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2008 4th IEEE International Conference on Circuits and Systems for Communications最新文献

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Adaptive Delayed Channel Access for IEEE 802.11n WLANs IEEE 802.11n无线局域网的自适应延迟信道接入
2008 4th IEEE International Conference on Circuits and Systems for Communications Pub Date : 2008-05-26 DOI: 10.1109/ICCSC.2008.42
Dionysios Skordoulis, Q. Ni, G. Min, Kevin Borg
{"title":"Adaptive Delayed Channel Access for IEEE 802.11n WLANs","authors":"Dionysios Skordoulis, Q. Ni, G. Min, Kevin Borg","doi":"10.1109/ICCSC.2008.42","DOIUrl":"https://doi.org/10.1109/ICCSC.2008.42","url":null,"abstract":"In this paper we investigate potential benefits that an adaptive delayed channel access algorithm can attain for the next-generation wireless LANs, the IEEE 802.11n. We show that the performance of frame aggregation introduced by the 802.11n adheres due to the priority mechanism of the legacy 802.11e EDCA scheduler, resulting in a poor overall performance. Because high priority flows have low channel utilization, the low priority flows throughputs can be amerced further. By introducing an additional delay at the MAC layer, before the channel access scheduling, it will retain aggregate sizes at higher numbers and consequently a better channel utilization. Also, in order to support both UDP and TCP transport layer protocols, the algorithm's operational conditions are kept adaptive. The simulation results demonstrate that our proposed adaptive delayed channel access outperforms significantly the current 802.1 In specification and non-adaptive delayed channel access.","PeriodicalId":137660,"journal":{"name":"2008 4th IEEE International Conference on Circuits and Systems for Communications","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132473745","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: 18
Reducing Receive Buffer Blocking In Concurrent Multipath Transfer 减少并发多路径传输中的接收缓冲区阻塞
2008 4th IEEE International Conference on Circuits and Systems for Communications Pub Date : 2008-05-26 DOI: 10.1109/ICCSC.2008.85
Jiemin Liu, Hongxing Zou, Jingxin Dou, Yuan Gao
{"title":"Reducing Receive Buffer Blocking In Concurrent Multipath Transfer","authors":"Jiemin Liu, Hongxing Zou, Jingxin Dou, Yuan Gao","doi":"10.1109/ICCSC.2008.85","DOIUrl":"https://doi.org/10.1109/ICCSC.2008.85","url":null,"abstract":"Using the application of bluck data transfer, we investigate the performance of Concurrent Multipath Transfer using SCTP Multihoming (CMT) with existing five retransmission policy under the scenario of a sender is constrained by the receive buffer (rbuf). We find that all of retransmission policy has some defects in aspect of reducing receive buffer blocking. In order to further alleviate some of the throughput degradation caused by rbuf blocking problem, the combination of Congestion window, Slow start threshould and Lossrate(CSL) to be taked into account. Based on this, we present a suggestion called compound parameter Retransmission policy (i.e., Rtx-CSL policy) to further improve the goodput of infinite rbuf CMT association. We also discuss CMT performance using Rtx-CSL policy and constrained rbuf values of 32 KB, 64 KB, and 128 KB. A demonstrate using simulation is provided showing how rbuf blocking is reduced and overall throughput of an rbuf- constrained CMT association could benefit from Rtx-CSL policy.","PeriodicalId":137660,"journal":{"name":"2008 4th IEEE International Conference on Circuits and Systems for Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130246246","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: 19
Design of Differential Amplifier with Negative Impedance Compensation 负阻抗补偿差分放大器的设计
2008 4th IEEE International Conference on Circuits and Systems for Communications Pub Date : 2008-05-26 DOI: 10.1109/ICCSC.2008.131
R. Wu, R.F.J. Lidgey, K. Hayatleh, B. Hart
{"title":"Design of Differential Amplifier with Negative Impedance Compensation","authors":"R. Wu, R.F.J. Lidgey, K. Hayatleh, B. Hart","doi":"10.1109/ICCSC.2008.131","DOIUrl":"https://doi.org/10.1109/ICCSC.2008.131","url":null,"abstract":"Design of differential amplifier with high gain accuracy and high linearity is presented in the paper. The amplifier design is based on the negative impedance compensation technique reported by the authors in [1]. A negative impedance with high precision, low sensitivity, wide input signal range and simple structure is used for the compensation of differential amplifier. Analysis and simulation results show that gain accuracy and linearity can be improved significantly with the negative impedance compensation.","PeriodicalId":137660,"journal":{"name":"2008 4th IEEE International Conference on Circuits and Systems for Communications","volume":"19 13-14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133124301","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
Improvement of Date Rate by using Equalization in an Indoor Visible Light Communication System 利用均衡技术提高室内可见光通信系统的数据速率
2008 4th IEEE International Conference on Circuits and Systems for Communications Pub Date : 2008-05-26 DOI: 10.1109/ICCSC.2008.149
L. Zeng, D. O’brien, H. Le‐Minh, Kyungwoo Lee, D. Jung, Y. Oh
{"title":"Improvement of Date Rate by using Equalization in an Indoor Visible Light Communication System","authors":"L. Zeng, D. O’brien, H. Le‐Minh, Kyungwoo Lee, D. Jung, Y. Oh","doi":"10.1109/ICCSC.2008.149","DOIUrl":"https://doi.org/10.1109/ICCSC.2008.149","url":null,"abstract":"In this paper, an optical wireless communication system that uses white LEDs is described. Equalization is employed at the receiver to improve the data rate. Simulation shows a highly reliable communication channel with an SNR of up to 81 dB. Moreover, the data rate can be improved from 16 Mb/s to 32 Mb/s NRZ-OOK at a BER of 10-6.","PeriodicalId":137660,"journal":{"name":"2008 4th IEEE International Conference on Circuits and Systems for Communications","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133142503","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: 150
A Joint Power Control Scheme with Game Theory, Waveform Adaptation and Multiuser Detection 一种结合博弈论、波形自适应和多用户检测的联合功率控制方案
2008 4th IEEE International Conference on Circuits and Systems for Communications Pub Date : 2008-05-26 DOI: 10.1109/ICCSC.2008.144
G. Kang, Xinnan Fan, Changping Zhu
{"title":"A Joint Power Control Scheme with Game Theory, Waveform Adaptation and Multiuser Detection","authors":"G. Kang, Xinnan Fan, Changping Zhu","doi":"10.1109/ICCSC.2008.144","DOIUrl":"https://doi.org/10.1109/ICCSC.2008.144","url":null,"abstract":"In the paper, we combine waveform adaptation with multi-user detection to propose a new game-theoretic power control algorithm, which both the transmitter signature waveforms and receiver filter coefficients for all users are sequentially updated in a distributed way. We show that the proposed algorithm converges to a fixed-point power vector where the information rate for each of the users is maximized, the transmitter signature waveforms converge to be orthogonal waveforms that the interferences between users are minimized and the receiver filter converges to the minimum mean squared error (MMSE) multiuser detector. Moreover, the simulation results show that the new power control scheme outperforms the game model in [4] in terms of the maximum of SINR or the net information rate obtained on condition that total transmitted power is given.","PeriodicalId":137660,"journal":{"name":"2008 4th IEEE International Conference on Circuits and Systems for Communications","volume":"56 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124537419","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
Accelerated Flexible Co-Processor Architecture for Crypto Information 用于加密信息的加速灵活协处理器架构
2008 4th IEEE International Conference on Circuits and Systems for Communications Pub Date : 2008-05-26 DOI: 10.1109/ICCSC.2008.139
Z. Dai, Xuerong Yu, Jinhai Su, X. Chen
{"title":"Accelerated Flexible Co-Processor Architecture for Crypto Information","authors":"Z. Dai, Xuerong Yu, Jinhai Su, X. Chen","doi":"10.1109/ICCSC.2008.139","DOIUrl":"https://doi.org/10.1109/ICCSC.2008.139","url":null,"abstract":"The paper presented a core of AFPC (Accelerated Flexible Co-Processor Architecture for Crypto Information) architecture which was developed with respect to speed and flexibility of crypto information, including symmetric-key cipher algorithms and Hash functions. As to crypto units, we adopt a specific design which is reconfigurable. At the mean time, a set of new VLIW instructions that improve the efficiency of the analyzed algorithms are introduced. A number of algorithms were implemented on an architectural simulator and dedicated parts of the architecture were realized using Verilog to measure hardware parameters. Finally, in synthesis, the design is fabricated on 0.18um CMOS cells through Design Compiler tool, and the performance of this co-processor is compared with other hardware/software implementation. The results prove that AFPC can achieve relatively high performance in cipher algorithms processing.","PeriodicalId":137660,"journal":{"name":"2008 4th IEEE International Conference on Circuits and Systems for Communications","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115106524","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 Low-Complexity Carrier Frequency Offset Estimator for OFDM System with Virtual Subcarriers 基于虚拟子载波OFDM系统的低复杂度载波频偏估计
2008 4th IEEE International Conference on Circuits and Systems for Communications Pub Date : 2008-05-26 DOI: 10.1109/ICCSC.2008.11
Feng Xinxin, S. Feng
{"title":"A Low-Complexity Carrier Frequency Offset Estimator for OFDM System with Virtual Subcarriers","authors":"Feng Xinxin, S. Feng","doi":"10.1109/ICCSC.2008.11","DOIUrl":"https://doi.org/10.1109/ICCSC.2008.11","url":null,"abstract":"A maximum likelihood (ML) estimator of carrier frequency offset (CFO) based on virtual carriers is firstly proposed in [1]. Its main disadvantage is large computational amount. By IFFT and piecewise searching techniques, its complexity is significantly reduced. Simulation results in AWGN and Typical Urban (TU) channels show that the simplified ML estimator has low complexity and achieves the same performance as the original one.","PeriodicalId":137660,"journal":{"name":"2008 4th IEEE International Conference on Circuits and Systems for Communications","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125826448","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
Precoder Design for the Downlink of Multi-User MIMO Systems with Multiple Antenna Receiver 多天线多用户MIMO系统下行预编码器设计
2008 4th IEEE International Conference on Circuits and Systems for Communications Pub Date : 2008-05-26 DOI: 10.1109/ICCSC.2008.34
Wei Wang, Meixia Hu, Hailin Zhang
{"title":"Precoder Design for the Downlink of Multi-User MIMO Systems with Multiple Antenna Receiver","authors":"Wei Wang, Meixia Hu, Hailin Zhang","doi":"10.1109/ICCSC.2008.34","DOIUrl":"https://doi.org/10.1109/ICCSC.2008.34","url":null,"abstract":"The paper considers precoder design for the downlink of multi-user MIMO systems where antenna array are used at both the base station and the mobile receiver. The proposed precoder does not completely eliminate multi-user interference (MUI) as previous schemes with multiple receive antennas per user, but obtains an optimum compromise between noise enhancement and MUI mitigation. Furthermore, by extracting diversity from each user's subspace and reducing precoding loss, the proposed scheme can offer a significant gain in term of average bit error rate (BER).","PeriodicalId":137660,"journal":{"name":"2008 4th IEEE International Conference on Circuits and Systems for Communications","volume":"8 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129480238","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
Symmetric Path Selection in IEEE 802.16 Multi-Hop Relay Networks with Error Prone Links 具有易出错链路的IEEE 802.16多跳中继网络中的对称路径选择
2008 4th IEEE International Conference on Circuits and Systems for Communications Pub Date : 2008-05-26 DOI: 10.1109/ICCSC.2008.176
Sheng-Shih Wang, Hua-Chiang Yin, Shiann-Tsong Sheu
{"title":"Symmetric Path Selection in IEEE 802.16 Multi-Hop Relay Networks with Error Prone Links","authors":"Sheng-Shih Wang, Hua-Chiang Yin, Shiann-Tsong Sheu","doi":"10.1109/ICCSC.2008.176","DOIUrl":"https://doi.org/10.1109/ICCSC.2008.176","url":null,"abstract":"Recently, the IEEE 802.16j task group has focused on the development of a novel network architecture with the aid of relaying technique for range extension, coverage extension and throughput enhancement. Our prior research, to select an optimal path in the IEEE 802.16 multi-hop relay (MR) network, proposes a novel metric, called ERRI, which indicates the effectiveness of radio resource of a link used to transmit data. Under the consideration of error-prone links due to unreliable channel conditions, the paper, on the basis of our previous work, models an error-prone MR network as a finite-state Markov chain, and then develops a new path cost function for symmetric path selection. Simulation results show that the relay path selection scheme with modified ERRI considerations significantly achieves throughput gains in the error-prone IEEE 802.16 MR network.","PeriodicalId":137660,"journal":{"name":"2008 4th IEEE International Conference on Circuits and Systems for Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129883386","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: 8
OFDM-CPM BER Performance in SUI Multipath Channels SUI多径信道中的OFDM-CPM误码率性能
2008 4th IEEE International Conference on Circuits and Systems for Communications Pub Date : 2008-05-26 DOI: 10.1109/ICCSC.2008.191
V. T. Vakily, A. Montazeri
{"title":"OFDM-CPM BER Performance in SUI Multipath Channels","authors":"V. T. Vakily, A. Montazeri","doi":"10.1109/ICCSC.2008.191","DOIUrl":"https://doi.org/10.1109/ICCSC.2008.191","url":null,"abstract":"This paper presents the application of Orthogonal frequency domain modulation-Continuous Phase Modulation (OFDM-CPM) in multipath Standard University Interim (SUI) channels. It is shown that, in addition to OdB Peak to Average Power Ratio (PAPR) and power efficiency, uncoded OFDM-CPM exploits the frequency diversity of multipath channel. Taking into account the Input Power Backoff (IBO), OFDM-CPM is shown to outperform OFDM at high bit energy-to-noise density ratios (Eb/N0). However, at low Signal to Noise Ratio (SNR), the OFDM-CPM phase demodulator receiver suffers from a threshold effect. Simulation results in SUI channels confirm the analysis.","PeriodicalId":137660,"journal":{"name":"2008 4th IEEE International Conference on Circuits and Systems for Communications","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127486647","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
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