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Implementation of MB-OFDM Transmitter Baseband Based on FPGA 基于FPGA的MB-OFDM发射机基带实现
2008 4th IEEE International Conference on Circuits and Systems for Communications Pub Date : 2008-05-26 DOI: 10.1109/ICCSC.2008.18
Xu Jinsong, Lu Xiaochun, Wu Haitao, Bian Yujing, Zou Decai, Zou Xiaolong, Wang Chaogang
{"title":"Implementation of MB-OFDM Transmitter Baseband Based on FPGA","authors":"Xu Jinsong, Lu Xiaochun, Wu Haitao, Bian Yujing, Zou Decai, Zou Xiaolong, Wang Chaogang","doi":"10.1109/ICCSC.2008.18","DOIUrl":"https://doi.org/10.1109/ICCSC.2008.18","url":null,"abstract":"Multi-Band Orthogonal Frequency Division Multiplexing (MB-OFDM) is a suitable solution to implementation of high speed data transmission in ultra wideband spectrum by dividing the spectrum available into multiple bands. The baseband of transmitter is one of the most important parts in MB-OFDM system. The structure of MB-OFDM system transmitter is introduced in this paper and the design of transmitter baseband based on FPGA is described in detail. The design has been validated with Xilinx Virtex II FPGA. The results show that all modules designed has achieved the expected purpose both in precision and resource, with simplicity and high efficiency, and can meet the demand of MB-OFDM systems.","PeriodicalId":137660,"journal":{"name":"2008 4th IEEE International Conference on Circuits and Systems for Communications","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131745206","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: 14
Performance of Non-Binary RS-Turbo Concatenated Codes 非二进制RS-Turbo级联码的性能
2008 4th IEEE International Conference on Circuits and Systems for Communications Pub Date : 2008-05-26 DOI: 10.1109/ICCSC.2008.169
Ping Shi, Ming-rui Hou, Rui Lv
{"title":"Performance of Non-Binary RS-Turbo Concatenated Codes","authors":"Ping Shi, Ming-rui Hou, Rui Lv","doi":"10.1109/ICCSC.2008.169","DOIUrl":"https://doi.org/10.1109/ICCSC.2008.169","url":null,"abstract":"In this paper the encoder structure of non-binary turbo codes is presented and the symbol-by-symbol log-MAP decoding algorithm is analyzed in detail. A new scheme of RS-turbo concatenated codes is designed which includes an RS code (255,239,8) and a non-binary Turbo code built from two RSC component codes with m=2 inputs. The simulations were made for frame length N=2048 bits and for the maximum iteration number of 8. The AWGN channel and the BPSK modulation were employed. The simulation results show that the proposed scheme can significantly improve the BER performance at high SNR and reduce the iteration number compared to the conventional non-binary turbo code. Furthermore, the concatenated RS code can supply a simple stopping criterion for Turbo iterative decoding.","PeriodicalId":137660,"journal":{"name":"2008 4th IEEE International Conference on Circuits and Systems for Communications","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130914759","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: 3
Analytical Throughput Evaluation of Wireless Networks Using Multibeam Antennas 多波束天线无线网络吞吐量分析评估
2008 4th IEEE International Conference on Circuits and Systems for Communications Pub Date : 2008-05-26 DOI: 10.1109/ICCSC.2008.91
Xin Li, Yimin D. Zhang, M. Amin
{"title":"Analytical Throughput Evaluation of Wireless Networks Using Multibeam Antennas","authors":"Xin Li, Yimin D. Zhang, M. Amin","doi":"10.1109/ICCSC.2008.91","DOIUrl":"https://doi.org/10.1109/ICCSC.2008.91","url":null,"abstract":"In a wireless network, concurrent communications between a node and multiple neighboring nodes through the use of multibeam antenna (MBA) has been shown effective to utilize the spatial dimensionality. As a result, the network throughput and quality-of-service (QoS) can be improved. MBAs can be implemented using multiple fixed-beam antennas (MFBAs) or multi-channel smart antennas (MCSAs). In this paper, the one-hop throughput performance of a node equipped with MBA is evaluated in an analytical framework. Both MFBA and MCSA are considered by using an equivalent antenna beam model. It becomes clear that the use of MFBA is the pessimistic case of MCSA as the normalized beamwidth reaches the maximum value. The upper bound of throughput is achieved in the presence of idealized collision avoidance schemes, whereas the lower bound is reached in the absence of collision avoidance schemes.","PeriodicalId":137660,"journal":{"name":"2008 4th IEEE International Conference on Circuits and Systems for Communications","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133670386","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: 3
A Selective Feedback Detection Algorithm Based on FDE-NP for MIMO Systems 一种基于FDE-NP的MIMO系统选择性反馈检测算法
2008 4th IEEE International Conference on Circuits and Systems for Communications Pub Date : 2008-05-26 DOI: 10.1109/ICCSC.2008.87
Wei Zhao, Wenjin Wang, Qiuzhe Zhao, Xiqi Gao
{"title":"A Selective Feedback Detection Algorithm Based on FDE-NP for MIMO Systems","authors":"Wei Zhao, Wenjin Wang, Qiuzhe Zhao, Xiqi Gao","doi":"10.1109/ICCSC.2008.87","DOIUrl":"https://doi.org/10.1109/ICCSC.2008.87","url":null,"abstract":"Compared with the conventional FDE scheme, the FDE-NP structure which consists of a linear frequency domain equalizer (FDE) and a time domain noise predictor (NP) has lower complexity and achieves better performance and complexity trade-off. In this paper, we propose a selective detection algorithm for FDE-NP model in MIMO system, which we refer to as selective feedback detection (FDE-NP-SEL) algorithm. By evaluating the average MMSEs during the data transmission for all the possible feedback modes, the new detection algorithm chooses the optimal one to design time-domain NPs. In particular, to simplify the design of the feedback filters, we consider an inverted ordered detection (FDE-NP-INV) algorithm, in which decisions are fed back to predict and cancel their pre-cursor inter-symbol interference (ISI) effects to the previous signals. Simulation results show that the new proposed FDE-NP-INV scheme achieves significant performance improvement over the conventional FDE-NP scheme with the same complexity. Furthermore, we propose the hybrid ordered detection (FDE-NP-HYB) algorithm by combining the FDE-NP-INV algorithm with the conventional FDE-NP scheme . It is shown that the proposed FDE-NP-HYB can further improve the performance.","PeriodicalId":137660,"journal":{"name":"2008 4th IEEE International Conference on Circuits and Systems for Communications","volume":"2021 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115064251","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
Capacity of Impulsive Modulation over Multipath Interference Channels 多径干扰信道上脉冲调制的容量
2008 4th IEEE International Conference on Circuits and Systems for Communications Pub Date : 2008-05-26 DOI: 10.1109/ICCSC.2008.47
M. Gariby, T. Gariby, R. Zamir
{"title":"Capacity of Impulsive Modulation over Multipath Interference Channels","authors":"M. Gariby, T. Gariby, R. Zamir","doi":"10.1109/ICCSC.2008.47","DOIUrl":"https://doi.org/10.1109/ICCSC.2008.47","url":null,"abstract":"We extend results regarding the most favorable degree of impulsive interference to the case of a sparse multipath channel. The system under investigation is of multiple un-synchronized communication links, each employing randomly spread ternary (0,+1,-1) CDMA signaling. It is assumed that the channel-state information, i.e., the instantaneous interference level from neighboring links, is available at the decoder, and this interference is considered as noise. We show that for a fixed average transmission power, the Shannon capacity of the system is maximized by the most impulsive signaling, i.e., spreading patterns consisting of a single non-zero chip. This strengthens our earlier results for the two-user single-path channel case.","PeriodicalId":137660,"journal":{"name":"2008 4th IEEE International Conference on Circuits and Systems for Communications","volume":"182 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115176539","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
A Nonlinear Time Variant Model for Phase Noise in Electrical Oscillators 电振荡器相位噪声的非线性时变模型
2008 4th IEEE International Conference on Circuits and Systems for Communications Pub Date : 2008-05-26 DOI: 10.1109/ICCSC.2008.166
H. Yin, Zhigang Mao
{"title":"A Nonlinear Time Variant Model for Phase Noise in Electrical Oscillators","authors":"H. Yin, Zhigang Mao","doi":"10.1109/ICCSC.2008.166","DOIUrl":"https://doi.org/10.1109/ICCSC.2008.166","url":null,"abstract":"Linear time variant (LTV) model is capable of making accurate predictions about phase noise in electrical oscillators, on the assumption that current-phase relation is linear. Unfortunately, this linearity assumption is not valid in the presence of high-power environmental noise. The proposed nonlinear time variant (NLTV) model modifies the existing LTV model, considering phase response saturation in electrical oscillators. The accuracy of this model is verified through the simulation of a colpitts oscillator using","PeriodicalId":137660,"journal":{"name":"2008 4th IEEE International Conference on Circuits and Systems for Communications","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115265792","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
The Influence of Subchannel Diversity on the Performance of OFDMA Systems Based on IEEE 802.16 基于IEEE 802.16的子信道分集对OFDMA系统性能的影响
2008 4th IEEE International Conference on Circuits and Systems for Communications Pub Date : 2008-05-26 DOI: 10.1109/ICCSC.2008.12
M. Einhaus, B. Wolz, B. Walke
{"title":"The Influence of Subchannel Diversity on the Performance of OFDMA Systems Based on IEEE 802.16","authors":"M. Einhaus, B. Wolz, B. Walke","doi":"10.1109/ICCSC.2008.12","DOIUrl":"https://doi.org/10.1109/ICCSC.2008.12","url":null,"abstract":"The performance of a mobile radio system based on OFDMA is determined by the type of mapping of logical subchannels, which are allocated for data transmissions, onto the frequency channel. The mapping scheme affects the diversity both within and between the OFDMA subchannels. This paper provides a performance comparison of different subchannel mappings from MAC point of view by means of stochastic event- driven simulations. The tradeoff between the effects of mapping subchannels onto distributed and adjacent subcarrier sets are investigated in detail. The effects are robust SNR estimation and possible throughput gains due to frequency adaptive scheduling, respectively.","PeriodicalId":137660,"journal":{"name":"2008 4th IEEE International Conference on Circuits and Systems for Communications","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122760414","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
Spectrum Sensing, Access and Coexistence Testbed for Cognitive Radio using USRP 基于USRP的认知无线电频谱感知、接入与共存测试平台
2008 4th IEEE International Conference on Circuits and Systems for Communications Pub Date : 2008-05-26 DOI: 10.1109/ICCSC.2008.63
Zhi Yan, Zhangchao Ma, Hanwen Cao, Gang Li, Wenbo Wang
{"title":"Spectrum Sensing, Access and Coexistence Testbed for Cognitive Radio using USRP","authors":"Zhi Yan, Zhangchao Ma, Hanwen Cao, Gang Li, Wenbo Wang","doi":"10.1109/ICCSC.2008.63","DOIUrl":"https://doi.org/10.1109/ICCSC.2008.63","url":null,"abstract":"The idea of cognitive radio has created a great interest in academic and industrial research recently. As a result, there are a large number of proposals for physical and network layer functionalities. In this paper, we demonstrate an experimental platform with the USRP board developed by Ettus Research that can facilitate the development of PHY and MAC layers functionality. Some key results from this experience so far are presented, including an over-the-air interoperability analysis of two different SDR (software defined radio) architectures in the same frequency band, the effect of dynamic spectrum access on legacy system and analysis of actual co-existence experiences involving primary users and secondary opportunistic spectrum users. In particular, we focus our attention on spectrum sensing and spectrum coexistence as an example that incorporates both digital signal processing and networking techniques to show how this platform could be used to conduct comprehensive research in cognitive radio.","PeriodicalId":137660,"journal":{"name":"2008 4th IEEE International Conference on Circuits and Systems for Communications","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122817193","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: 58
Memory Effect Modeling of Wideband Wireless Transmitters Using Neural Networks 基于神经网络的宽带无线发射机记忆效应建模
2008 4th IEEE International Conference on Circuits and Systems for Communications Pub Date : 2008-05-26 DOI: 10.1109/ICCSC.2008.154
Taijun Liu, Yan Ye, Xingbin Zeng, F. Ghannouchi
{"title":"Memory Effect Modeling of Wideband Wireless Transmitters Using Neural Networks","authors":"Taijun Liu, Yan Ye, Xingbin Zeng, F. Ghannouchi","doi":"10.1109/ICCSC.2008.154","DOIUrl":"https://doi.org/10.1109/ICCSC.2008.154","url":null,"abstract":"In this paper a three-layer real-valued time-delayed neural network (RVTDNN) is employed to simulate the memory effects of a wideband wireless transmitter. The RVTDNN is trained at first using a Matlab program, and then it is implemented in Agilent Advanced Design System software. Different training algorithms have been applied to the neural network to extract its weights and biases, and it is found that the Levenberg-Marquardt (LM) algorithm exhibits the best performance. A look-up-table based memoryless predistorter is cascaded to the RVTDNN model to validate the capability of the RVTDNN model in simulating the memory effects of the transmitter. The validation results demonstrate that the identified RVTDNN model can accurately mimic the memory effects of a wideband wireless transmitter prototype, which is based on a 60-watt push-pull GaAs FET power amplifier, under a two-carrier 3GPP-FDD excitation signal.","PeriodicalId":137660,"journal":{"name":"2008 4th IEEE International Conference on Circuits and Systems for Communications","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128343411","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
Research and Improve on Secure Routing Protocols in Wireless Sensor Networks 无线传感器网络安全路由协议的研究与改进
2008 4th IEEE International Conference on Circuits and Systems for Communications Pub Date : 2008-05-26 DOI: 10.1109/ICCSC.2008.186
Di Wu, Gang Hu
{"title":"Research and Improve on Secure Routing Protocols in Wireless Sensor Networks","authors":"Di Wu, Gang Hu","doi":"10.1109/ICCSC.2008.186","DOIUrl":"https://doi.org/10.1109/ICCSC.2008.186","url":null,"abstract":"Most routing protocols in wireless sensor networks take networks lifetime as design target, but not security. This paper researches on routing security and proposes SS-LEACH algorithm based on LEACH algorithm. The SS-LEACH algorithm makes use of nodes self-localization technology and keys pre-distribution strategy. It improves the method electing cluster-heads and forms dynamic stochastic multi-paths cluster-heads chains. The results of simulation demonstrate that the SS-LEACH algorithm not only prolongs the lifetime of wireless sensor networks effectively, but also enhances routing security strongly.","PeriodicalId":137660,"journal":{"name":"2008 4th IEEE International Conference on Circuits and Systems for Communications","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128586585","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: 54
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