A/DS-CDMA
Performance Evaluation of a DS CDMA System in a Rayleigh Fading Environment
... The objectives of the current research work were: 1 To study a Direct Sequence Code Division Multiple Access DS-CDMA system in a Rayleigh fading channel, 2 To carry out the analysis for [r] ...
9
DS-CDMA Receiver Based on a Five-Port Technology
... 4. FIVE-PORT-DEVICE-BASED RAKE RECEIVERS So far we have seen that it is possible to design a DS-CDMA receiver with analog despreading and direct conversion us- ing five-port device. The same approach can be ...
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BER performance of MC DS CDMA systems in the presence of timing jitter : a thesis presented in partial fulfillment of the requirements for the degree of Master of Engineering in Information and Telecommunication Engineering at Massey University, Palmerston North, New Zealand
... system suffers severely from a clock frequency offset between the transmitter and the receiver. In [39], the effect of timing jitter on MC-DS-CDMA was studied in terms of signal-to-noise ratio (SNR) ...
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A Joint Optimization Criterion for Blind DS-CDMA Detection
... Direct-sequence code-division multiple access (DS-CDMA) is a common technique in mobile communications that com- plements other preexisting access techniques such as TDMA or FDMA [1–7]. In systems that use ...
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A Unified Exact BER Performance Analysis of Asynchronous DS CDMA Systems Using BPSK Modulation over Fading Channels
... Abstract— An asynchronous binary DS-CDMA system using random spreading sequences is considered when communicating over various fading channels. New closed-form expressions are derived for the conditional ...
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A Unified Approach to the Analysis of Multicarrier DS CDMA over Nakagami $M$ Fading Channels
... MC DS-CDMA schemes in terms of m = 1, 2 and ∞ ...multitone DS-CDMA outperforms orthogonal MC ...MC DS-CDMA outperforms multitone ...MC DS-CDMA schemes are ...
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Performance and Analysis of DS-CDMA Rake Receiver and Analyzing the BER Performance in Presence of Nonlinear Distortion in DS-CDMA System
... in which the receive signal is multiplied by time-shifted versions of a locally generated code sequence. The intention is to separate signals such that each finger only sees signals coming in over a single (resolvable) ...
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Performance and Analysis of DS CDMA Rake Receiver
... The rake receiver [3, 6] consists of multiple correlators, in which the receive signal is multiplied by time-shifted versions of a locally generated code sequence. The intention is to separate signals such that each ...
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Exploring the reconfigurability options of multi carrier CDMA in cognitive radio systems
... a DS-CDMA system, upon receiving a trigger as a read-out from the chan- nel map, the system’s decision block decides to switch to a multi-carrier system and an IFFT block is added to provide the ...
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An Iterative Multiuser Detector for Turbo-Coded DS-CDMA Systems
... users. This is equivalent to the K -symmetric channel that was discussed in [19] and used in [11, 20, 21]. The K- symmetric channel model permits the comparison of per- formance of receivers with changes in ...
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Blind Identification of Out of Cell Users in DS CDMA
... cellular DS-CDMA systems, interference can be classified as either (i) interchip (ICI) and intersymbol (ISI) self-interference, (ii) in-cell mul- tiuser access interference (commonly referred to as MUI or ...
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Generalized Multicarrier DS CDMA Using Various Chip Waveforms
... single-carrier DS-CDMA associated with λ = 0 achieved the best BER ...MC DS-CDMA systems using any of the three chip waveforms studied achieved a similar BER ...
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Interference Free Broadband Single and Multi Carrier DS CDMA
... in DS-CDMA predetermines the properties of the ...multicarrier DS-CDMA proportionately to the number of ...MC DS-CDMA system is capable of exhibiting near- single-user ...
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Performance of Generalized Multicarrier DS CDMA over Nakagami $m$ Fading Channels
... multitone DS-CDMA, then a subcarrier signal will overlap with a high number of subcarrier signals of both the same user and with those of the interfering ...
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Design and Performance Analysis of an Adaptive Receiver for Multicarrier DS CDMA
... In this paper, an adaptive parallel interference cancela- tion (APIC) scheme is proposed for the MC-DS-CDMA sys- tem, in which the frequency diversity inherent in the MC sys- tem is exploited through ...
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Performance of Generalized Multicarrier DS CDMA Using Various Chip Waveforms
... In this letter, we extend our investigations presented in [1] by considering two additional chip waveforms, namely, the time- domain half-sine and raised-cosine chip waveforms, in addition to the rectangular chip ...
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Blind Reduced Rank MMSE Detector for DS CDMA Systems
... for DS-CDMA and briefly introducing the linear MMSE detector, we derive a reduced- rank MMSE detector which lies in a specific subspace of the signal ...
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Subband Adaptive Array for DS CDMA Mobile Radio
... We propose a novel scheme of subband adaptive array (SBAA) for direct-sequence code division multiple access (DS-CDMA). The scheme exploits the spreading code and pilot signal as the reference signal to ...
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Blind linear multiuser detection for DS-CDMA wireless networks
... A new blind code acquisition scheme for DS-CDMA system based on a linearly constrained CMA has been proposed. This method exploits its lock conver gence behaviour such that the correct delay hypothesis is ...
221
Blind chip-rate equalisation for DS-CDMA downlink receiver
... The adaptation algorithm is based on a constant modulus criterion forcing the various user symbols onto a constant modulus, for which a stochastic gradient descent algorithm is derived..[r] ...
6