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2006 IEEE Radio and Wireless Symposium最新文献

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A simulation study of interference suppressing OFDM for UWB systems with multiple users 多用户UWB系统中OFDM抑制干扰的仿真研究
2006 IEEE Radio and Wireless Symposium Pub Date : 2006-04-10 DOI: 10.1109/RWS.2006.1615169
D. Popescu, P. Yaddanapudi
{"title":"A simulation study of interference suppressing OFDM for UWB systems with multiple users","authors":"D. Popescu, P. Yaddanapudi","doi":"10.1109/RWS.2006.1615169","DOIUrl":"https://doi.org/10.1109/RWS.2006.1615169","url":null,"abstract":"In this paper we investigate the use of an interference suppressing scheme based on orthogonal frequency division multiplexing (OFDM) for ultra wideband (UWB) radios in a multiuser scenario corresponding to the uplink of a wireless system with multiple users transmitting to a base station. In order to enable decoding of multiple users at the receiver, we employ multicarrier code division multiple access (MC-CDMA) in which distinct users are assigned distinct codes for transmission. Bit error rate (BER) performance of the scheme is evaluated through numerical simulations for additive white Gaussian noise (AWGN), multipath channels, and narrowband interference, with various choices for user codes.","PeriodicalId":244560,"journal":{"name":"2006 IEEE Radio and Wireless Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133681409","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
Fully-integrated highly-efficient RF Class E SiGe power amplifier with an envelope-tracking technique for EDGE applications 完全集成的高效射频E级SiGe功率放大器，具有用于EDGE应用的包络跟踪技术
2006 IEEE Radio and Wireless Symposium Pub Date : 2006-04-10 DOI: 10.1109/RWS.2006.1615137
J. Popp, Donald Y. C. Lie, Feipeng Wang, Donald Kimball, Lawrence Larson
{"title":"Fully-integrated highly-efficient RF Class E SiGe power amplifier with an envelope-tracking technique for EDGE applications","authors":"J. Popp, Donald Y. C. Lie, Feipeng Wang, Donald Kimball, Lawrence Larson","doi":"10.1109/RWS.2006.1615137","DOIUrl":"https://doi.org/10.1109/RWS.2006.1615137","url":null,"abstract":"This paper reports on the results of a highly efficient monolithically fully-integrated SiGe Class E power amplifier using envelope tracking techniques for EDGE applications. The envelope-tracking (ET) system includes a discrete linear op-amp and a switching power converter. The RF Class E amplifier was fabricated in a 0.18 /spl mu/m BiCMOS SiGe technology. The RF Class E power amplifier achieved a collector efficiency (CE) of 62.7% and the overall power added efficiency (PAE) of the ET system is 44.4% at an output power of 20.4 dBm for an 881 MHz EDGE modulated signal. A discrete envelope switching amplifier achieved 82.8% efficiency while driving the Class E PA voltage supply. The linearized SiGe PA passed the stringent EDGE transmit spectrum mask.","PeriodicalId":244560,"journal":{"name":"2006 IEEE Radio and Wireless Symposium","volume":"316 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133807338","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: 28
Varactor-tuned coupled resonator front-end bandpass filters for cognitive radio applications 用于认知无线电应用的变容调谐耦合谐振器前端带通滤波器
2006 IEEE Radio and Wireless Symposium Pub Date : 2006-04-10 DOI: 10.1109/RWS.2006.1615118
N. Tanzi
{"title":"Varactor-tuned coupled resonator front-end bandpass filters for cognitive radio applications","authors":"N. Tanzi","doi":"10.1109/RWS.2006.1615118","DOIUrl":"https://doi.org/10.1109/RWS.2006.1615118","url":null,"abstract":"The design, implementation and measurement results of varactor-tuned, three coupled resonator, bandpass filters for cognitive radio applications are described. Two distinct filters, one covering 176 MHz-216 MHz and the other covering 476 MHz-698 MHz is described. The filters were implemented using commercially available surface mount components on an FR-4 printed circuit board. The purpose of the bandpass filters is to provide selectivity in the front-end and provide protection from interferers. The two filters improved the intermodulation rejection of the receiver by 24 dB and 27 dB respectively.","PeriodicalId":244560,"journal":{"name":"2006 IEEE Radio and Wireless Symposium","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134106280","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: 5
A low-power FSK modulator/demodulator for an MICS band transceiver 用于MICS频带收发器的低功率FSK调制器/解调器
2006 IEEE Radio and Wireless Symposium Pub Date : 2006-04-10 DOI: 10.1109/RWS.2006.1615119
A. Tekin, M. Yuce, J. Shabani, Wentai Liu
{"title":"A low-power FSK modulator/demodulator for an MICS band transceiver","authors":"A. Tekin, M. Yuce, J. Shabani, Wentai Liu","doi":"10.1109/RWS.2006.1615119","DOIUrl":"https://doi.org/10.1109/RWS.2006.1615119","url":null,"abstract":"This paper presents a low-power FSK (frequency shift keying) modulator/demodulator. It supports a data rate of 20 kb/s and uses a phase interpolating clock recovery circuit that forces the rising edge of the clock track the demodulated data precisely. In the transmitter side, the base-band data directly modulate a four stage differential ring VCO (voltage controlled oscillator) with an FSK tone frequency of 80 kHz fitting into one of ten 300-kHz channels allocated at the new 402-405 MHz MICS (medical implant communication services) band. The designs are implemented in a 0.18-/spl mu/m CMOS process. The all digital demodulator circuits consume only 33.41 /spl mu/A current from a 1.5-V supply.","PeriodicalId":244560,"journal":{"name":"2006 IEEE Radio and Wireless Symposium","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114361120","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: 16
An improved method of generating UWB pulses for high datarate communication 一种用于高数据率通信的UWB脉冲产生的改进方法
2006 IEEE Radio and Wireless Symposium Pub Date : 2006-04-10 DOI: 10.1109/RWS.2006.1615115
R. Zimmer, P. Waldow, A. Beyer
{"title":"An improved method of generating UWB pulses for high datarate communication","authors":"R. Zimmer, P. Waldow, A. Beyer","doi":"10.1109/RWS.2006.1615115","DOIUrl":"https://doi.org/10.1109/RWS.2006.1615115","url":null,"abstract":"The Federal Communications Commission (FCC) has released 7.5 GHz of bandwidth for ultra wideband (UWB)-radiation. In this paper a simple method of generating a pulse that matches the spectrum mask is proposed. Without any mixers a pulse shape that covers nearly the whole UWB spectrum is synthesized from a sinusoidal.","PeriodicalId":244560,"journal":{"name":"2006 IEEE Radio and Wireless Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115493911","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
Effect of device mismatch on the phase and amplitude accuracy in LC quadrature VCOs 器件失配对LC正交压控振荡器相位和幅度精度的影响
2006 IEEE Radio and Wireless Symposium Pub Date : 2006-04-10 DOI: 10.1109/RWS.2006.1615189
I.R. Chamas, S. Raman
{"title":"Effect of device mismatch on the phase and amplitude accuracy in LC quadrature VCOs","authors":"I.R. Chamas, S. Raman","doi":"10.1109/RWS.2006.1615189","DOIUrl":"https://doi.org/10.1109/RWS.2006.1615189","url":null,"abstract":"An overview of cross-coupled LC tank quadrature VCOs is presented. Then, the effect of mismatch on the amplitude and quadrature phase accuracy is discussed. In particular, we focus on the mismatch between the negative resistance (Rneg) and quadrature resistance (R quad) of the two VCOs. By considering a first order linear model of the QVCO, it is shown that a mismatch in Rneg generates an imbalance in the quadrature phase but preserves the amplitude accuracy, whereas a mismatch in Rquad leads to both a relative amplitude error and phase imbalance. Furthermore, the mismatch leads to an effective coupling transconductance GMceff that in turn causes a deviation in the steady state oscillation frequency. The developed analysis is verified using SpectreRF simulation of a parallel QVCO topology (PQVCO)","PeriodicalId":244560,"journal":{"name":"2006 IEEE Radio and Wireless Symposium","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122069288","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: 8
Heterogeneous co-simulation with SDL and SystemC for protocol modeling 异构协同仿真与SDL和SystemC协议建模
2006 IEEE Radio and Wireless Symposium Pub Date : 2006-04-10 DOI: 10.1109/RWS.2006.1615229
T. Jozawa, L. Huang, T. Sakai, S. Takeuchi, M. Kasslin
{"title":"Heterogeneous co-simulation with SDL and SystemC for protocol modeling","authors":"T. Jozawa, L. Huang, T. Sakai, S. Takeuchi, M. Kasslin","doi":"10.1109/RWS.2006.1615229","DOIUrl":"https://doi.org/10.1109/RWS.2006.1615229","url":null,"abstract":"This paper proposes a heterogeneous co-simulation environment using SDL (specification and description language) and SystemC. The medium access control (MAC) protocol of IEEE802.11 wireless LAN (WLAN) is given as an example applied to this co-simulation approach. After functional specification and software-hardware partitioning processes, we designed a sub-part of MAC that requires real-time operations by SystemC, and the other sub-part assumed to be mostly software-executable by SDL. Those two MAC entities are simultaneously simulated on our proposed simulation platform for the purpose of protocol conformance testing and performance evaluation. The paper also presents the basic architecture to enable signal interaction and system timer synchronization between the SDL-designed part and the SystemC-designed part.","PeriodicalId":244560,"journal":{"name":"2006 IEEE Radio and Wireless Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130139861","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
Codebit parsers for adaptive bit loading over MIMO channels 在MIMO信道上自适应位加载的Codebit解析器
2006 IEEE Radio and Wireless Symposium Pub Date : 2006-04-10 DOI: 10.1109/RWS.2006.1615124
Qinghua Li, X.E. Lin
{"title":"Codebit parsers for adaptive bit loading over MIMO channels","authors":"Qinghua Li, X.E. Lin","doi":"10.1109/RWS.2006.1615124","DOIUrl":"https://doi.org/10.1109/RWS.2006.1615124","url":null,"abstract":"Adaptive bit loading (ABL) can be employed to compensate for the signal strength variation across spatial channels in MIMO system that employs SVD beamforming. Due to the significant spread of singular values across the spatial streams, it is beneficial to load each stream with a different number of codebits. In the so called vertically encoded MIMO system, all spatial channels share one channel encoder, and a codebit parser distributes the contiguous codebits into multiple spatial channels, where the ABL scheme determines the load per channel. It is desirable that the codebits in each spatial channel are evenly spaced in the original codeword in order to maximize spatial diversity. The existing block codebit parser (2002) assigns the continuous blocks of codebits to each stream respectively. In the paper, we derive a few codebit parsers, including the optimal one. The simulation results over 802.11n convolutionally coded channels demonstrate the superiority.","PeriodicalId":244560,"journal":{"name":"2006 IEEE Radio and Wireless Symposium","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129578133","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 0.18 /spl mu/m CMOS distributed transversal filter for sub-nanosecond pulse synthesis 用于亚纳秒脉冲合成的0.18 /spl μ m CMOS分布式横向滤波器
2006 IEEE Radio and Wireless Symposium Pub Date : 2006-04-10 DOI: 10.1109/RWS.2006.1615219
Yunliang Zhu, J. Zuegel, J. Marciante, Hui Wu
{"title":"A 0.18 /spl mu/m CMOS distributed transversal filter for sub-nanosecond pulse synthesis","authors":"Yunliang Zhu, J. Zuegel, J. Marciante, Hui Wu","doi":"10.1109/RWS.2006.1615219","DOIUrl":"https://doi.org/10.1109/RWS.2006.1615219","url":null,"abstract":"A distributed transversal filter (DTF) is a good candidate for adaptive processing of ultrafast pulses in wideband systems. In this study, we investigate DTFs for sub-nanosecond pulse shaping and synthesis using standard CMOS technologies. A 5-tap DTF was designed using LC artificial transmission lines. A pulse synthesis algorithm was developed for DTFs. A prototype was fabricated using a standard 0.18 /spl mu/ digital CMOS technology. It successfully demonstrated the sub-nanosecond pulse shaping and synthesis capabilities.","PeriodicalId":244560,"journal":{"name":"2006 IEEE Radio and Wireless Symposium","volume":"23 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121267650","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: 10
Time reversal with MISO for ultra-wideband communications: experimental results 超宽带通信用MISO时间反转:实验结果
2006 IEEE Radio and Wireless Symposium Pub Date : 2006-04-10 DOI: 10.1109/RWS.2006.1615203
R. Qiu, C. Zhou, N. Guo, J.Q. Zhang
{"title":"Time reversal with MISO for ultra-wideband communications: experimental results","authors":"R. Qiu, C. Zhou, N. Guo, J.Q. Zhang","doi":"10.1109/RWS.2006.1615203","DOIUrl":"https://doi.org/10.1109/RWS.2006.1615203","url":null,"abstract":"Time reversal (TR) communications marks a paradigm shift in UWB communications. The system complexity can be shifted from the receiver to the transmitter, which is ideal to UWB sensors. UWB multiple input single output (MISO) is enabled by the use of the TR scheme. Two basic problems are investigated experimentally using short UWB radio pulses (nanosecond duration). Temporal focusing and SNR increase with the number of antennas are verified. Also, reciprocity of realistic channels, the foundation of TR, is demonstrated for the first time in electromagnetics.","PeriodicalId":244560,"journal":{"name":"2006 IEEE Radio and Wireless Symposium","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116443682","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: 112
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