Pub Date : 2011-12-01DOI: 10.1109/ISCIT.2011.6092165
Changliang Zheng, E. Dutkiewicz, R. Liu, R. Vesilo, Gengfa Fang, Zheng Zhou
Cognitive radio (CR) is an exciting technology to improve spectrum utilization. However, spectrum availability can change very fast due to primary user's activity, which makes most of existing CR routing protocols fail to work because they are designed for cognitive radio networks (CRNs) with slow variation of spectrum availability. Opportunistic routing is a promising routing paradigm for CRNs with fast variation of spectrum availability. We propose a multi-channel spectrum aware opportunistic routing (MSAOR) algorithm based on link delay analysis. By introducing channel access probability to characterize the opportunistic CR link, access delay is integrated into queuing delay. Our analysis shows that our algorithm achieves a lower link delay than the existing routing algorithm SAOR (spectrum aware opportunistic routing). Our simulation results also show that our MSAOR algorithm can reduce end-to-end delay by up to 50%, can increase the supported offered load by up to 190% and is more robust than SAOR.
{"title":"Opportunistic routing in multi-channel cognitive radio networks","authors":"Changliang Zheng, E. Dutkiewicz, R. Liu, R. Vesilo, Gengfa Fang, Zheng Zhou","doi":"10.1109/ISCIT.2011.6092165","DOIUrl":"https://doi.org/10.1109/ISCIT.2011.6092165","url":null,"abstract":"Cognitive radio (CR) is an exciting technology to improve spectrum utilization. However, spectrum availability can change very fast due to primary user's activity, which makes most of existing CR routing protocols fail to work because they are designed for cognitive radio networks (CRNs) with slow variation of spectrum availability. Opportunistic routing is a promising routing paradigm for CRNs with fast variation of spectrum availability. We propose a multi-channel spectrum aware opportunistic routing (MSAOR) algorithm based on link delay analysis. By introducing channel access probability to characterize the opportunistic CR link, access delay is integrated into queuing delay. Our analysis shows that our algorithm achieves a lower link delay than the existing routing algorithm SAOR (spectrum aware opportunistic routing). Our simulation results also show that our MSAOR algorithm can reduce end-to-end delay by up to 50%, can increase the supported offered load by up to 190% and is more robust than SAOR.","PeriodicalId":226552,"journal":{"name":"2011 11th International Symposium on Communications & Information Technologies (ISCIT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114095747","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 : 2011-12-01DOI: 10.1109/ISCIT.2011.6092186
Qinglin Qu, Liangguang Li
Speech recognition is the key to realize man-machine interface technology. In order to improve the accuracy of speech recognition and implement the module on embedded system, an embedded speaker-independent isolated word speech recognition system based on ARM is designed after analyzing speech recognition theory. The system uses DTW algorithm and improves the algorithm using a parallelogram to extract characteristic parameters and identify the results. To finish the speech recognition independently, the system uses the STM32 series chip combined with the other external circuitry. The results of speech recognition test can achieve 90%, and which meets the real-time requirements of recognition.
{"title":"Realization of embedded speech recognition module based on STM32","authors":"Qinglin Qu, Liangguang Li","doi":"10.1109/ISCIT.2011.6092186","DOIUrl":"https://doi.org/10.1109/ISCIT.2011.6092186","url":null,"abstract":"Speech recognition is the key to realize man-machine interface technology. In order to improve the accuracy of speech recognition and implement the module on embedded system, an embedded speaker-independent isolated word speech recognition system based on ARM is designed after analyzing speech recognition theory. The system uses DTW algorithm and improves the algorithm using a parallelogram to extract characteristic parameters and identify the results. To finish the speech recognition independently, the system uses the STM32 series chip combined with the other external circuitry. The results of speech recognition test can achieve 90%, and which meets the real-time requirements of recognition.","PeriodicalId":226552,"journal":{"name":"2011 11th International Symposium on Communications & Information Technologies (ISCIT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124207316","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 : 2011-12-01DOI: 10.1109/ISCIT.2011.6089703
S. Yoshizawa, Daisuke Nakagawa, N. Miyazaki, Takaya Kaji, Y. Miyanaga
Multiple-input multiple-output orthogonal frequency multiplexing (MIMO-OFDM) is powerful in enhancing communication capacity or reliance. The IEEE802.11n standard defines use of four spatial streams in spatial division multiplexing (SDM). The task group of IEEE802.11ac will extend it to eight spatial streams. This paper reports LSI development of an 8×8 MIMO-OFDM baseband transceiver compatible with the IEEE802.11ac specification. Two types of 8×8 MMSE MIMO detectors based on Strassen's matrix inversion have been presented. The transceiver designed on 90-nm CMOS technology has 13.3 millions in logic gates and consumes 1.4 W in the maximum power dissipation.
{"title":"LSI development of 8×8 single-user MIMO-OFDM for IEEE 802.11ac WLANs","authors":"S. Yoshizawa, Daisuke Nakagawa, N. Miyazaki, Takaya Kaji, Y. Miyanaga","doi":"10.1109/ISCIT.2011.6089703","DOIUrl":"https://doi.org/10.1109/ISCIT.2011.6089703","url":null,"abstract":"Multiple-input multiple-output orthogonal frequency multiplexing (MIMO-OFDM) is powerful in enhancing communication capacity or reliance. The IEEE802.11n standard defines use of four spatial streams in spatial division multiplexing (SDM). The task group of IEEE802.11ac will extend it to eight spatial streams. This paper reports LSI development of an 8×8 MIMO-OFDM baseband transceiver compatible with the IEEE802.11ac specification. Two types of 8×8 MMSE MIMO detectors based on Strassen's matrix inversion have been presented. The transceiver designed on 90-nm CMOS technology has 13.3 millions in logic gates and consumes 1.4 W in the maximum power dissipation.","PeriodicalId":226552,"journal":{"name":"2011 11th International Symposium on Communications & Information Technologies (ISCIT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122932438","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 : 2011-12-01DOI: 10.1109/ISCIT.2011.6089713
Shilian Zheng, Xiaoniu Yang
Wideband spectrum sensing is a fundamental problem in cognitive radio networks. In this paper, a wideband spectrum sensing procedure which consists of four steps, i.e., coarse support recovery, fine binary detection, band edges detection and clustering, for modulated wideband converter (MWC) based cognitive radio system at sub-Nyquist rate is proposed. Simulations show that with a sub-Nyquist sampling rate, the proposed spectrum sensing procedure can locate spectrum holes correctly.
{"title":"Wideband spectrum sensing in modulated wideband converter based cognitive radio system","authors":"Shilian Zheng, Xiaoniu Yang","doi":"10.1109/ISCIT.2011.6089713","DOIUrl":"https://doi.org/10.1109/ISCIT.2011.6089713","url":null,"abstract":"Wideband spectrum sensing is a fundamental problem in cognitive radio networks. In this paper, a wideband spectrum sensing procedure which consists of four steps, i.e., coarse support recovery, fine binary detection, band edges detection and clustering, for modulated wideband converter (MWC) based cognitive radio system at sub-Nyquist rate is proposed. Simulations show that with a sub-Nyquist sampling rate, the proposed spectrum sensing procedure can locate spectrum holes correctly.","PeriodicalId":226552,"journal":{"name":"2011 11th International Symposium on Communications & Information Technologies (ISCIT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128970760","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 : 2011-12-01DOI: 10.1109/ISCIT.2011.6089752
Haibin Li, D. Grace, P. Mitchell
In this paper, we present an Multi-Dimensional Learning multiple access control scheme for cognitive radio users in unlicensed spectrum. The proposed scheme is developed by applying reinforcement learning to the perspectives of both channel assignment and retransmission policy based upon a multichannel p-persistent CSMA algorithm. In a distributed open spectrum sharing situation, decisions regarding channel assignment and the p-persistent probability level are made by each individual cognitive radio user considering historical transmission experiences. Through the learning process, cognitive radio users are expected to avoid each other, and maintain an optimum transmission rather than contending for a channel. In the situation where two groups of users have different levels of offered traffic, simulation results have shown that our proposed scheme significantly increases the throughput, and optimizes the transmission delay of both cognitive user groups, compared with the schemes that only apply reinforcement learning to channel assignment.
{"title":"Multiple access with multi-dimensional learning for cognitive radio in open spectrum","authors":"Haibin Li, D. Grace, P. Mitchell","doi":"10.1109/ISCIT.2011.6089752","DOIUrl":"https://doi.org/10.1109/ISCIT.2011.6089752","url":null,"abstract":"In this paper, we present an Multi-Dimensional Learning multiple access control scheme for cognitive radio users in unlicensed spectrum. The proposed scheme is developed by applying reinforcement learning to the perspectives of both channel assignment and retransmission policy based upon a multichannel p-persistent CSMA algorithm. In a distributed open spectrum sharing situation, decisions regarding channel assignment and the p-persistent probability level are made by each individual cognitive radio user considering historical transmission experiences. Through the learning process, cognitive radio users are expected to avoid each other, and maintain an optimum transmission rather than contending for a channel. In the situation where two groups of users have different levels of offered traffic, simulation results have shown that our proposed scheme significantly increases the throughput, and optimizes the transmission delay of both cognitive user groups, compared with the schemes that only apply reinforcement learning to channel assignment.","PeriodicalId":226552,"journal":{"name":"2011 11th International Symposium on Communications & Information Technologies (ISCIT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127734957","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 : 2011-12-01DOI: 10.1109/ISCIT.2011.6092181
Zhuo Li, Q. Liang, Wei Wang, Baoju Zhang
Considering the potential interference of ultra-wide hand (UWB) system to OFDM based narrowband wireless communication system, such as IEEF. 802.1 In system, this paper investigates the optimal power allocation scheme for Impulse Radio UWB (1R-IIWB) user in order to maximize the total transmission rate of UWB with the constraints that its interference to IEEE 802.11n user is below a certain threshold. Therefore, UWB user could reach its best performance regarding to transmission rate, while the coexisting IEEE 802.11n user tends to work normally with permissible interference from UWB user. Simulation results show that the optimal power allocation scheme significantly increases the capacity of UWB user compared with equal power allocation scheme.
{"title":"Capacity optimization of ultra-wide band system under the coexistence with IEEE 802.11n","authors":"Zhuo Li, Q. Liang, Wei Wang, Baoju Zhang","doi":"10.1109/ISCIT.2011.6092181","DOIUrl":"https://doi.org/10.1109/ISCIT.2011.6092181","url":null,"abstract":"Considering the potential interference of ultra-wide hand (UWB) system to OFDM based narrowband wireless communication system, such as IEEF. 802.1 In system, this paper investigates the optimal power allocation scheme for Impulse Radio UWB (1R-IIWB) user in order to maximize the total transmission rate of UWB with the constraints that its interference to IEEE 802.11n user is below a certain threshold. Therefore, UWB user could reach its best performance regarding to transmission rate, while the coexisting IEEE 802.11n user tends to work normally with permissible interference from UWB user. Simulation results show that the optimal power allocation scheme significantly increases the capacity of UWB user compared with equal power allocation scheme.","PeriodicalId":226552,"journal":{"name":"2011 11th International Symposium on Communications & Information Technologies (ISCIT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127874481","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 : 2011-12-01DOI: 10.1109/ISCIT.2011.6089755
Wei-xia Zou, Z. Cui, Bin Li, Zheng Zhou, Yucong Hu
This article puts forward a method for codebook design to support beamforming mechanism in a 60GHz millimeter-wave wireless communication environment. The codebook is designed with only phase shifting but not any amplitude adjustment to meet the low power consumption requirement. IEEE802.15.3c beam MRA (main response axis) directions are taken as the original version to make curve fitting, so that weighting vector based on uniform weighting can be obtained to generate a codebook matrix. The simulation results show that, compared with the codebook in IEEE802.15.3c, similar main lobe patterns can be obtained in the proposed codebook, while the side lobe level is lower and the antenna gain at the direction of MRA is higher. Meanwhile, the interference decreases obviously with an improved network channel capacity in the practice environment, and the codebook is also robust to the beam shifting deriving from phase errors.
{"title":"Beamforming codebook design and performance evaluation for 60GHz wireless communication","authors":"Wei-xia Zou, Z. Cui, Bin Li, Zheng Zhou, Yucong Hu","doi":"10.1109/ISCIT.2011.6089755","DOIUrl":"https://doi.org/10.1109/ISCIT.2011.6089755","url":null,"abstract":"This article puts forward a method for codebook design to support beamforming mechanism in a 60GHz millimeter-wave wireless communication environment. The codebook is designed with only phase shifting but not any amplitude adjustment to meet the low power consumption requirement. IEEE802.15.3c beam MRA (main response axis) directions are taken as the original version to make curve fitting, so that weighting vector based on uniform weighting can be obtained to generate a codebook matrix. The simulation results show that, compared with the codebook in IEEE802.15.3c, similar main lobe patterns can be obtained in the proposed codebook, while the side lobe level is lower and the antenna gain at the direction of MRA is higher. Meanwhile, the interference decreases obviously with an improved network channel capacity in the practice environment, and the codebook is also robust to the beam shifting deriving from phase errors.","PeriodicalId":226552,"journal":{"name":"2011 11th International Symposium on Communications & Information Technologies (ISCIT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121160373","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 : 2011-12-01DOI: 10.1109/ISCIT.2011.6092163
K. Sepsirisuk
This paper proposes a new image authentication scheme, which is done in the wavelet domain. A magnitude of coefficient in selected sub-bands is determined in terms of bit plane data. An image feature is generated from this data and then signed to be a digital signature. The Signature can be embedded into host image or separately send. The feature is only 256 bytes. With the proposed scheme, image authentication can be performed effectively.
{"title":"A new image authentication scheme using bit plane feature of wavelet coefficient","authors":"K. Sepsirisuk","doi":"10.1109/ISCIT.2011.6092163","DOIUrl":"https://doi.org/10.1109/ISCIT.2011.6092163","url":null,"abstract":"This paper proposes a new image authentication scheme, which is done in the wavelet domain. A magnitude of coefficient in selected sub-bands is determined in terms of bit plane data. An image feature is generated from this data and then signed to be a digital signature. The Signature can be embedded into host image or separately send. The feature is only 256 bytes. With the proposed scheme, image authentication can be performed effectively.","PeriodicalId":226552,"journal":{"name":"2011 11th International Symposium on Communications & Information Technologies (ISCIT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116332914","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 : 2011-12-01DOI: 10.1109/ISCIT.2011.6089749
Weiting Li, Xiaoning Zhang, Lemin Li, Sheng Wang
We propose an energy saving scheme for wireless access networks called FDS (Frequency Distribution Scheme), which associates frequency allocation with service classes. In this scheme we construct a multi-period algorithm and a TSM (Traffic Supervision Mechanism) to adaptively distribute as few frequencies as possible while still satisfy the traffic demand. We implement our scheme in a sample wireless network, and the simulation results show that our scheme not only saves frequency resources, but also reduces the transmission power.
{"title":"An energy-saving scheme for cellular networks based on frequency distribution","authors":"Weiting Li, Xiaoning Zhang, Lemin Li, Sheng Wang","doi":"10.1109/ISCIT.2011.6089749","DOIUrl":"https://doi.org/10.1109/ISCIT.2011.6089749","url":null,"abstract":"We propose an energy saving scheme for wireless access networks called FDS (Frequency Distribution Scheme), which associates frequency allocation with service classes. In this scheme we construct a multi-period algorithm and a TSM (Traffic Supervision Mechanism) to adaptively distribute as few frequencies as possible while still satisfy the traffic demand. We implement our scheme in a sample wireless network, and the simulation results show that our scheme not only saves frequency resources, but also reduces the transmission power.","PeriodicalId":226552,"journal":{"name":"2011 11th International Symposium on Communications & Information Technologies (ISCIT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115820794","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 : 2011-12-01DOI: 10.1109/ISCIT.2011.6089750
S. Wijetunge, U. Gunawardana, R. Liyanapathirana
A three-dimensional discrete-time Markov Chain model is applied to analyse the performance of the IEEE 802.15.4 MAC protocol under burst channel errors. Real world wireless sensor network conditions including unsaturated traffic, frame retransmission and acknowledgement (ACK) frame transmission are considered for the analysis. The system performance is evaluated in terms of aggregate network throughput, average power consumption per node, frame delivery ratio, and bytes-per-Joule capacity per node. Analytical results are validated through ns − 2 simulations. The effects of varying channel conditions and frame arrival rate on the performance of the system are also discussed.
{"title":"Performance analysis of IEEE 802.15.4 MAC protocol for WSNs in burst error channels","authors":"S. Wijetunge, U. Gunawardana, R. Liyanapathirana","doi":"10.1109/ISCIT.2011.6089750","DOIUrl":"https://doi.org/10.1109/ISCIT.2011.6089750","url":null,"abstract":"A three-dimensional discrete-time Markov Chain model is applied to analyse the performance of the IEEE 802.15.4 MAC protocol under burst channel errors. Real world wireless sensor network conditions including unsaturated traffic, frame retransmission and acknowledgement (ACK) frame transmission are considered for the analysis. The system performance is evaluated in terms of aggregate network throughput, average power consumption per node, frame delivery ratio, and bytes-per-Joule capacity per node. Analytical results are validated through ns − 2 simulations. The effects of varying channel conditions and frame arrival rate on the performance of the system are also discussed.","PeriodicalId":226552,"journal":{"name":"2011 11th International Symposium on Communications & Information Technologies (ISCIT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126655791","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：