2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)最新文献_第10页

Improving QPSK demodulator performance for quadrature receiver with information from amplitude and phase imbalance correction 利用幅相不平衡校正信息改善正交接收机QPSK解调性能

2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.904844

Hung H. Nguyen

引用次数: 6

A novel QoS scheme for handoffs in wireless IP networks 一种新的无线IP网络切换QoS方案

2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.903902

T. Janevski, B. Spasenovski

引用次数: 6

Energy aware sampling schemes 节能抽样方案

2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.903971

P. Nuggehalli, V. Srinivasan, Kameswari Chebrolu, R. Rao

引用次数: 3

Scene adaptive multiple coding scheme for robust image transmission 鲁棒图像传输的场景自适应多重编码方案

2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.904802

Lei Cao, C. Chen

{"title":"Scene adaptive multiple coding scheme for robust image transmission","authors":"Lei Cao, C. Chen","doi":"10.1109/WCNC.2000.904802","DOIUrl":"https://doi.org/10.1109/WCNC.2000.904802","url":null,"abstract":"We propose a combined source and channel coding scheme for image transmission over noisy channels. The key component is extracting and preserving the scene information and incorporating it with unequal error protection to combat the channel errors. After hierarchical wavelet decomposition of the image, wavelet coefficients with a parent-child relationship are grouped into wavelet blocks and classified according to corresponding scenes in the original image. For each class, spatial neighborhood coefficients in the high frequency subbands are constrained so that the spatially isolated coefficients are removed and clustered coefficients are retained at the same time. All the wavelet blocks in the same class are grouped together and coded using the set partitioning in hierarchical trees (SPIHT) algorithm. High source coding efficiency is preserved even though multiple source coded bitstreams are generated since the wavelet tree structure is intact. In order to combat the channel errors, an unequal error protection strategy implemented by RCPC/CRC channel coding is designed based on the bit contribution to both PSNR and human visual sensitivity. Finally, a postprocessing method is developed at the receiving end to restore the degradation due to the residual error after channel decoding. Experimental results show that the proposed scheme is indeed able to provide protection for more important bits and more important visual content under a noisy transmission environment. In particular, the reconstructed images illustrate consistently better visual quality.","PeriodicalId":404304,"journal":{"name":"2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122170965","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 dual-hybrid adaptive routing strategy for wireless ad-hoc networks 无线自组织网络的双混合自适应路由策略

2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.904786

A. B. McDonald, T. Znati

{"title":"A dual-hybrid adaptive routing strategy for wireless ad-hoc networks","authors":"A. B. McDonald, T. Znati","doi":"10.1109/WCNC.2000.904786","DOIUrl":"https://doi.org/10.1109/WCNC.2000.904786","url":null,"abstract":"Recent debate in the research community has focused around the following question: should the design of routing algorithms for ad-hoc networks be predicated upon the minimization of routing overhead, or the optimization of network paths? The answer to this question depends upon the mobility and traffic characteristics present in the network. It is doubtful that any one approach by itself can be optimal, or even sufficient when there are temporal and spatial changes in the network dynamics. Most proposed solutions have adopted a fixed approach. To address this shortcoming we propose a dynamic cluster based routing strategy that shifts the characteristics of its routing approach according to localized network dynamics. This is achieved by dividing routing into intra-cluster and inter-cluster components utilizing a strategy that is hybrid in terms of both its route acquisition and path computation approaches. By adapting the cluster organization to node mobility the strategy senses the network and balances optimality and overhead. The reason for doing this is to achieve the best possible performance subject to a wide range of operating environments.","PeriodicalId":404304,"journal":{"name":"2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125773283","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

Modified CRLB on the modulation parameters of OQPSK signal and MSK signal 改进了对OQPSK信号和MSK信号调制参数的CRLB

2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.904863

L. Hong, K. C. Ho

{"title":"Modified CRLB on the modulation parameters of OQPSK signal and MSK signal","authors":"L. Hong, K. C. Ho","doi":"10.1109/WCNC.2000.904863","DOIUrl":"https://doi.org/10.1109/WCNC.2000.904863","url":null,"abstract":"When the characteristics of a digitally modulated signal are unknown, the estimation of its modulation parameters is indispensable for many digital communication applications. It is therefore very useful to establish a lower bound on the parameter estimation accuracy of a modulated signal. This paper presents the modified Cramer-Rao lower bound (MCRLB) for the modulation parameters of an offset quadrature phase shift keying (OQPSK) signal and that of a minimum shift keying (MSK) signal embedded in additive white Gaussian noise (AWGN). The modulation parameters considered are the carrier frequency f/sub c/, the carrier phase /spl theta//sub c/, the signal amplitude A and the symbol time T/sub s/. The MCRLB is dependent on the observation time, the modulation parameters and the pulse shaping function. The MCRLB is evaluated with the raised cosine and lowpass pulse shaping functions. When the roll-off factor of the raised cosine filter increases, the MCRLBs of the four parameters increase, regardless of whatever the modulation type is. In addition, the MCRLB on the T/sub s/ of a MSK signal is 3 dB lower than that of an OQPSK signal. When the bandwidth of the lowpass filter increases, the MCRLBs on f/sub c/, /spl theta//sub c/ and A of an OQPSK signal increases, but the MCRLB on the T/sub s/ of an OQPSK signal decreases. On the other hand, the MCRLBs on the modulation parameters of the a MSK signal all increase.","PeriodicalId":404304,"journal":{"name":"2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)","volume":"514 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123424271","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

Forward-link CDMA resource allocation based on pricing 基于定价的前向链路CDMA资源分配

2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.904838

Peijuan Liu, M. Honig, S. Jordan

引用次数: 48

Receive diversity for mobile OFDM systems 接收分集的移动OFDM系统

2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.903941

A. Hutter, J. Hammerschmidt, E. Carvalho, J. Cioffi

引用次数: 40

Soft decoding techniques for broadband wireless channels 宽带无线信道软解码技术

2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.904874

M. Ran, J. Liebetreu, Mohammad Akhter

引用次数: 0

Asymptotically optimal CDMA receiver: perfect MAI cancellation 渐近最优CDMA接收机:完美的MAI取消

2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540) Pub Date : 2000-09-23 DOI: 10.1109/WCNC.2000.904856

Zhengyuan Xu

引用次数: 2