DS/CDMA systems
Binary De Bruijn sequences for DS CDMA systems: analysis and results
... This article presented some results about the application of binary De Bruijn sequences in DS-CDMA systems, as user spreading codes. Binary De Bruijn sequences fea- ture great cardinality of the ...
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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 [2– ...
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Nonlinear Multiuser Receiver for Optimized Chaos-Based DS-CDMA Systems
... in DS-CDMA systems is proposed and novel method based on radial basis function (RBF) for both blind and non-blind multiuser detection in chaos-based DS-CDMA systems is derived ...
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Accurate BER Analysis of Asynchronous DS CDMA Systems in Ricean Channels
... Ricean-faded DS-CDMA systems using random spreading [2]–[17], [19], [20] sequences is still an open ...asynchronous DS-CDMA systems in a Ricean fading environment, which requires ...
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Equivalence of Linear MMSE Detection in DS CDMA and MC CDMA Systems over Time and Frequency Selective Channels
... (CDMA) systems in time and frequency selective ...different CDMA systems as special ...different CDMA systems operating over purely frequency selective and purely time selective ...
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ADAPTIVE CODE TO USER ALLOCATION FOR INTERFERENCE MANAGEMENT ON THE DOWNLINK DS-CDMA SYSTEMS
... In CDMA systems interference is the major ...of DS-CDMA systems in Additive White Gaussian noise (AWGN) ...the CDMA transmitter and receiver algorithm for both Adaptive code ...
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An Iterative Multiuser Detector for Turbo-Coded DS-CDMA Systems
... We propose an iterative multiuser detector for turbo-coded synchronous and asynchronous direct-sequence CDMA (DS-CDMA) systems. The receiver is derived from the maximum a posteriori (MAP) ...
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Adaptive Rate DS CDMA Systems using Variable Spreading Factors
... of DS-CDMA systems can be increased when the conventional matched-filter-based receiver is em- ...single-cell DS-CDMA system, where the number of active mobile users obeys the Poisson ...
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Minimum BER Receiver Filters with Block Memory for Uplink DS CDMA Systems
... SISO systems and no transmitter filter was ...a DS-CDMA system has been studied for blind equalization in [13], and the problem of CDMA receiver design has also been studied in [14], however, ...
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Differential Space Time Block Code Modulation for DS CDMA Systems
... Note that besides the Rake type combination of the de- layed versions from each path, the D-Det receiver exploits the known information of the spreading sequences as well as their delayed paths deterministically. Hence ...
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Performance Analysis of Multi User Detectors for Synchronous DS CDMA Systems
... conventional systems utilized either frequency spectrum sharing or timesharing and henceforth there was the restriction on the ...hence CDMA, fixed bandwidth was utilized to oblige numerous users by ...
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Exact BER Calculation of Asynchronous DS CDMA Systems Communicating over Hoyt Channels
... of DS-CDMA systems is assuming that the multiple access interference (MAI) is Gaussian distributed or conditional Gaussian dis- tributed based on the Central Limit Theorem ...
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A Unified Exact BER Performance Analysis of Asynchronous DS CDMA Systems Using BPSK Modulation over Fading Channels
... asynchronous DS- CDMA systems using BPSK modulation for transmissions over Rayleigh, Ricean, Hoyt and Nakagami- m fading ...asynchronous DS- CDMA system using BPSK modulation and ...
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Ant Colony Based Multiuser Detection for MC DS CDMA Systems
... (MC DS- CDMA) ...MC DS-CDMA search space constituted by all possible combinations of the received multi-user ...MC DS-CDMA system employing 31 -chip Gold codes as the T-domain ...
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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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A resource allocation approach to control interference in Multi Carrier DS CDMA systems
... SCRAP is a NP-hard problem and can be solved using solving procedure of classical Multiple choice Knapsack problem (MCKP)[15].MCKP can be expressed as follows given an item set which in turn divided into a finite subsets ...
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Blind Soft Detection Assisted Frequency Hopping Multicarrier DS CDMA Systems
... 3, for the SFH/MC DS-CDMA system using a constant-weight code CQ; 2v; U in order to activate the subcarriers and using a receiver without the explicit knowledge of the FH pattern - exce[r] ...
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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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Performance of Cellular DS CDMA Systems Using Distributed Antennas
... BER versus coordinates x, y performance of the distributed antenna cellular DS-CDMA system supporting single user, when the user signal experiences pass-loss, lognormal shadowing slow fa[r] ...
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THE THROUGHPUT FOR MULTI HOP RELAY WIRELESS SENSOR NETWORKS BASED ON COOPERATIVE DIVERSITY
... of DS-CDMA systems over Rayleigh, Rician and AWGN fading channel, in the case of the channel being known at the receiver ...STBC CDMA system has increased performance in cellular networks We ...
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