency-selective fading channel. In particular, given pre-existing communications in the spectrum where the system is operating, in addition to potential narrow-band interference, a channel sensing and estimation mechanism is provided to obtain information such as subcarrier availability, noise power and channel gain. Both frequency spectrum and power are allocated to emerging new users (i.e., cognitive radio users), based on the distributed multi-user resource allocation framework, in order to satisfy the target data rate and the power constraint of each cognitive radio user, while attempting to avoid interference to the existing users as well as minimize total power consumption of the network.","PeriodicalId":293243,"journal":{"name":"2007 IEEE Sarnoff Symposium","volume":"340 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134032891","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: 4
11 Gb/s limiting amplifier flip-chip assembled in a BGA package 11gb /s限制放大器倒装芯片组装在一个BGA封装
2007 IEEE Sarnoff Symposium Pub Date : 2007-04-01 DOI: 10.1109/SARNOF.2007.4567379
W. Titus
{"title":"11 Gb/s limiting amplifier flip-chip assembled in a BGA package","authors":"W. Titus","doi":"10.1109/SARNOF.2007.4567379","DOIUrl":"https://doi.org/10.1109/SARNOF.2007.4567379","url":null,"abstract":"A 53 dB gain limiting amplifier for OC-192 and 10 GbE applications is developed in a 50 GHz fT SiGe SOI complimentary bipolar process, and has 5 mV pk-pk sensitivity, 1.25 V pk-pk maximum input signal, 14 ps (20/80%) rise/fall times and 450 mV pk-pk output into matched differential 50 Ohm loads, consuming 430 mW on a 3.3 V supply. Input Cherry-Hooper gain stages limit the -3 dB bandwidth to 11 GHz effectively filtering integrated noise to obtain low input sensitivity. A 21 GHz output bandwidth necessary for extremely fast rise times is obtained by incorporating output buffer transistor, ESD and pad parasitics into on-chip transmission lines (TLs) and by using flip chip assembly and ball grid array packaging techniques.","PeriodicalId":293243,"journal":{"name":"2007 IEEE Sarnoff Symposium","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131052267","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 receiver initiated power control multi-access protocol in wireless ad hoc networks 一种无线自组网中接收机发起的功率控制多址协议
2007 IEEE Sarnoff Symposium Pub Date : 2007-04-01 DOI: 10.1109/SARNOF.2007.4567332
Swades De, K. Egoh, Gaurav Dosi
{"title":"A receiver initiated power control multi-access protocol in wireless ad hoc networks","authors":"Swades De, K. Egoh, Gaurav Dosi","doi":"10.1109/SARNOF.2007.4567332","DOIUrl":"https://doi.org/10.1109/SARNOF.2007.4567332","url":null,"abstract":"In this paper, we address the issue of transmission power control (TPC) in wireless ad hoc networks. Power control plays an important role in energy saving and network performance enhancement. However, the existing TPC schemes either face the problem of hidden and exposed terminal or have additional hardware requirements. We propose a novel distributed power control protocol, called Receiver Initiated power control Multi-Access (RIMA) that ideally eliminates the hidden terminal problem and at the same time enjoys the same single-channel, single-transceiver design of nodes in IEEE 802.11 and 802.15 MAC standards. An enhanced version of RIMA is also proposed where reduced power RTS transmission is allowed to improve spatial reuse of the wireless channel. Simulations are performed to demonstrate the enhanced frame loss rate and network delay performance of the proposed approach with respect to a competitive approach, called transmitter initiated power control MAC protocol.","PeriodicalId":293243,"journal":{"name":"2007 IEEE Sarnoff Symposium","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115340026","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: 7
Optimal power allocation for transmitter selection in MISO Rayleigh fading channels MISO瑞利衰落信道中发射机选择的最优功率分配
2007 IEEE Sarnoff Symposium Pub Date : 2007-04-01 DOI: 10.1109/SARNOF.2007.4567392
V.V.M Niranjan Kumar, P. Reddy, M. Khan, M. Srinivas
{"title":"Optimal power allocation for transmitter selection in MISO Rayleigh fading channels","authors":"V.V.M Niranjan Kumar, P. Reddy, M. Khan, M. Srinivas","doi":"10.1109/SARNOF.2007.4567392","DOIUrl":"https://doi.org/10.1109/SARNOF.2007.4567392","url":null,"abstract":"In this paper we derive optimal power allocation (PA) in space and time that minimizes BER for transmitter selection in multi-input-single-output (MISO) Rayliegh fading channels assuming perfect channel state information (CSI) is available at receiver and transmitter. This power allocation scheme achieves exponential diversity order with a single RF front end and requires feedback of the best channel only. The presented scheme results in 7.5 dB gain over optimal single-input-single-output (SISO) power allocation scheme for 4-QAM modulation at SER of 10-4.","PeriodicalId":293243,"journal":{"name":"2007 IEEE Sarnoff Symposium","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122492847","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 study on the channel and BER-SNR performance of ultra wide band systems applied in commercial vehicles 商用车超宽带系统信道性能及BER-SNR性能研究
2007 IEEE Sarnoff Symposium Pub Date : 2007-04-01 DOI: 10.1109/SARNOF.2007.4567331
W. Aldeeb, Weidong Xiang, P. Richardson
{"title":"A study on the channel and BER-SNR performance of ultra wide band systems applied in commercial vehicles","authors":"W. Aldeeb, Weidong Xiang, P. Richardson","doi":"10.1109/SARNOF.2007.4567331","DOIUrl":"https://doi.org/10.1109/SARNOF.2007.4567331","url":null,"abstract":"The applications of ultra wideband (UWB) systems in commercial vehicles are increasingly attracting attention recently. This paper aims to lay a solid foundation for the use of UWB radio in vehicular environments by measuring both intra-vehicle and inter-vehicle UWB channels. At first, a comprehensive measurement campaign was conducted to gather a set of channel impulse responses of UWB channels under several typical scenarios. The UWB vehicular channel is analyzed and compared with the IEEE 802.15.3a indoor model. Next, the bit error rate (BER) against signal to noise ratio (SNR) curves of UWB systems applied in commercial vehicles are presented, analyzed and compared to the performance of indoor UWB systems based on the IEEE 802.15.3a model.","PeriodicalId":293243,"journal":{"name":"2007 IEEE Sarnoff Symposium","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122008375","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: 9
Enrichment of speech calls by live video 通过实时视频丰富语音通话
2007 IEEE Sarnoff Symposium Pub Date : 2007-04-01 DOI: 10.1109/SARNOF.2007.4567348
T. Stockhammer, I. Varga
{"title":"Enrichment of speech calls by live video","authors":"T. Stockhammer, I. Varga","doi":"10.1109/SARNOF.2007.4567348","DOIUrl":"https://doi.org/10.1109/SARNOF.2007.4567348","url":null,"abstract":"This contribution addresses the case when live packet-switched video is used to enrich circuit-switched speech calls in mobile telephony. Circuit-switched and packet-switched transmissions generally operate on completely different transmission paths resulting in different QoS in terms of delay and loss rates. In this case, video and audio data recorded at the same time are not multiplexed together and might arrive at completely different time instances at the receiver. This is a major challenge for the receiver and the service as lip synchronicity between the voice and the video can generally not be expected. Our presented method solves the synchronization problem purely by the use of signal processing, i.e. no inclusion of time stamps is needed. The method is simple to implement and it is able to handle signal disturbances over the link.","PeriodicalId":293243,"journal":{"name":"2007 IEEE Sarnoff Symposium","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131487509","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
Reduced-complexity hybrid time/frequency channel estimation for DVB-H 低复杂度DVB-H混合时频信道估计
2007 IEEE Sarnoff Symposium Pub Date : 2007-04-01 DOI: 10.1109/SARNOF.2007.4567343
Sili Lu, N. Al-Dhahir
{"title":"Reduced-complexity hybrid time/frequency channel estimation for DVB-H","authors":"Sili Lu, N. Al-Dhahir","doi":"10.1109/SARNOF.2007.4567343","DOIUrl":"https://doi.org/10.1109/SARNOF.2007.4567343","url":null,"abstract":"Orthogonal frequency division multiplexing (OFDM) is the modulation scheme of choice for digital video broadcasting-handheld (DVB-H) which is required to operate under high mobility conditions resulting in significant Inter-Carrier Interference (ICI). Under these conditions, the conventional one-tap per subcarrier channel estimation and equalization is suboptimal since it does not account for ICI effects. A hybrid frequency and time-domain channel estimation method was developed in [1] to mitigate the ICI due to time-variation within one OFDM symbol. We show that significant additional complexity reductions can be achieved by exploiting the special structure of the channel matrix over both the time and frequency domains. Our simulation results show that the proposed method has much less complexity with small performance loss under fast-varying channel conditions for DVB-H system.","PeriodicalId":293243,"journal":{"name":"2007 IEEE Sarnoff Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129350989","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
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