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  • Articles  (8)
  • CDMA  (8)
  • 2000-2004  (8)
  • Electrical Engineering, Measurement and Control Technology  (8)
  • Technology
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  • Articles  (8)
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  • Electrical Engineering, Measurement and Control Technology  (8)
  • Technology
  • Computer Science  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Spread Spectrum Technique to Improve the Performance of Radio over Fibre for Microcellular GSM Networks (2000)
    Springer
    Wireless personal communications 14 (2000), S. 133-146 
    Details
    ISSN: 1572-834X
    Keywords: radio over fibre ; microcellular networks ; CDMA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper presents a GSM-specific assessment of the performance of a radioover fibre link between a remote antenna unit and GSM base station. Theintermodulation distortion (IMD) has been analysed for a system using thesubcarrier multiplexing (SCM). A novel technique using direct sequence spreadspectrum is proposed to minimize the IMD by decreasing the signal amplitudeprior to a direct modulation of a laser diode. The results show that theoptical fibre microcellular is outperforming the full wireless system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008957200405
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  • 2
    Electronic Resource
    Electronic Resource
    Implementation of the Decorrelating Receiver for Asynchronous DS-CDMA Systems over Multipath Fading Channels (2000)
    Springer
    Wireless personal communications 15 (2000), S. 79-95 
    Details
    ISSN: 1572-834X
    Keywords: CDMA ; multiuser detection ; multipath fading channel ; decorrelating detector
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper presents a decorrelating detector for DS-CDMAasynchronous systems over multipath fading channels. The decorrelatingreceiver applies the inverse correlation matrix of signature waveformsto detect the received signal. A procedure for finding such an inversematrix is developed. This procedure employs the reciprocal basis,derived from the basis of normalized user signatures, to cancelsimultaneously both the multiuser and the intersymbolinterference. The proposed multiuser detector operates over a finitedetection window, and the only restriction imposed on the set of signaturesis that the signatures must be independent at the receiver end. If the channelis slowly variant, the detectorcan be very efficient for high bit rate transmissions. Theoreticalbounds for the multiuser interference are obtained. Simulationresults, in which both binary and non-binary sequences are used,reveal that the behaviour of the detector approaches the single userbound when an adequate set of signatures is employed. The reducedcomplexity of this detector indicates that it could be a good candidatefor practical implementation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008959121461
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  • 3
    Electronic Resource
    Electronic Resource
    Proposal of Novel Optical Polarity-Reversing Correlator for Optical CDMA Radio Highway Network (2000)
    Springer
    Wireless personal communications 14 (2000), S. 103-123 
    Details
    ISSN: 1572-834X
    Keywords: radio highway ; CDMA ; optical polarity reversed correlator ; bipolar code sequence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper proposes a new optical polarity-reversing correlator for opticalCDMA radio highway network. We theoretically analyze thecarrier-to-interference-plus-noise power ratio of regenerated radio signal atthe control station. Analysis results clarify that optical CDMA using bipolarcode sequences can be applied to the fiber-optic link of radio highway and wecan assign more distinct code sequences to radio base stations compared withthe unipolar type correlator using prime codes. By the proposed opticalpolarity-reversing correlator using Gold codes, thecarrier-to-interference-plus-noise ratio can be more improved than theunipolar type correlator using prime codes. It is also found that for smalltransmitted optical peak power, the proposed optical polarity-reversingcorrelator using Gold codes can improve the number of maximum connected radiobase stations much more compared with the unipolar type correlator using primecodes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008949128610
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  • 4
    Electronic Resource
    Electronic Resource
    The Complex Bootstrap Algorithm for Blind Separation of QAM Multiuser CDMA Signals (2000)
    Springer
    Wireless personal communications 12 (2000), S. 1-14 
    Details
    ISSN: 1572-834X
    Keywords: interference cancellation ; CDMA ; multiuser detection ; adaptive receivers ; QAM modulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The bootstrap separator for multiuser signals is principally composed of cancelers, each one using the output of the other cancelers to facilitate control of its adaptive weight. In fact, such a structure performs as a “signal separator” rather than an interference canceler. Since for its separation there is no need for a reference signal (as in LMS cancelers), it is sometimes justifiably called a “Blind Separator”. However, for its operation the bootstrap separator requires a signal distinguisher termed “discriminator”. The algorithm was used in the past in applications such as dually polarized satellite communications and microwave terrestrial links. It was particularly reported for multiuser CDMA signal separating, with the signum function as discriminator. Especially for QAM signals, complex presentation is important. Therefore, we will concentrate in this report on what we call the “Complex Bootstrap Algorithm”. It is an extension to the previously reported bootstrap structure of [5]. We will examine its performance and emphasize the hardware saving in its implementation, and the ease of using it in simulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008804108879
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  • 5
    Electronic Resource
    Electronic Resource
    Low Power Rake Receiver and Viterbi Decoder Design for CDMA Applications (2000)
    Springer
    Wireless personal communications 14 (2000), S. 49-64 
    Details
    ISSN: 1572-834X
    Keywords: low power design ; Rake receiver ; Add-Compare-Select unit ; Viterbi decoder ; CDMA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract In this paper, we address the issues of designing lowpower VLSI implementation of the Code DivisionMultiple Access (CDMA) receiver. Among all the digitalfunctional blocks of a CDMA receiver, the RAKEreceiver and the Viterbi decoder are the mostcomputational intensive and hence consume most of thepower. In this work, we propose new VLSI architecturesfor these two functional blocks which consumesignificantly lower power. In particular, were-organize the structure of the pilot-aided RAKEdemodulator to reduce the operational frequency of thearithmetic components and we propose a newAdd-Compare-Select (ACS) architecture for the Viterbidecoder which can reduce the complexity of thecomputation. Also a novel pre-computationalarchitecture is proposed to further reduce the powerconsumption of the ACS unit. Experimental results showsignificant reduction in power consumption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008961028130
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  • 6
    Electronic Resource
    Electronic Resource
    A Protocol for Multimedia CDMA Personal Communication Networks (2000)
    Springer
    Wireless personal communications 14 (2000), S. 275-301 
    Details
    ISSN: 1572-834X
    Keywords: protocol ; MAC ; CDMA ; multimedia ; personal communication networks
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract In this paper, a joint CDMA/TDMA protocol has been proposed for integratedvideo-phone/voice/data traffic in personal communication networks (PCN). Thevideophone service is implemented according to H.261 standard. The concept ofdynamic boundary is adopted in both code and time domains to meet thedifferent requirements for videophone, voice and data traffic.Two mathematical analysis methods are adopted to evaluate the systemperformance. One is the traditional Markov analysis (TDMA), which is used tocalculate the average videophone and voice call blocking probabilities. Theother is Transient Fluid Analysis (TFA), which is adopted to evaluate the datadelay and channel utilization performance. Results show that two dynamicboundaries can be adjusted to achieve the optimal system performance, andsuggestions of how to adjust these boundaries are also given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008992016471
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  • 7
    Electronic Resource
    Electronic Resource
    Differentially Coherent Blind Adaptive Receiver for Rayleigh Fading CDMA Channels (2000)
    Springer
    Wireless personal communications 15 (2000), S. 11-29 
    Details
    ISSN: 1572-834X
    Keywords: CDMA ; blind interference cancellation ; multiuser detection ; multipath fading channel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Interest in code division multiple access (CDMA) has increased dramaticallyin boththe industry and academia. This is due to the potential increase in usercapacity andinterference, multipath fading, and jam-resistant capabilities. Differentapproaches ofmultiuser detection schemes have shown improvement over the conventionalreceiver.However, multiuser detectors require system parameters and adaptive multiuserreceivers require training sequences. These parameters are difficult toobtain inmultipath fading channels with a degradation in performance. A blind adaptivemultiuser receiver for flat fading and frequency-selective fading environments isstudied in this paper. This receiver alleviates the problem of multiuser detectors and adaptivemultiuser receivers by using a blind adaptive equalization method. The structure of the receiveris similar to that of the adaptive MMSE receiver which consists of an adaptive equalizer and an adaptivemechanism that uses a standard least mean-squared (LMS) algorithm, but uses a matched filterto generate a reference signal. The receiver is shown to be effective in different fadingchannels with perfect power control and a near-far effect. Furthermore, the simulationresults show that the blind MMSE receiver outperforms the conventional receiver and theRAKE receiver.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008903502037
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  • 8
    Electronic Resource
    Electronic Resource
    A Novel Direct Sequence Spread Spectrum CDMA System with Analog Frequency Modulation (2000)
    Springer
    International journal of wireless information networks 7 (2000), S. 43-53 
    Details
    ISSN: 1572-8129
    Keywords: Frequency modulation ; direct sequence spread spectrum ; CDMA ; wireless local loop
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper describes and analyzes a unique combination of analog modulation with code division multiple access. Although the capacity of the analog CDMA system is less than that of the digital CDMA, the analog system has reliable voice quality, economy and ease of implementation, simplified frequency planning, and compatibility with current analog phone systems and devices, which is an especially attractive feature. The FM CDMA system is proposed as a fixed wireless system, e.g., wireless local loop, in which the small scale fading distortion due to Doppler effect is likely to be moderate. This allows the use of simple and cost-efficient receiver structures while maintaining performance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009592101249
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