DS-CDMA spread spectrum systems
Narrow-Band Interference Suppression in CDMA Spread-Spectrum Communication Systems Using Pre-Processing Based Techniques in Transform-Domain
... In this paper, we propose two pre-processing based methods in unitary transform-domain for narrow-band interference rejection in direct-sequence code-division multiple access (DS-CDMA) systems. On ...
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Particle Filtering for Joint Symbol and Code Delay Estimation in DS Spread Spectrum Systems in Multipath Environment
... for DS spread spectrum systems in multipath ...multiuser DS-CDMA transmission, using the techniques proposed in [24], for example, or ...
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ADAPTIVE CODE TO USER ALLOCATION FOR INTERFERENCE MANAGEMENT ON THE DOWNLINK DS-CDMA SYSTEMS
... (DS) Spread Spectrum is often claimed to have particular properties that makes it less vulnerable to multipath ...in CDMA systems for two reasons, the 1st reason is inter-symbol ...
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Effect of length on Correlation of PN sequence and Gold sequence
... interference-limited CDMA technology for mobile cellular ...in CDMA Environment” the performance of BPSK and 8-PSK in Code Division Multiple Access (CDMA) environment by using Cyclic Codes as the ...
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Using chaotic sequence in direct sequence spread spectrum based on code division multiple access (DS CDMA)
... chaotic systems on their initial conditions, a large number of uncorrelated, random-like, deterministic and reproducible signals can be ...the DS-CDMA downlink ...for DS-CDMA system ...
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Modeling and Simulation of CDMA Codes in Scilab
... Prior to hardware implementation, simulation is an important step in the study of systems such as Direct Sequence Code Division Multiple Access (DS-CDMA). A useful technique is presented, al- lowing ...
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Blind Multiuser Detection by Kurtosis Maximization for Asynchronous Multirate DS/CDMA Systems
... ultra-wideband systems) due to e ffi cient spectrum utilization, release from frequency man- agement, low mobile station’s transmit power through power control [1], and high multipath resolution, and so forth ...
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Differential Space Time Block Code Modulation for DS CDMA Systems
... the spread spectrum technology to propose a new modulation scheme to improve the performance of DS-CDMA systems in fast time-dispersive fading ...for DS-CDMA ...
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Binary De Bruijn sequences for DS CDMA systems: analysis and results
... for spread spectrum purposes, such as Maxi- mal-length sequences (m-sequences), Gold, and Kasami ...of CDMA systems, the most remarkable property is the two valued auto-correlation profile ...
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Performance Analysis of Multi User Detectors for Synchronous DS CDMA Systems
... Spread spectrum can also be used as a mechanism for many users to share the same ...same spread bandwidth is also called spread-spectrum multiple access (SSMA), which is a special case ...
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Adaptive Rate DS CDMA Systems using Variable Spreading Factors
... demodulation, spread-spectrum communications and multiuser detection, pseudonoise (PN) code synchronization, smart antennas, and adaptive wireless systems, as well as wide-band, broad-band, and ...
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A resource allocation approach to control interference in Multi Carrier DS CDMA systems
... Multi-carrier spread spectrum can be realized using two ...MC- CDMA which is a referred to as CDMA-OFDM and second is ...same spectrum at the same time and the separation of the user ...
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Exploring the reconfigurability options of multi carrier CDMA in cognitive radio systems
... multi-carrier spread spectrum sys- tems are the MC-CDMA (frequency domain spreading) and MC direct sequence CDMA (MC-DS-CDMA) (time domain ...of CDMA and OFDM, resulting ...
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Ber Improvement Of Ds-Cdma For Awgn And Rayleigh Fading Channel With Kasami Code
... In CDMA systems, all users transmit the data in the same bandwidth simultaneously and communication systems following this concept are said to be "spread spectrum systems'' ...
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Enabling dynamic spectrum access using SS MC CDMA
... By combining frequency domain and time domain dispersal of modulated symbols, two main variants of multi-carrier spread spectrum systems, the MC-CDMA and MC direct sequence CDMA MC-DS-CD[r] ...
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Nonlinear Multiuser Receiver for Optimized Chaos-Based DS-CDMA Systems
... of CDMA applications, the network learns the association between the input vector and the desired response in training ...of DS-CDMA system such as the code sequence matrix (S) and user amplitude ...
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Single and Multi Carrier DS CDMA: Multi USer Detection, Space Time Spreading, Synchronisation, Standards and Networking
... Third-Generation Systems and Intelligent Wireless Networking: Smart Antennas and Adaptive Modulation, John Wiley - IEEE Press, 2002, p408 ...TDMA, CDMA and OFDM systems, John Wiley - IEEE Press, ...
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Coherent Code Tracking for Spatial Transmit Diversity DS-CDMA Systems
... (DS- CDMA) communications, antenna diversity techniques have been proposed and implemented to mitigate the effects of multipath fading [1, ...that CDMA-based systems are able to exploit and ...
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Spectrum Sharing in an ISM Band: Outage Performance of a Hybrid DS/FH Spread Spectrum System with Beamforming
... Radio frequency (RF) has become one of the most precious resources with the booming usage of wireless applications in the recent years. Licensing radio frequencies for commercial use has long been the mechanism adopted ...
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Accurate BER Analysis of Asynchronous DS CDMA Systems in Ricean Channels
... The organization of this paper is as follows. In Section II an asynchronous DS-CDMA system using BPSK modulation is considered in the context of a Ricean fading channel. Then in Section III an accurate BER ...
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