UNIFORM CIRCULAR ANTENNA ARRAY (UCA)

/2π± between those two E-fields is provided. In the second part of this chapter, the analysis, design and implementation of an Aperture Coupled Micro-Strip Antenna (ACMSA) are introduced. A quadrature hybrid is used as a feeder for providing simultaneous circular polarization diversity[r]

Strategic Grant 7001697. This work is done when Fei Ji wasvisiting City University of Hong Kong.REFERENCES[1] A. Nehorai and E. Paldi, “Vector sensor processing for electro-magnetic source localization,” in Proceedings of the 25th Asilo-mar Conference on Signals, Systems and Computers, vol. 1, pp.56[r]

Named for J. Wullenweber, 1488–1537, Lord Mayor of Lübeckc01.qxd 12/1/2005 3:06 PM Page 5Some of these huge antennas may still be operating. See also [IRE PGAP Newsletter Vol.3, December 1960].During this period, new, efficient pattern synthesis methods and practical feeding andbeam control schemes[r]

ous subsections are all on the same form, that is, dVdU=λR/ViX,whereX is given by the orientation of the arrays. Afirst comment is that utilizing the design equations to achievehigh performance MIMO links is best suited for fi xed sys-tems (such as wireless LANs with LOS conditions,5broad-band wireles[r]

time.6.1.3. Circle fitting: real-world imagesProposed methods can be applied to practical issues. We as-sume that all expected contours are centered on the middleof the image. We first give the result obtained by circle fitting(see Figure 6).Figure 6 shows that the contour of each object presentedis effi[r]

EURASIP Journal on Applied Signal Processing 2004:9, 1376–1383c 2004 Hindawi Publishing CorporationHigh-Performance Wireless via the Merger of CIChip-Shaped DS-CDMA and Oscillating-BeamSmart Antenna ArraysSeyed Alireza ZekavatDepartment of Electrical and Computer Engineering, Michigan Techno[r]

In contemporary literature, most of the efforts have primarily been directed for estimating the two dimensional spa-tial frequencies (namely, the azimuth angle φ and the elevation angle θ) of plane waves that are arriving at an antenna*Corresponding author.E-mail address: nyilmaze@syr.edu (N.[r]

of research effort has been dedicated to the investigation ofMIMO systems performance, results, conclusions, and ideason the critical implementation aspects of smart antennas infuture wireless systems remain fragmental.The objective of this special issue is to address these crit-ical aspects and pres[r]

Ris also gener-ated according to uniform distribution in [−110, −80] dBm.The analytical relationships (36)and(37)forγ= 4.55 arealso plotted. As the plots demonstrate, the simulated resultsconverge to the asymptotic expression for both OCL-DASand CAS, and OCL-DAS outperforms CAS by more than11[r]

... tasks, has led to a huge demand for wideband, multifunction antennas Sinuous antennas are chosen as the primary focus for this thesis to achieve quad- polarization, wideband performance while attempting... Recommendations and research directions are proposed for consideration in future developme[r]

6. Summary and outlook In this chapter, the antenna in RFID system is discussed, and the design of antenna is also described. The main contents include the status of the antenna in the RFID system, the design method for the antenna, the power transmission between the tag[r]

Hindawi Publishing CorporationEURASIP Journal on Advances in Signal ProcessingVolume 2009, Article ID 128516, 8 pagesdoi:10.1155/2009/128516Research ArticleSmart Antenna UKM Testbed for Digital B eamforming SystemMohammad Tariqul Islam,1Norbahiah Misran,1, 2and Baharudin Yatim11Institute of S[r]

is ideally suited for software defined radios (SDR).Index Terms— Smart Antennas, MIMO, ChannelModelling, Real-time Simulation, Software Defined Ra-dioI. INTRODUCTIONSmart antennas use antenna arrays to reject inter-ference and to improve system capacity in mobilecommunication systems. Multiplyi[r]

measurement environment are described in Section 3 andthe measurement results are shown in Section 4. The resultsare concluded in Section 5.2. INDOOR COVERAGE PROVIDERSIn the era of line telephones, wireless communicationnetworks were mainly used for speech connections andout of office, thus requireme[r]

The authors would like to thank Science Foundation Irelandfor their generous funding of this project through the Centrefor Telecommunications Value-Chain Research (CTVR).REFERENCES[1] N. Tyler, B. Allen, and H. Aghvami, “Adaptive antennas: thecalibration problem,” IEEE Communications Magazine, vol.4[r]

and poor contrast due to the wavelength cutoff effect. Deepor EUV light sources of shorter wavelengths might be usedto extend the methodology of the traditional optical lithog-raphy, but the cost and complexity of the optical system willincrease dramatically. Recently, numerical9,10and experi-mental[r]

int array_rand(array input [, int num_req]) Description The array_rand() function, which was added in PHP 4.0, randomly picks a key or keys from the input array. If num_req is 1 or not specified, one key will be returned; if num_req is greater than 1, an array wi[r]

0Dynamic power (mW)MRC, 1 BF BVTC MREC MRC, 4Figure 6: Average resource and dynamic power usage for BF, BVTC MREC, and MRC, over 8 trials with mutually independent azimuthspread sequences.performance. Furthermore, since EVTC MREC allows for ef-fective concurrent processing of two users on a single F[r]

signals. This strategy is appropriate for CDMA signals since atime reference can be obtained applying the user code. In theparticular case of universal mobile telecommunication sys-tem (UMTS), the physical layer has been designed to workwith adaptive antennas both in uplink and downlink [2].A signifi[r]