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A spectrally overlaid flexible bandwidth utilization scheme for cellular CDMA systems 一种用于蜂窝CDMA系统的频谱覆盖灵活带宽利用方案
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359338
G. Sivaradje, P. Dananjayan
{"title":"A spectrally overlaid flexible bandwidth utilization scheme for cellular CDMA systems","authors":"G. Sivaradje, P. Dananjayan","doi":"10.1109/ICCS.2004.1359338","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359338","url":null,"abstract":"Future wireless communication systems need to utilize bandwidth very efficiently in order to manage the ever-growing traffic conditions. The capacity of a link can be improved by spectrally overlaying narrowband subsystems over a single wideband subsystem. A micro/macro cellular CDMA overlay system is considered. The important issues such as the interference and the desired user signal power in the reverse link, the system, parameters affecting the reverse link capacity, the spectral overlay ratio and distance between microcells and macrocells base stations are analyzed. The relative power used, the interference obtained due to the neighbouring cells and maximum total throughput in a particular cell have been analyzed. A real time simulation of a CDMA system in a cellular environment consisting of several narrowbands overlaid on a wideband system is carried out which clearly shows the capacity tradeoffs between the narrowband and wideband CDMA systems","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134226826","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
An efficient scheduling algorithm for real-time traffic on WDm optical networks 一种有效的WDm光网络实时流量调度算法
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359400
Xiaohong Huang, M. Ma
{"title":"An efficient scheduling algorithm for real-time traffic on WDm optical networks","authors":"Xiaohong Huang, M. Ma","doi":"10.1109/ICCS.2004.1359400","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359400","url":null,"abstract":"One of the major challenges in the design of future generation high-speed networks is the provision of quality-of-service (QoS) to real-time traffic. In this paper, we propose a novel scheduling scheme, namely differentiated dropping scheduling (DDS), which is designed to handle real-time traffic in passive star-coupled WDM optical networks. By taking channel availability and destination availability into account, DDS can dramatically improve the network performance in terms of message loss rate. In order to evaluate the proposed algorithm DDS, extensive discrete-event simulations are conducted by comparing its performance with Moore and Hodgson's algorithm and earliest due date (EDD) algorithm. The results show that DDS can achieve best performance among the three algorithms","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"238 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134261775","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
Performance of MC-CDMA systems with space-time block codes in frequency selective fading channels 空时分组码MC-CDMA系统在频率选择性衰落信道中的性能
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359457
M. Valipour, H. Shafiee
{"title":"Performance of MC-CDMA systems with space-time block codes in frequency selective fading channels","authors":"M. Valipour, H. Shafiee","doi":"10.1109/ICCS.2004.1359457","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359457","url":null,"abstract":"In this paper, the performance of a space time coded multi-user MC-CDMA wireless communication system in frequency selective fading channels is analyzed. The space time code is a block code with a 4times4 transition matrix. Analytical and simulation symbol error rate results are obtained for the system with two transmit antennas. The analysis also shows that a more relaxed set of orthogonality conditions is sufficient for the spreading sequences","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131151925","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
Algorithms for wavelength division multiplexed translucent optical networks 波分复用半透明光网络算法
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359399
Y. Ye, T. Chai, T. Cheng, Chao Lu
{"title":"Algorithms for wavelength division multiplexed translucent optical networks","authors":"Y. Ye, T. Chai, T. Cheng, Chao Lu","doi":"10.1109/ICCS.2004.1359399","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359399","url":null,"abstract":"In order to establish lightpaths in the dynamic wavelength division multiplexed translucent optical networks, we propose an adaptive routing algorithm, which selects K edge-disjoint paths based on the network state, then chooses one route from the K alternatives considering not only the number of free wavelengths and the length of the route, but also the free transceivers in the nodes. An auxiliary graph is used to assign the wavelengths and locate the nodes for wavelength conversion or regeneration, after a route has been selected. Through extensive simulation using some commonly used network models, we show that the proposed routing and wavelength assignment algorithm can achieve better blocking performance than other algorithms","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124406865","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: 6
Concaved suspended plate antenna with low cross-polarization level 低交叉极化水平的凹悬板天线
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359448
Kai Meng Poon, Zhi Ning Chen, X. Qing
{"title":"Concaved suspended plate antenna with low cross-polarization level","authors":"Kai Meng Poon, Zhi Ning Chen, X. Qing","doi":"10.1109/ICCS.2004.1359448","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359448","url":null,"abstract":"This paper presents experimental study on a concaved suspended plate antenna with low cross-polarization radiating levels for broadband applications. The antenna is fabricated to form a structure with a concave at the center section of the raised radiating plate. Experimental measurements show that the antenna achieves large impedance bandwidths up to 55% for VSWR < 2:1. Through the dual probe-fed technique, the high cross-polarization radiation levels of the antenna are suppressed with a reduction in the peak level of nearly 10 dB","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120840086","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
Single channel speech enhancement using temporal masking 使用时间掩蔽的单通道语音增强
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359377
T. Gunawan, E. Ambikairajah
{"title":"Single channel speech enhancement using temporal masking","authors":"T. Gunawan, E. Ambikairajah","doi":"10.1109/ICCS.2004.1359377","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359377","url":null,"abstract":"A novel speech enhancement technique is presented based on the temporal masking properties of the human auditory system. The input signal is divided into a number of sub-bands that are individually and adaptively weighted in the time domain according to a short term SNR estimate in each sub-band. The short time SNR estimate is calculated using the temporal masking thresholds in each sub-band. Objective measures and informal listening tests demonstrated significant improvements over other methods when tested with speech signals corrupted by car noise for SNR values of 0, 10, and 20 dB","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"132 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120988796","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
Effective control for ABR multipoint-to-multipoint services 有效控制ABR多点对多点业务
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359430
U. T. Nguyen
{"title":"Effective control for ABR multipoint-to-multipoint services","authors":"U. T. Nguyen","doi":"10.1109/ICCS.2004.1359430","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359430","url":null,"abstract":"Although many flow control schemes have been proposed for ABR (available bit rate) multipoint-to-multipoint (mp-mp) services in ATM (asynchronous transfer mode) networks, several issues remain to be resolved: bandwidth allocation definitions (BADs), and the effectiveness of those schemes. No consensus has been reached concerning the issue of criteria for allocating ABR bandwidth among multipoint connections, or between point-to-point and multipoint connections. On the other hand, existing mp-mp flow control schemes implement only one BAD, namely source-based allocation. This inflexibility can limit the application of those schemes. Moreover, our simulation results show that they suffer from the problems of link under-utilization and/or noncompliance with the selected BAD. We propose a mp-mp flow control algorithm, the FCAM algorithm, that supports a large set of BADs, provides correct rate allocations with fast convergence, and maximizes link utilization. Experimental results are presented to demonstrate the above advantages of the FCAM algorithm","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124654001","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
Novel parity-check code and post-processor for perpendicular recording channels 新颖的垂直记录信道奇偶校验码和后处理器
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359426
M. Elidrissi, G. Mathew
{"title":"Novel parity-check code and post-processor for perpendicular recording channels","authors":"M. Elidrissi, G. Mathew","doi":"10.1109/ICCS.2004.1359426","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359426","url":null,"abstract":"A novel constrained parity-check code with post-processing is presented in this paper for improving the bit error rate performance on perpendicular recording channels. The particular design of the parity-check code results in a post-processor, that is computationally much simpler than conventional post-processors. We also examine the optimality of the post-processors used in current systems. The proposed constrained parity-check code results in about 4.2 dB coding gain, as seen from our analytical and simulation studies","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127249875","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
Optically tuning spiral inductor for RF applications 用于射频应用的光调谐螺旋电感器
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359440
N. Rao, A. Chandorkar
{"title":"Optically tuning spiral inductor for RF applications","authors":"N. Rao, A. Chandorkar","doi":"10.1109/ICCS.2004.1359440","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359440","url":null,"abstract":"The inductors are found in impedance matching networks, filters, tuned amplifiers and voltage controlled oscillators. The performance of these circuits heavily depends on these passive components. Many researchers are working are improving the performance of passive components in particular inductors. A novel method of implementing the tunability in inductor is proposed. Tunability in this passive component gives better performance of RF front end circuits by adjusting the centre frequency of band pass filter. This work is based on improving the mutual impedance by increasing the length of the additional conductor without effecting the overall spiral length by optical switching. This method does not increase the resistance of the spiral inductor as we are not increasing the physical length of the spiral, but we are increasing the coupling","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114174808","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
Joint compression and tracking of frequency offsets in RF mixers and DAC/ADC clocks in OFDM 联合压缩和跟踪频率偏移在射频混频器和DAC/ADC时钟在OFDM
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359357
H. Shafiee, B. Nourani, M. Khoshgard
{"title":"Joint compression and tracking of frequency offsets in RF mixers and DAC/ADC clocks in OFDM","authors":"H. Shafiee, B. Nourani, M. Khoshgard","doi":"10.1109/ICCS.2004.1359357","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359357","url":null,"abstract":"The performance of an OFDM communication system is severely affected by two types of frequency offsets. One is the difference between the frequency of the local oscillator (LO) and the received signal carrier frequency. The other is the frequency offset in the clocks of DAC's and ADC's. The frequency offset in the receiver LO is usually acquired at the beginning of each packet and later tracked in the data demodulation mode. Methods for estimation and compensation of DAC/ADC clocks frequency offset by processing of sampled data also exist. In this paper, we present an algorithm for joint tracking and compensation of the two frequency offset phenomena. Simulation results show that the algorithm works quite effectively even in the presence of large amount of offsets","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124390141","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
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