2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications (CROWNCOM)最新文献

Signal separation and reconstruction method for simultaneously received multi-system signals in a unified wireless system 统一无线系统中同时接收多系统信号的信号分离与重构方法

2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications (CROWNCOM) Pub Date : 2012-04-01 DOI: 10.1587/TRANSCOM.E95.B.1085

Takayuki Yamada, Doohwan Lee, H. Shiba, Y. Yamaguchi, K. Uehara

{"title":"Signal separation and reconstruction method for simultaneously received multi-system signals in a unified wireless system","authors":"Takayuki Yamada, Doohwan Lee, H. Shiba, Y. Yamaguchi, K. Uehara","doi":"10.1587/TRANSCOM.E95.B.1085","DOIUrl":"https://doi.org/10.1587/TRANSCOM.E95.B.1085","url":null,"abstract":"These days, a wide variety of wireless systems are used and new wireless systems appear one after another on the market. In this regard, we proposed a unified wireless system that we call “flexible wireless system”. Comprising flexible access points and a flexible signal processing unit, it collectively receives a wideband spectrum that includes multiple signals from various wireless systems. In cases of simultaneous multiple signal reception, however, reception performance degrades due to the interference among multiple signals. To address this problem, we propose a new signal separation and reconstruction method for spectrally overlapped signals. The method analyzes spectral information obtained by the short time Fourier transform to extract amplitude and phase values at each center frequency of overlapped signals. Using these values enables signals from received radio wave data to be separated and reconstructed for simultaneous multi-system reception. Computer simulation results obtained in evaluating the method's performance confirmed its effectiveness.","PeriodicalId":249175,"journal":{"name":"2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications (CROWNCOM)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125493229","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: 7

Transmitting-collision tradeoff in cognitive radio networks: A flexible transmitting approach 认知无线电网络中发射与碰撞的权衡:一种灵活的发射方法

2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications (CROWNCOM) Pub Date : 2011-06-01 DOI: 10.4108/ICST.CROWNCOM.2011.245852

Hong Du, Zaixue Wei, Lu Ye, Yu Wang, Dacheng Yang

{"title":"Transmitting-collision tradeoff in cognitive radio networks: A flexible transmitting approach","authors":"Hong Du, Zaixue Wei, Lu Ye, Yu Wang, Dacheng Yang","doi":"10.4108/ICST.CROWNCOM.2011.245852","DOIUrl":"https://doi.org/10.4108/ICST.CROWNCOM.2011.245852","url":null,"abstract":"In cognitive radio networks, in order to avoid collision to primary user (PU), cognitive radio (CR) user ought to sense the spectrum periodically to certify that PU is absent. However, the collision to PU also occurs due to imperfect sensing or PU's returning when CR user is transmitting. In this paper, we study a transmitting-collision tradeoff problem in cognitive radio networks. In particular, we investigate a flexible data transmitting scheme so as to minimize the collision to PU under the probability of detection constrains. In addition, by jointly considering both CR user's traffic and PU's state, the probability of collision is derived in detail. Finally, numerical results indicate that the proposed approach can give a superior performance than the fixed frame duration mechanism. The probability of collision for the proposed scheme is lower than conventional mechanism obviously. The conclusion is that the larger traffic parameter of CR user leads to higher collision to PU. By increasing the probability of detection can reduce the collision to PU.","PeriodicalId":249175,"journal":{"name":"2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications (CROWNCOM)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117160869","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

Exploiting spatial dimension in cognitive radios and networks 利用认知无线电和网络的空间维度

2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications (CROWNCOM) Pub Date : 2011-06-01 DOI: 10.4108/ICST.CROWNCOM.2011.245907

H. Sarvanko, M. Höyhtyä, M. Matinmikko, A. Mämmelä

引用次数: 9

Multitaper spectrum sensing of OFDMA signals in frequency selective fading environment 频率选择性衰落环境下OFDMA信号的多锥度频谱感知

2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications (CROWNCOM) Pub Date : 2011-06-01 DOI: 10.4108/ICST.CROWNCOM.2011.245943

Yan Xin, Kyungtae Kim, S. Rangarajan

引用次数: 6

Game theoretical modelling for dynamic spectrum access in TV whitespace 电视空白中动态频谱接入的博弈理论建模

2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications (CROWNCOM) Pub Date : 2011-06-01 DOI: 10.4108/ICST.CROWNCOM.2011.245991

L. Cremene, D. Dumitrescu, Réka Nagy, M. Cremene

引用次数: 5

Spectrum allocation strategies for heterogeneous networks 异构网络的频谱分配策略

2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications (CROWNCOM) Pub Date : 2011-06-01 DOI: 10.4108/ICST.CROWNCOM.2011.245939

Rindranirina Ramamonjison, G. Tran, K. Sakaguchi, K. Araki, S. Kaneko, Y. Kishi, Noriaki Miyazaki

引用次数: 7

ΣΔ ADC with fractional sample rate conversion for software defined radio receiver ΣΔ具有分数采样率转换的ADC，用于软件定义的无线电接收机

2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications (CROWNCOM) Pub Date : 2011-06-01 DOI: 10.4108/ICST.CROWNCOM.2011.245770

Akira Tanaka, M. Inamori, Y. Sanada

{"title":"ΣΔ ADC with fractional sample rate conversion for software defined radio receiver","authors":"Akira Tanaka, M. Inamori, Y. Sanada","doi":"10.4108/ICST.CROWNCOM.2011.245770","DOIUrl":"https://doi.org/10.4108/ICST.CROWNCOM.2011.245770","url":null,"abstract":"An analog-to-digital converter (ADC) in a software defined radio (SDR) receiver must be able to support the specifications of various wireless standards. It should also work with the low power supply voltage of CMOS circuits. A ΣΔ ADC is one of the solutions for the SDR receiver. However, the power consumption of the circuits, such as a lowpass filter (LPF) and a decimator after the ΣΔ modulator is large due to the high sampling speed. On the other hand, since a different wireless communication standard has a different master clock rate, it is necessary to provide the clock rate suitable for each standard. As a solution for the problem, direct insertion/deletion based sample rate conversion (SRC) has been proposed. Nevertheless, in order to apply this method to the ΣΔ ADC, the problem of the high clock speed in the circuits of the LPF after ΣΔ modulator remains. In this paper, a novel ΣΔ ADC with fractional SRC is proposed. In the proposed scheme, SRC and filtering are combined. By filtering and decimating the output of the ΣΔ modulator in parallel with Q transversal filters the clock speed of the circuits of the SRC and the LPF can be reduced P times for Q/P SRC.","PeriodicalId":249175,"journal":{"name":"2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications (CROWNCOM)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126281868","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

Optimized strategies for coordinated spectrum sensing in Cognitive Radio Networks 认知无线电网络中协调频谱感知的优化策略

2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications (CROWNCOM) Pub Date : 2011-06-01 DOI: 10.4108/ICST.CROWNCOM.2011.245825

Zaili Wang, Z. Feng, Di Zhang, Jiantao Xue, Ping Zhang

引用次数: 6

Eigenvalue ratio detection based on exact moments of smallest and largest eigenvalues 基于最小和最大特征值的精确矩的特征值比检测

2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications (CROWNCOM) Pub Date : 2011-06-01 DOI: 10.4108/ICST.CROWNCOM.2011.246151

M. Z. Shakir, Wuchen Tang, A. Rao, M. Imran, Mohamed-Slim Alouini

{"title":"Eigenvalue ratio detection based on exact moments of smallest and largest eigenvalues","authors":"M. Z. Shakir, Wuchen Tang, A. Rao, M. Imran, Mohamed-Slim Alouini","doi":"10.4108/ICST.CROWNCOM.2011.246151","DOIUrl":"https://doi.org/10.4108/ICST.CROWNCOM.2011.246151","url":null,"abstract":"Detection based on eigenvalues of received signal covariance matrix is currently one of the most effective solution for spectrum sensing problem in cognitive radios. However, the results of these schemes always depend on asymptotic assumptions since the close-formed expression of exact eigenvalues ratio distribution is exceptionally complex to compute in practice. In this paper, non-asymptotic spectrum sensing approach to approximate the extreme eigenvalues is introduced. In this context, the Gaussian approximation approach based on exact analytical moments of extreme eigenvalues is presented. In this approach, the extreme eigenvalues are considered as dependent Gaussian random variables such that the joint probability density function (PDF) is approximated by bivariate Gaussian distribution function for any number of cooperating secondary users and received samples. In this context, the definition of Copula is cited to analyze the extent of the dependency between the extreme eigenvalues. Later, the decision threshold based on the ratio of dependent Gaussian extreme eigenvalues is derived. The performance analysis of our newly proposed approach is compared with the already published asymptotic Tracy-Widom approximation approach.","PeriodicalId":249175,"journal":{"name":"2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications (CROWNCOM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124369647","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

Binary power control in dynamic spectrum access 动态频谱接入中的二进制功率控制

2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications (CROWNCOM) Pub Date : 2011-06-01 DOI: 10.4108/ICST.CROWNCOM.2011.245862

B. Ellingsaeter, T. Maseng

引用次数: 0