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Radio and Wireless Conference, 2003. RAWCON '03. Proceedings最新文献

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Wideband predistortion linearization system for RF power amplifiers using an envelope modulation technique 采用包络调制技术的射频功率放大器宽带预失真线性化系统
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227977
W. Woo, E. Park, K. U-yen, S. Kenny
{"title":"Wideband predistortion linearization system for RF power amplifiers using an envelope modulation technique","authors":"W. Woo, E. Park, K. U-yen, S. Kenny","doi":"10.1109/RAWCON.2003.1227977","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227977","url":null,"abstract":"This paper proposes a wideband adaptive predistortion linearization system based on high-speed RF envelope modulation applied to the input signal of an RF power amplifier. An FPGA-based look-up table, fed by a digitized envelope power signal, controls the envelope modulation performed by an RF vector modulator. The advantages of this predistortion architecture over conventional baseband digital approaches are a wider bandwidth, and the elimination of the need for digital baseband I/Q streams. The predistortion system was implemented as a testbed. Using 3-carrier CDMA2000 and multi-tone signals, the linearization performances for a 0.5 W GaAs HFET and a 90 W peak envelope power (PEP) LDMOS power amplifier were examined on the testbed. In the third-order intermodulation distortion (IMD) region, the wideband multi-tone testing showed IMD suppressions of 9 to 13 dB over 63 MHz bandwidth and a range of 7 to 8 dB backoff. For the 90 W power amplifier, the system achieved adjacent channel power ratio (ACPR) improvement of 13 dB output power backoff.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127557382","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
Advances in silicon semiconductor device technology for radio and wireless applications 用于无线电和无线应用的硅半导体器件技术的进展
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227965
L. Larson
{"title":"Advances in silicon semiconductor device technology for radio and wireless applications","authors":"L. Larson","doi":"10.1109/RAWCON.2003.1227965","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227965","url":null,"abstract":"Silicon technology has progressed over the last several years from a digitally oriented technology to one well suited for microwave and RF applications at a high level of integration. Technology scaling, both at the transistor and back-end metallization level, has driven this progress. This paper summarizes the silicon technology advances associated with radio and wireless applications.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121084932","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
Blind spatio-temporal interference rejection receiver for direct-sequence CDMA over multipath channels 多径信道直接序列CDMA盲时空抗干扰接收机
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227907
K. Ghadem, T. Denidni, F. Ghanem
{"title":"Blind spatio-temporal interference rejection receiver for direct-sequence CDMA over multipath channels","authors":"K. Ghadem, T. Denidni, F. Ghanem","doi":"10.1109/RAWCON.2003.1227907","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227907","url":null,"abstract":"Many recent studies show an increasing interest to develop new adaptive algorithms, which aim to mitigate interferences in the future mobile radio using a CDMA system. In this paper, a new interference suppression receiver for demodulation of BPSK DS/CDMA signals received by a base station antenna array is presented. The proposed receiver, which is suitable for multipath channels, combines a spatial generalized sidelobe canceller (GSC) algorithm with a temporal GSC filter bank. Besides its simplicity, one major advantage of the new structure is the fact that it incorporates conventional algorithms, which have been suggested for use in adaptive spatial beamforming and implements them in temporal filtering. The performance of the proposed receiver is studied in terms of signal-to-interference-plus-noise ratio (SINR), bit error rate (BER) and achievable capacity of a given CDMA cell.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121513229","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 CDMA system wideband feedforward linearizer design based on an analytical model 基于解析模型的CDMA系统宽带前馈线性化器设计
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227925
A. H. Coskun, S. Demir
{"title":"A CDMA system wideband feedforward linearizer design based on an analytical model","authors":"A. H. Coskun, S. Demir","doi":"10.1109/RAWCON.2003.1227925","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227925","url":null,"abstract":"Feedforward systems are complicated due to the presence of two nonlinear amplifiers and the requirement of amplitude, delay and phase match in two different loops. Analytical tools that characterize this complexity help the designer a lot in rapid and accurate initial optimizations, particularly for wideband applications. In this work we present a wideband feedforward linearizer design for CDMA applications, based on an analytical model and speed and accuracy aspects of the results are compared with RF simulations performed by real power amplifiers and components.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123922751","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
Towards software configurable millimeter wave architectures 迈向软件可配置的毫米波架构
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227880
J. Luy, T. Mack
{"title":"Towards software configurable millimeter wave architectures","authors":"J. Luy, T. Mack","doi":"10.1109/RAWCON.2003.1227880","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227880","url":null,"abstract":"Limitations of existing receivers are the reason for the search for flexible receiver architectures. It is clear that the world of wireless communication systems and radar sensors will be heterogeneous in the future. Therefore, it arises the need for hardware solutions, which can handle several standards and related software implementations. Sampling architectures which sample the RF signal close to the antenna can provide a very flexible approach. Using a bandpass limited subsampling approach it is possible to investigate the basic feasibility of a /spl infin//spl phi/ modulator approach at a carrier frequency of 24 GHz. The alternative six-port concept relies on an increased number of scalar measurements of the received signal and is basically suited for broadband applications. The signal is fed into power dividers, super-posed with a reference signal and the amplitude is measured at a minimum of 3 ports. Flexible signal generation will gain importance if different communication standards have to be supported. With direct digital synthesizers frequencies up to 2 GHz may now be reached.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128445533","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: 2
A model for bandpass nonlinearities based on harmonic measurements 基于谐波测量的带通非线性模型
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227979
A. Behravan, T. Eriksson
{"title":"A model for bandpass nonlinearities based on harmonic measurements","authors":"A. Behravan, T. Eriksson","doi":"10.1109/RAWCON.2003.1227979","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227979","url":null,"abstract":"This paper presents a model for a bandpass nonlinearity, which is based on measurements on several harmonics of the output. The model has a quadrature structure, with a memoryless nonlinearity and a filter in each branch. The structure can describe AM/AM as well as AM/PM conversions. The parameters of the nonlinearity and the filter are jointly optimized to fit the measurements. Analytic expressions for the parameters of the model are found by means of the MMSE optimization. The method is applied to find a model for a 60 GHz solid-state power amplifier based on a set of measurements of different harmonics of the output.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131129839","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: 2
Fractal wideband antennas for software defined radio, UWB, and multiple platform applications 分形宽带天线，用于软件定义无线电、超宽带和多平台应用
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227902
N. Cohen, R. Hohlfeld, D. Moschella, P. Salkind
{"title":"Fractal wideband antennas for software defined radio, UWB, and multiple platform applications","authors":"N. Cohen, R. Hohlfeld, D. Moschella, P. Salkind","doi":"10.1109/RAWCON.2003.1227902","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227902","url":null,"abstract":"We present examples of extremely wideband antennas with applications to SDR, UWB, and multi-service needs in wireless telecommunications. These wideband antennas are devised from fractal antenna technology. The self-similar structure has two key electrical attributes. First, it acts as loading components, which can be used to shrink the antenna size and produce a very broadband LC equivalent circuit, with relatively unchanging SWR for the overall structure. Second, the self-similarity yields individual structures of resonance over a variety of scales, which can be exploited in a prescriptive way to produce the same radiation characteristics over a very broad band. The two physical phenomena can be used to make practical wideband antennas which fall into two general classes: (1) impedance invariant wideband antennas (IIWA); and (2) frequency invariant wideband antennas (FIWA). The practical advantage of such classes of antennae is the new and enabling ability they convey to new telecom (and related) approaches. Trends towards software defined radio (SDR) now place the onus on the antenna designer to come up with a single 'one size fits all', in which the IIWA is a compelling solution. In the case of UWB and other regimes, a single antenna with frequency invariant characteristics is the key, and possible with the FIWA. Such FIWA may also include actual notching of undesired frequencies.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117000230","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 simple soft decision method for the 2-circular 16QAM constellation 一种简单的2圆16QAM星座软决策方法
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227891
Jiangbo Dong, Yongzhong Zou, Daoben Li
{"title":"A simple soft decision method for the 2-circular 16QAM constellation","authors":"Jiangbo Dong, Yongzhong Zou, Daoben Li","doi":"10.1109/RAWCON.2003.1227891","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227891","url":null,"abstract":"In this paper, the 2-circular 16QAM constellation and its soft decision method are studied. By maximizing the decision region of the constellation, the optimal design rule is presented. For the optimal 2-circular 16QAM constellation with maximal minimum decision region /spl Pi//2, a simple method is also proposed to compute the soft information for the received signal. When the turbo code is used in the LAS/CDMA system, the BER performance is evaluated over AWGN channel to prove the optimality of the proposed 2-circular 16QAM constellation and to compare the proposed method with the other approximate method, which is used to compute log-likelihood ratio (LLR) information. The simulation results indicate that the proposed method is 0.75 dB and 0.1 dB better at BER 1e-3 and 1e-5 respectively for the optimal constellation. When the computational complexity is estimated by the number of the multiplication and addition operations, the proposed soft decision method is much simpler.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115224311","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 look ahead scheme for adaptive spectrum utilization 一种自适应频谱利用的前瞻性方案
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227898
S. Lal, A. Mishra
{"title":"A look ahead scheme for adaptive spectrum utilization","authors":"S. Lal, A. Mishra","doi":"10.1109/RAWCON.2003.1227898","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227898","url":null,"abstract":"With the proliferation of wireless multimedia terminals and services, the demand for spectrum has been growing. Yet, there is widespread perception that the spectrum that has been assigned by the FCC for the various commercial and military applications is not being efficiently utilized. As a result there is several efforts underway that are dealing with the sensing of unused spectrum at a given time, and utilizing it for voice and/or data communications. In this paper, we consider spectrum opportunistic systems where the currently assigned spectrum is monitored in real time for idle bands and propose a new method to use any unutilized spectral opportunities, thereby enhancing the spectrum reuse efficiency. This new approach assigns packets to the sensed spectrum opportunities in the downlink of a cellular network.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116543977","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: 19
Design and implementation of a ferroelectric smart antenna system for 802.11b WLANs 802.11b无线局域网铁电智能天线系统的设计与实现
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227911
M. Ahn, G. Quillard, D. Kim, J. Kenney
{"title":"Design and implementation of a ferroelectric smart antenna system for 802.11b WLANs","authors":"M. Ahn, G. Quillard, D. Kim, J. Kenney","doi":"10.1109/RAWCON.2003.1227911","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227911","url":null,"abstract":"This paper focuses on the design and implementation of an IEEE 802.11b WLAN smart antenna system for use in 802.11b WLAN network interface cards. The 2.4 GHz ferroelectric phase shifter is the key component for a two-element beam forming network (BFN). The smart antenna system is controlled by software that automatically adjusts the beam pattern to null interference, and maximize the signal power. More than three orders of magnitude improvement in receive bit-error rate (BER) were measured when steering the antenna to the optimum position.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116551831","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: 13
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