radio systems for airliners

... (i.e., for one-time decision on PU existence) Most existing studies focus only on these performance measures However, we consider some additional measures that represent the performance of CR systems ... exploiting CSC [6] The performance results for these two schemes are obtained by using simulation In simulation, the scheme with quiet period performs the energy detection for the entire band of ... scheme for cognitive radio systems, ” IEEE Transactions on Wireless Communications, vol 7, no 2, pp 505–509, 2008 [4] S S Jeong, W S Jeon, and D G Jeong, “Dynamic channel sensing management for OFDMA-based...

Ngày tải lên: 21/06/2014, 05:20

... range of performance results for all the MUD schemes considered in this contribution PERFORMANCE RESULTS In this section, we show a range of BER performance results for the MC DS-CDMA systems using ... and Networking MRC Zero-forcing − Rc CT y11 HH 11 x1 ··· yu1 Zero-forcing − Rc CT HH u1 yu2 Zero-forcing − Rc CT HH u2 xu ··· Zero-forcing − Rc CT yup HH up ··· Zero-forcing − Rc CT yqp HH qp ... diagram for implementation of the SZF-MUD in MC DS-CDMA systems combined in order to form a final decision variable Specifically, when the SZF-MUD following this design philosophy is considered, for...

Ngày tải lên: 22/06/2014, 19:20

... even for single antenna When we increase the number of antenna elements, the performance of the CZF-EGC tends to the CZF performance, even for fullload system The simulation results for the beamforming ... that for a single antenna, the CZF algorithm performance outperforms the one obtained with conventional receiver equalizers for number of users up to 16 (half load) Beyond this point the performance ... algorithms, but for CZF-EGC case we just perform the amplitude equalization at transmitter side, while for CZF we perform amplitude and phase equalization We can even see that the performance is...

Ngày tải lên: 23/06/2014, 00:20

... efficiency measure Channel/MHz is suitable for point-to-point radio communications or one cell mobile radio systems, it is not adequate for cellular land mobile radio systems 2.3.4 Erlangs/MHz In this ... power is vital for simple amplitude demodulation Signal to noise performance of AM systems The signal to noise performance of AM systems can be derived in a similar fashion as for DSB systems Only ... and relatively cheap radio equipment which has led to the rapid expansion in the use of land mobile radio systems Land mobile radio systems are now becoming so popular, for both business and...

Ngày tải lên: 03/07/2014, 21:45

Ngày tải lên: 04/07/2014, 03:55

... MM-Wave Fibre -Radio .….…….45 2.3.2 Wavelength Interleaved MM-Wave Fibre -Radio …………………….48 2.4 IMPAIRMENTS IN WDM MM-WAVE FIBRE -RADIO 52 2.5 MODULATION DEPTHS OF MM-WAVE FIBRE -RADIO LINKS ... for the delivery of a variety of broadband fixed radio access and mobile services with the frequency bands allocation of 28 GHz for the Local Multipoint Distribution Services (LMDS), 40 GHz for ... incorporating mm-wave radio transmission requires a microcell or picocell which brings forth the needs for a large number of remote antenna BSs within a small geographical area [19-21] Therefore, to make...

Ngày tải lên: 06/08/2014, 00:21

... communication systems, ” Computer Networks and ISDN Systems, vol 20, pp 447-454, 1990 [32] M Berg, S Pettersson, and J Zander, “ A radio resource management concept for bunched personal communication systems, ... and transmitted radio signals Fig 2.2 shows the generic BS architecture that enables BBover-fibre transport scheme for mm-wave fibre -radio systems As shown in the Fig 2.2, the radio signal in ... (mm-wave) fibre -radio systems are developed to meet the future bandwidth requirements for broadband wireless access (BWA) in ‘last mile’ communication A generic architecture of mm-wave fibre -radio network...

Ngày tải lên: 06/08/2014, 00:21

... network for mmwave fibre -radio systems feeder networks in mm-wave fibre -radio systems may surprisingly increase the capacity of the systems by supporting huge number of BSs required for future ... wavelength-interleaved optical mm-wave channels in a DWDM feeder network for mm-wave fibre -radio systems (WI) techniques in the fibre -radio systems, by which 50 GHz or 25 GHz channel separated fibre optic ... “Passive picocell-an unpowered remote transceiver for short range, high capacity radio systems, ” IEE Colloquium on Fibre Optics in Microwave Systems and Radio Access, London, UK, pp 14/1-4, 1997 [72]...

Ngày tải lên: 06/08/2014, 00:21

... OPTICAL INTERFACE FOR SIMPLIFIED ANTENNA BASE STATIONS 3.1 Introduction In mm-wave fibre -radio systems multiple remote antenna base stations (BSs), suitable for untethered connectivity for the broadband ... simplified architectures in mm-wave fibre -radio systems The filtering requirements of the OADMs for the implementation of WI-DWDM mm-wave fibre -radio systems are described in Section 3.3 This ... fibre -radio systems to the WI-DWDM fibre-feeder networks by dropping and adding the desired signals, in addition to providing the optical carrier for the uplink path, which simplifies the systems...

Ngày tải lên: 06/08/2014, 00:21

... communication systems, ” Computer Networks and ISDN Systems, vol 20, pp 447-454, 1990 [19] M Berg, S Pettersson, and J Zander, “ A radio resource management concept for bunched personal communication systems, ... “Passive picocell-an unpowered remote transceiver for short range, high capacity radio systems, ” IEE Colloquium on Fibre Optics in Microwave Systems and Radio Access, London, UK, pp 14/1-4, 1997 [31] ... FBGs for fiber -radio systems, ” J Lightwave Technol., vol 21, pp 32-39, 2003 [67] C Marra et al., “OADM with a multiple phase-shifted FBG for a wavelength-interleaved millimeter-wave fiber-radio...

Ngày tải lên: 06/08/2014, 00:21

... Experimental setup for the evaluation of the performance of modified WDM optical interface enabling performance improvement of the link, both in downlink and uplink direction, for a WI-DWDM fibre -radio system ... modulation depths [20, 56] These shortcomings in mm-wave fibre -radio systems result in very poor sensitivities for the detected mm-wave fibre -radio signals, which need to be overcome by further explorations ... signal and recovering greater optical carrier for the uplink path, while performing optical add-drop functionality for a wavelength-interleaved DWDM fibre -radio system This problem can be resolved...

Ngày tải lên: 06/08/2014, 00:21

... suitable multiplexers for WI-DWDM mm-wave fibre -radio systems A novel wavelengthinterleaved-multiplexer (WI-MUX) with the mechanism for enhancing modulation depth indices for such systems is presented ... communication systems, ” Computer Networks and ISDN Systems, vol 20, pp 447-454, 1990 [55] M Berg, S Pettersson, and J Zander, “ A radio resource management concept for bunched personal communication systems, ... Performance Incorporating WDM Optical Interface 4.10 References [1] M Bakaul, A Nirmalathas, and C Lim, “Dispersion Tolerant Novel Base Station Optical Interface for Future WDM Fiber -Radio Systems, ”...

Ngày tải lên: 06/08/2014, 00:21

... Interleaving Scheme for Multi-Sector Antenna Base Station Due to line-of-sight requirements associated with mm-wave radio systems, base stations with multiple sectors are often required, for example ... Millimetre-Wave Fibre -Radio Networks baseband data was recovered using a 2.5 GHz electronic phase locked loop (PLL) Fig 5.12 shows the measured bit error ratio (BER) curves for the recovered signal for the ... the overall link performance by 7.2 dB From the BER curves it can also be seen that, the sensitivity of the signal for the first LB is improved by approximately dB, whereas for the third loop-back...

Ngày tải lên: 06/08/2014, 00:21

... FBGs for fiber -radio systems, ” J Lightwave Technol., vol 21, no 1, pp 32-39, 2003 [33] C Marra et al., “OADM with a multiple phase-shifted FBG for a wavelength-interleaved millimeter-wave fiber -radio ... system technologies for WI-DWDM mmwave fibre -radio systems 5.9 Conclusion This chapter presented novel system technologies incorporating arrayed waveguide grating filters for future wavelength-interleaved ... demultiplexing scheme for wavelength-interleaved DWDM millimeter-wave fiber -radio 238 Chapter 5: Enabling Wavelength Interleaving in Millimetre-Wave Fibre -Radio Networks systems , in Proc International...

Ngày tải lên: 06/08/2014, 00:21

... schemes for the integration of mm-wave fibre -radio systems to the optical access infrastructure were developed Chapter presented a comprehensive review of the research in mm-wave fibreradio systems ... spectrally efficient fibre -radio feeder network, with particular focus on WI-DWDM systems, was presented Literatures reporting the performance enhancement of mm-wave fibre -radio systems were reviewed ... system technologies for the implementation of dense-wavelength-division-multiplexed (DWDM) millimetre-wave (mm-wave) fibre -radio systems, which also includes the integration of these systems to the...

Ngày tải lên: 06/08/2014, 00:21

... suitable for this paper is the distinguishing between formal and informal institutions The examples of formal institutions are written laws and governmental regulations while examples of informal ... This makes Thailand a good location for utilizing PV systems The affordability challenge is more complex Historically prices for producing electricity with PV systems have not been competitive ... components The relevant type of linkage for this paper is interaction linkage between different actors [17] We separate it to formal and informal linkages By saying formal, we mean that it is an established...

Ngày tải lên: 05/09/2013, 16:10

... enforcing the lock at write time, for all writers, can be done using a trigger: CREATE TRIGGER tg_EnforceCustomerLocks ON Customers 249 CHAPTER DESIGNING SYSTEMS FOR APPLICATION CONCURRENCY FOR ... amount of profile form duplication as well as the fact that many of the forms are filed in the wrong order It would be a huge waste of time for the data input operators if, for instance, one ... DESIGNING SYSTEMS FOR APPLICATION CONCURRENCY Unfortunately, this approach is fraught with issues The first and most serious problem is that between the query in the IF condition that tests for the...

Ngày tải lên: 05/10/2013, 08:48

... Table 3.4 This information is similar to the information presented for a food ingredient/nutraceutical petition for FDA self-afÞrmed Generally Recognized as Safe (GRAS) status or for a health claim ... consume caffeine for performance Although sport beverages were originally designed for very competitive amateur and professional athletes, they are widely accepted as energy boosters for the average ... common tag line for these products is “Stimulation for Body and Mind.” The term stimulator beverage was chosen for this review rather than the more common terms of energy drink or performance enhancer...

Ngày tải lên: 25/10/2013, 21:20

... Building Training Systems for the Global Workplace For over four decades, Lab-Volt has provided state-ofthe-art systems for technician training in the basic and most ... responsible for typographical errors TELECOMMUNICATIONS Technical Training Systems Known for Excellence in Technical Training Introducing Lab-Volt’s Award-Winning Training Systems for Analog & Digital ... in modern communications systems The Reconfigurable Training Module, Model 9431-1, used in the 8087 System is the same platform used for many other Lab-Volt Training Systems, such as the 8086...

Ngày tải lên: 06/11/2013, 11:15

... emphasis on developing modern cost management systems for its manufacturing plants Therefore, the manufacturing plants lacked the cost management information that was needed to support the improvement ... Activity-Based Cost Systems for Management In some instances, a company may question whether the time spent in packaging is value-added Packaging is essential for some products but unnecessary for others ... (June 1989), p 63 For additional information, see Mike Walker, “Attribute Based Costing,” Australian Accountant (March 1992), pp 42–45 147 Chapter Activity-Based Cost Systems for Management DETERMINING...

Ngày tải lên: 18/12/2013, 09:12