Pub Date : 2010-11-11DOI: 10.1109/WCSP.2010.5633459
Y. Dandach, P. Siohan
Contrary to multicarrier modulation (MCM), single carrier (SC) can provide low peak to average power ratios (PAPRs). Thus, they have been proposed for various mobile systems, e.g. for the GSM and for the 3GPP-LTE. In this paper, we use the link with a MCM system to introduce a SC transceiver based on the Offset Quadrature Amplitude Modulation (OQAM). We show that, for certain systems, OQAM can provide simultaneously orthogonality and phase linearity properties that cannot be reached by conventional QAM schemes. Furthermore, we get improvements with respect to the power ratio (PR).
{"title":"Pulse-shaped offset QAM in discrete-time","authors":"Y. Dandach, P. Siohan","doi":"10.1109/WCSP.2010.5633459","DOIUrl":"https://doi.org/10.1109/WCSP.2010.5633459","url":null,"abstract":"Contrary to multicarrier modulation (MCM), single carrier (SC) can provide low peak to average power ratios (PAPRs). Thus, they have been proposed for various mobile systems, e.g. for the GSM and for the 3GPP-LTE. In this paper, we use the link with a MCM system to introduce a SC transceiver based on the Offset Quadrature Amplitude Modulation (OQAM). We show that, for certain systems, OQAM can provide simultaneously orthogonality and phase linearity properties that cannot be reached by conventional QAM schemes. Furthermore, we get improvements with respect to the power ratio (PR).","PeriodicalId":448094,"journal":{"name":"2010 International Conference on Wireless Communications & Signal Processing (WCSP)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127553204","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}
Pub Date : 2010-11-11DOI: 10.1109/WCSP.2010.5633538
Bin Zhou, Xiongwei Zhang, Xia Zou
An improved wavelet-based speech enhancement method using adaptive block thresholding is proposed. Adaptive block thresholding is introduced by G. Yu [1] to eliminate the musical noise artifacts, but the performance for unvoiced speech is not satisfactory. To solve this problem, a voiced/unvoiced decision is applied and a small block size is set for unvoiced speech. Furthermore, the thresholding is adjusted considering both the intrascale and interscale dependencies of wavelet coefficients. The experimental results show that the improved method can obtain better denoising performance than the method proposed by G. Yu, especially for unvoiced speech.
{"title":"An improved wavelet-based speech enhancement method using adaptive block thresholding","authors":"Bin Zhou, Xiongwei Zhang, Xia Zou","doi":"10.1109/WCSP.2010.5633538","DOIUrl":"https://doi.org/10.1109/WCSP.2010.5633538","url":null,"abstract":"An improved wavelet-based speech enhancement method using adaptive block thresholding is proposed. Adaptive block thresholding is introduced by G. Yu [1] to eliminate the musical noise artifacts, but the performance for unvoiced speech is not satisfactory. To solve this problem, a voiced/unvoiced decision is applied and a small block size is set for unvoiced speech. Furthermore, the thresholding is adjusted considering both the intrascale and interscale dependencies of wavelet coefficients. The experimental results show that the improved method can obtain better denoising performance than the method proposed by G. Yu, especially for unvoiced speech.","PeriodicalId":448094,"journal":{"name":"2010 International Conference on Wireless Communications & Signal Processing (WCSP)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126896191","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}
Pub Date : 2010-11-11DOI: 10.1109/WCSP.2010.5633848
Yongjun Li, Hu Chen, Rongchuan He, Rong Xie, Shaocong Zou
Data collection is one of the basic tasks of WSN, and data collection protocol occupies a pivotal position in WSN. Data collection protocol in TinyOS 2.0 is implemented in the form of Collection Tree Protocol (CTP). However, CTP have proved to be extremely efficient [1], in practical applications, CTP also have some disadvantages. The paper presents an improved data collection protocol ICTP based on the analysis of CTP. The protocol introduces the concept of load balance into CTP. Finally, with the simulation results, we have proved that our improvement improves the efficiency and performance of the data collection task in WSN. There is something noteworthy that ICPT doesn't have additional energy as a result of not selecting the optimal path.
数据采集是无线传感器网络的基本任务之一，而数据采集协议在无线传感器网络中占有举足轻重的地位。TinyOS 2.0中的数据采集协议以CTP (collection Tree protocol)的形式实现。然而，CTP已被证明是非常高效的[1]，在实际应用中，CTP也有一些缺点。本文在分析CTP协议的基础上，提出了一种改进的数据采集协议ICTP。该协议在CTP中引入了负载平衡的概念。最后，通过仿真结果，我们证明了我们的改进提高了WSN中数据采集任务的效率和性能。值得注意的是，由于没有选择最优路径，ICPT没有额外的能量。
{"title":"ICTP: An improved data collection protocol based OnCTP","authors":"Yongjun Li, Hu Chen, Rongchuan He, Rong Xie, Shaocong Zou","doi":"10.1109/WCSP.2010.5633848","DOIUrl":"https://doi.org/10.1109/WCSP.2010.5633848","url":null,"abstract":"Data collection is one of the basic tasks of WSN, and data collection protocol occupies a pivotal position in WSN. Data collection protocol in TinyOS 2.0 is implemented in the form of Collection Tree Protocol (CTP). However, CTP have proved to be extremely efficient [1], in practical applications, CTP also have some disadvantages. The paper presents an improved data collection protocol ICTP based on the analysis of CTP. The protocol introduces the concept of load balance into CTP. Finally, with the simulation results, we have proved that our improvement improves the efficiency and performance of the data collection task in WSN. There is something noteworthy that ICPT doesn't have additional energy as a result of not selecting the optimal path.","PeriodicalId":448094,"journal":{"name":"2010 International Conference on Wireless Communications & Signal Processing (WCSP)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125197492","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}
Pub Date : 2010-11-11DOI: 10.1109/WCSP.2010.5633821
Xuyu Wang, Xinbo Gao, R. Zong, Peng Cheng
In future communication system, the demand for high capacity is a challenging problem for wireless services, especially for delivery of the 'last mile'. A potential solution is offered by the high altitude platforms (HAPs), which can utilize the best character and tradeoff of both satellite and terrestrial networks. Since the performance of the HAPs depends on the structure of network, how to deploy the nodes of airships for HAPs is increasingly important. In this paper, an optimal model of deployment of airships for HAPs is constructed and solved based on genetic algorithm. First, a heterogeneous system including terrestrial layer, HAP layer and GEO layer is given. Then, an optimal model with objective function of maximum entropy and minimum delay is established to optimize the deployment of airships for HAPs. Finally, a modified genetic algorithm (GA) is employed to optimize the objective function and get the optimal solution to the model. Simulation results show that the established objective function and the solution based on GA can reach the goal of on-demand deployment of airship for HAPs.
{"title":"An optimal model and solution of deployment of airships for high altitude platforms","authors":"Xuyu Wang, Xinbo Gao, R. Zong, Peng Cheng","doi":"10.1109/WCSP.2010.5633821","DOIUrl":"https://doi.org/10.1109/WCSP.2010.5633821","url":null,"abstract":"In future communication system, the demand for high capacity is a challenging problem for wireless services, especially for delivery of the 'last mile'. A potential solution is offered by the high altitude platforms (HAPs), which can utilize the best character and tradeoff of both satellite and terrestrial networks. Since the performance of the HAPs depends on the structure of network, how to deploy the nodes of airships for HAPs is increasingly important. In this paper, an optimal model of deployment of airships for HAPs is constructed and solved based on genetic algorithm. First, a heterogeneous system including terrestrial layer, HAP layer and GEO layer is given. Then, an optimal model with objective function of maximum entropy and minimum delay is established to optimize the deployment of airships for HAPs. Finally, a modified genetic algorithm (GA) is employed to optimize the objective function and get the optimal solution to the model. Simulation results show that the established objective function and the solution based on GA can reach the goal of on-demand deployment of airship for HAPs.","PeriodicalId":448094,"journal":{"name":"2010 International Conference on Wireless Communications & Signal Processing (WCSP)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124462559","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}
Pub Date : 2010-11-11DOI: 10.1109/WCSP.2010.5633445
Xu Li, Yanli Deng, V. Narasimhan, A. Nayak, I. Stojmenovic
We propose a localized address autoconfiguration (LaConf) scheme for wireless ad hoc networks. Address allocation information is maintained on the network border nodes, called addressing agents (AAs), which are locally identified by geographic routing protocol GFG [2]. When a node joins the network, it acquires an address from a neighboring AA (if any exists) by local communication or from the head AA (a geographic extreme AA) by GFG-based multi-hop communication. Geographic Hash Table (GHT) [19] is adopted for duplicate address detection. Each address is hashed to a unique location in the network field, and the associated assignment information is stored along the face perimeter enclosing that location (in the planar graph used). When a node receives an address assignment, it consults with the perimeter nodes around the hash location of the assigned address about any conflict. AAs detect network partition and merger locally according to neighborhood change and trigger AA re-selection and network re-configuration (if necessary). We evaluate LaConf through simulation using different planar graphs. We also propose to apply connected dominating set (CDS) [3] concept to improve the performance.
{"title":"Localized address autoconfiguration in wireless ad hoc networks","authors":"Xu Li, Yanli Deng, V. Narasimhan, A. Nayak, I. Stojmenovic","doi":"10.1109/WCSP.2010.5633445","DOIUrl":"https://doi.org/10.1109/WCSP.2010.5633445","url":null,"abstract":"We propose a localized address autoconfiguration (LaConf) scheme for wireless ad hoc networks. Address allocation information is maintained on the network border nodes, called addressing agents (AAs), which are locally identified by geographic routing protocol GFG [2]. When a node joins the network, it acquires an address from a neighboring AA (if any exists) by local communication or from the head AA (a geographic extreme AA) by GFG-based multi-hop communication. Geographic Hash Table (GHT) [19] is adopted for duplicate address detection. Each address is hashed to a unique location in the network field, and the associated assignment information is stored along the face perimeter enclosing that location (in the planar graph used). When a node receives an address assignment, it consults with the perimeter nodes around the hash location of the assigned address about any conflict. AAs detect network partition and merger locally according to neighborhood change and trigger AA re-selection and network re-configuration (if necessary). We evaluate LaConf through simulation using different planar graphs. We also propose to apply connected dominating set (CDS) [3] concept to improve the performance.","PeriodicalId":448094,"journal":{"name":"2010 International Conference on Wireless Communications & Signal Processing (WCSP)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122696420","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}
Pub Date : 2010-11-11DOI: 10.1109/WCSP.2010.5633558
Zhili Zhang, Hongwen Yang, Liyun Dai
In this paper, we propose a new relay assisted Hybird-ARQ scheme where the two transmitting nodes (source and relay) and the two received signals (from first transmission and retransmission) are viewed as a virtual MIMO and thus the source can send new codeword when the relay is retransmitting the old codeword. Moreover, to take advantage of time varying channel conditions, the retransmission of relay can be scheduled to a time slot with better channel condition. Simulation results show that the proposed method can improve the retransmission efficiency significantly.
{"title":"A new relay assisted Hybrid ARQ scheme","authors":"Zhili Zhang, Hongwen Yang, Liyun Dai","doi":"10.1109/WCSP.2010.5633558","DOIUrl":"https://doi.org/10.1109/WCSP.2010.5633558","url":null,"abstract":"In this paper, we propose a new relay assisted Hybird-ARQ scheme where the two transmitting nodes (source and relay) and the two received signals (from first transmission and retransmission) are viewed as a virtual MIMO and thus the source can send new codeword when the relay is retransmitting the old codeword. Moreover, to take advantage of time varying channel conditions, the retransmission of relay can be scheduled to a time slot with better channel condition. Simulation results show that the proposed method can improve the retransmission efficiency significantly.","PeriodicalId":448094,"journal":{"name":"2010 International Conference on Wireless Communications & Signal Processing (WCSP)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123505130","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}
Pub Date : 2010-11-11DOI: 10.1109/WCSP.2010.5633797
M. Reddy, B. Narasimha, E. Suresh, K. S. Rao
Eye ball movements are vital signs in some of the neurological disorders and it can be tracked by acquiring electrooculogram (EOG) signals. EOG is an obtrusive, inexpensive and non-invasive means of recording eye ball movements. The source for EOG signal is cornea-retinal potential (CRP) and is generated due to the movements of eye balls within the conductive environment of the skull. While recording the EOG signal, it will be contaminated by electromyography (EMG) signal. As the EOG is a non stationary signal, the multi resolution analysis using wavelet decomposition offers the best solution to denoise the EOG signal. In this paper, the author proposed a new wavelet based method to detect eye ball moments from signal conditioned EOG. Comparative wavelet analysis is performed by considering different statistical measures. Test results reveal that the Symlet based method provides better efficacy in eliminating noise from EOG signals.
{"title":"Analysis of EOG signals using wavelet transform for detecting eye blinks","authors":"M. Reddy, B. Narasimha, E. Suresh, K. S. Rao","doi":"10.1109/WCSP.2010.5633797","DOIUrl":"https://doi.org/10.1109/WCSP.2010.5633797","url":null,"abstract":"Eye ball movements are vital signs in some of the neurological disorders and it can be tracked by acquiring electrooculogram (EOG) signals. EOG is an obtrusive, inexpensive and non-invasive means of recording eye ball movements. The source for EOG signal is cornea-retinal potential (CRP) and is generated due to the movements of eye balls within the conductive environment of the skull. While recording the EOG signal, it will be contaminated by electromyography (EMG) signal. As the EOG is a non stationary signal, the multi resolution analysis using wavelet decomposition offers the best solution to denoise the EOG signal. In this paper, the author proposed a new wavelet based method to detect eye ball moments from signal conditioned EOG. Comparative wavelet analysis is performed by considering different statistical measures. Test results reveal that the Symlet based method provides better efficacy in eliminating noise from EOG signals.","PeriodicalId":448094,"journal":{"name":"2010 International Conference on Wireless Communications & Signal Processing (WCSP)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130398288","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}
Pub Date : 2010-11-11DOI: 10.1109/WCSP.2010.5633543
Y. Ozaki, Jun Ozawa, Eddy Taillefer, Jun Cheng, Y. Watanabe
A simple DoA estimator is proposed with a switched beam antenna. The estimator is implemented with an adjacent pattern power ratio algorithm. For a single source signal, the received signal powers are measured while the antenna switches over a set of measured directive beam patterns. The pattern that exhibits the maximum received signal power is chosen. Then, the ratio between the pattern adjacent to the chosen pattern and the chosen pattern, is used to find the DoA by using a lookup table or by performing a linear regression approximation. Compared with conventional DoA estimators with switched beam antenna, the proposed algorithm allows DoA estimation with low computational cost, without sacrificing much the estimation precision. Computer simulations and experiments in an anechoic chamber are carried out to verify the proposed algorithm with a switched beam antenna: the electronically steerable parasitic array radiator (ESPAR) antenna.
{"title":"A simple DoA estimator using adjacent pattern power ratio with switched beam antenna","authors":"Y. Ozaki, Jun Ozawa, Eddy Taillefer, Jun Cheng, Y. Watanabe","doi":"10.1109/WCSP.2010.5633543","DOIUrl":"https://doi.org/10.1109/WCSP.2010.5633543","url":null,"abstract":"A simple DoA estimator is proposed with a switched beam antenna. The estimator is implemented with an adjacent pattern power ratio algorithm. For a single source signal, the received signal powers are measured while the antenna switches over a set of measured directive beam patterns. The pattern that exhibits the maximum received signal power is chosen. Then, the ratio between the pattern adjacent to the chosen pattern and the chosen pattern, is used to find the DoA by using a lookup table or by performing a linear regression approximation. Compared with conventional DoA estimators with switched beam antenna, the proposed algorithm allows DoA estimation with low computational cost, without sacrificing much the estimation precision. Computer simulations and experiments in an anechoic chamber are carried out to verify the proposed algorithm with a switched beam antenna: the electronically steerable parasitic array radiator (ESPAR) antenna.","PeriodicalId":448094,"journal":{"name":"2010 International Conference on Wireless Communications & Signal Processing (WCSP)","volume":"339 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134149146","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}
Pub Date : 2010-11-11DOI: 10.1109/WCSP.2010.5633145
Hua Li, Hongbo Xu, Jing Jin, Shouyin Liu
In cognitive radio networks, to take advantage of idle spectrum of a primary user opportunistically, a cognitive radio user should detect the licensed channel frame-by-frame. In this paper, the cognitive radio user performs spectrum sensing firstly in each frame. If the primary user is found to be absent/ present, the cognitive radio user will transmit/wait for a while accordingly. We optimize a different transmitting/waiting duration when a detected energy value is within a different interval. Then an adaptive transmitting/waiting duration varying with the detected energy value is formulated. Numerical results show that our scheme has a better performance compared with the conventional scheme.
{"title":"An optimal adaptive transmitting and waiting durations based on detected energy values in cognitive radio networks","authors":"Hua Li, Hongbo Xu, Jing Jin, Shouyin Liu","doi":"10.1109/WCSP.2010.5633145","DOIUrl":"https://doi.org/10.1109/WCSP.2010.5633145","url":null,"abstract":"In cognitive radio networks, to take advantage of idle spectrum of a primary user opportunistically, a cognitive radio user should detect the licensed channel frame-by-frame. In this paper, the cognitive radio user performs spectrum sensing firstly in each frame. If the primary user is found to be absent/ present, the cognitive radio user will transmit/wait for a while accordingly. We optimize a different transmitting/waiting duration when a detected energy value is within a different interval. Then an adaptive transmitting/waiting duration varying with the detected energy value is formulated. Numerical results show that our scheme has a better performance compared with the conventional scheme.","PeriodicalId":448094,"journal":{"name":"2010 International Conference on Wireless Communications & Signal Processing (WCSP)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132560894","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}
Pub Date : 2010-11-11DOI: 10.1109/WCSP.2010.5631708
Jianbin Chen, Lei Zhu, Qi-hui Wu, Zhixiang Shen
The increasing demand on multi-media services with very different QoS requirements and the employment of new wireless network protocols like 802.11 and 802.16, underscore the need for a network capable of supporting multi-services. Based on the LWDF (Largest Weighted Delay First) algorithm, DS-LWDF (Differentiated Service-LWDF) algorithm is proposed to realize the scheduling among RT (Real Time) and NRT (Non-Real Time) services. Moreover, according to the receive power of ACK frames, WP-LWDF (Weighted Power-LWDF) algorithm is proposed using a weighted differentiated-service function based on DS-LWDF algorithm. The simulation results in QualNet show that both DS-LWDF algorithm and WP-LWDF algorithm guarantee the throughput and fairness among NRT services while markedly reduce the delay of RT services. Furthermore, by introducing the weighted power, WP-LWDF algorithm optimizes the delay and throughput performance for RT services based on the DS-LWDF algorithm.
对具有不同QoS要求的多媒体业务的需求不断增加，以及采用新的无线网络协议，如802.11和802.16，强调了对能够支持多业务的网络的需求。在最大加权延迟优先(LWDF)算法的基础上，提出了DS-LWDF (Differentiated Service-LWDF)算法，实现实时(RT)和非实时(NRT)业务之间的调度。此外，根据ACK帧的接收功率，在DS-LWDF算法的基础上，提出了加权差分服务函数WP-LWDF (Weighted power - lwdf)算法。在QualNet中的仿真结果表明，DS-LWDF算法和WP-LWDF算法都保证了NRT业务之间的吞吐量和公平性，同时显著降低了RT业务的时延。此外，WP-LWDF算法通过引入加权功率，在DS-LWDF算法的基础上对RT业务的时延和吞吐量性能进行了优化。
{"title":"Multi-services supporting weighted power scheduling algorithm based on LWDF","authors":"Jianbin Chen, Lei Zhu, Qi-hui Wu, Zhixiang Shen","doi":"10.1109/WCSP.2010.5631708","DOIUrl":"https://doi.org/10.1109/WCSP.2010.5631708","url":null,"abstract":"The increasing demand on multi-media services with very different QoS requirements and the employment of new wireless network protocols like 802.11 and 802.16, underscore the need for a network capable of supporting multi-services. Based on the LWDF (Largest Weighted Delay First) algorithm, DS-LWDF (Differentiated Service-LWDF) algorithm is proposed to realize the scheduling among RT (Real Time) and NRT (Non-Real Time) services. Moreover, according to the receive power of ACK frames, WP-LWDF (Weighted Power-LWDF) algorithm is proposed using a weighted differentiated-service function based on DS-LWDF algorithm. The simulation results in QualNet show that both DS-LWDF algorithm and WP-LWDF algorithm guarantee the throughput and fairness among NRT services while markedly reduce the delay of RT services. Furthermore, by introducing the weighted power, WP-LWDF algorithm optimizes the delay and throughput performance for RT services based on the DS-LWDF algorithm.","PeriodicalId":448094,"journal":{"name":"2010 International Conference on Wireless Communications & Signal Processing (WCSP)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130060046","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}
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