code-spread CDMA systems
Effect of Length on Correlation of PN Sequence and Gold Sequence
... ABSTRACT: Spread spectrum modulation technique is different from the conventional communication ...of spread spectrum communication systems intern CDMA (code division multiple access ...
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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'' so in ...
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Binary De Bruijn sequences for DS CDMA systems: analysis and results
... them, code division multiple access (CDMA) using direct sequence (DS) spread spectrum modulation is widely recognized as an efficient solution to allow uncoordinated access by several users to a ...
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Using chaotic sequence in direct sequence spread spectrum based on code division multiple access (DS CDMA)
... DS-CDMA systems offer physical layer security without the need for a significant increase in computation or power ...DS- CDMA has been used widely. These systems suffers from multiple access ...
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A Chip Level BSOR Based Linear GSIC Multiuser Detector for Long Code CDMA Systems
... cellular systems is that the latter are long-code systems while most multiuser detectors developed until now assume a short-code system ...the spread- ing codes directly and thus avoid ...
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PAPR Reduction Using PSO-GSA Tuned PTS Techniques in MC-CDMA System
... Multicarrier systems such as Orthogonal Frequency Division Multiplexing (OFDM) and Multi Carrier Code Division Multiple Access (MC-CDMA) are considered to be the promising technologies for 4G ...
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Joint Performance Study of Channel Estimation and Multiuser Detection for Uplink Long Code CDMA Systems
... uplink CDMA system, where each user transmit BPSK signals through a respective multipath channel, whose parameters are randomly gener- ated with equal power for each path according to Gaussian ...delay ...
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Spreading Code Assignment Strategies for MIMO CDMA Systems Operating in Frequency Selective Channels
... wideband CDMA systems ...to spread users’ data and one scrambling code per user to distinguish ...MIMO-CDMA systems that assign all users the same set of Hadamard sequence along ...
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Modeling and Simulation of CDMA Codes in Scilab
... of systems such as Direct Sequence Code Division Multiple Access ...Gold Code Generator for Global Positioning System ...by spread spectrum ...
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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 interference ...
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Super-Orthogonal Space-Time Turbo Transmit Diversity for CDMA
... sequence code-division multiple-access (CDMA) systems is ...super-orthogonal code-spread CDMA is married with code-division transmit diversity ...turbo ...
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Blind Multiuser Detection for Long Code CDMA Systems with Transmission Induced Cyclostationarity
... 3G CDMA systems by using multicode (MC) or variable spreading factor ...MC systems, the symbols of a high- rate user are subsampled to obtain several symbol streams, and each stream is regarded as ...
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Effect of length on Correlation of PN sequence and Gold sequence
... : Spread spectrum modulation technique is different from the conventional communication ...of spread spectrum communication systems intern CDMA (code division multiple access ...
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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 in better ...
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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 ...block code modulation for DS-CDMA ...
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Multipass Channel Estimation and Joint Multiuser Detection and Equalization for MIMO Long Code DS/CDMA Systems
... Direct-sequence code-division multiple-access (DS/CDMA) techniques are of considerable interest, since they are among the basic technologies for the realization of the air inter- face of current and future ...
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Multiple Access Technologies for Beyond 3G Wireless Cellular Systems
... mind, code-division multiple access (CDMA) schemes based on spread spectrum technology started to come into commercial systems, different from their original environment mainly in military ...
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Fractionally Spread Multicarrier CDMA: A Multiple Access Scheme for Various Wireless Channels
... multicarrier code-division multiple-access (MC- CDMA) the total system bandwidth is divided into a number of subbands, where each subband may use direct-sequence (DS) spreading and each subband signal is ...
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Computationally Efficient Blind Code Synchronization for Asynchronous DS CDMA Systems with Adaptive Antenna Arrays
... communication systems have been used successfully in military applications for several ...(DS) code-division multiple access (CDMA), a specific form of spread-spectrum transmission, has become ...
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Multicarrier Block Spread CDMA for Broadband Cellular Downlink
... combine CDMA with OFDM have recently gained increased momen- tum as candidate air interface for future broadband cellu- lar systems ...the CDMA and the OFDM component in the transmission ...MT-DS- ...
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