multi-code DS/CDMA systems
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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Binary De Bruijn sequences for DS CDMA systems: analysis and results
... a DS- CDMA receiver to detect the desired signal relies to a great extent on the auto-correlation properties of the spreading code associated to each user; on the other hand, multi-user ...
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Interference Free Broadband Single and Multi Carrier DS CDMA
... L IE -L IANG Y ANG [M] received his M.Eng. and Ph.D. degrees in communications and electronics from Northern Jiaotong University, Beijing, China, in 1991 and 1997, respectively, and his B.Eng. degree in communications ...
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ADAPTIVE CODE TO USER ALLOCATION FOR INTERFERENCE MANAGEMENT ON THE DOWNLINK DS-CDMA SYSTEMS
... in CDMA systems for two reasons, the 1st reason is inter-symbol interference cancellation and the second reason is to utilize the multi-path diversity ...different multi-path components and ...
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Differentially Coherent Code Acquisition in the MIMO Aided Multi Carrier DS CDMA Downlink
... wireless systems constitutes a powerful technique of reducing the detrimental effects of fading by achieving a substantial diversity ...time-variant multi-path fading environments ...wireless systems ...
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Performance Analysis of Multi User Detectors for Synchronous DS CDMA Systems
... spreading code properties to support multiple users within the same spread bandwidth is also called spread-spectrum multiple access (SSMA), which is a special case of code-division multiple access ...
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An Efficient Code Timing Estimator for DS CDMA Systems over Resolvable Multipath Channels
... the DS-CDMA system ...the DS-CDMA sys- ...of multi- paths (referred to as resolvable paths in the sequel) are larger than the chip duration of the spreading ...
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Differentially Coherent Code Acquisition in the Multiple Transmit/Receive Antenna Assisted Multi Carrier DS CDMA Downlink
... OF CODE ACQUISITION In the case of code acquisition contrived for both MC-DS-CDMA and SC-DS-CDMA systems, the main design goal is to acquire perfect timing of the first ...
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A resource allocation approach to control interference in Multi Carrier DS CDMA systems
... MC- CDMA which is a referred to as CDMA-OFDM and second is ...the code domain. Moreover, to reduce ISI multi-carrier modulation is used by both schemes to condense the symbol rate and amount ...
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Differential space time modulation schemes for smart antenna aided generalized multicarrier DS CDMA systems
... generalized Multi-Carrier Direct Sequence Code Division Mul- tiple Access (MC DS-CDMA) system of [10] to propose a novel Differential Space-Time Spreading (DSTS) scheme as well as a ...
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Computationally Efficient Blind Code Synchronization for Asynchronous DS CDMA Systems with Adaptive Antenna Arrays
... cellular systems to mitigate MAI, time dispersion, and multipath fad- ing that occur in mobile communications has received con- siderable attention in the recent ...chronous DS-CDMA signals can be ...
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Differential Space Time Block Code Modulation for DS CDMA Systems
... of DS-CDMA systems in fast time-dispersive fading ...block code modulation for DS-CDMA (DSTBC-CDMA) ...of DS-CDMA systems with multi- ple ...
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ADAPTIVE DS-CDMA RECEIVER WITH CODE TRACING IN A DISTINCT PERIOD OF UNSPECIFIED ENVIRONMENTS
... In today’s world cell phone have become the single greatest tool in day today life. It has become a necessity that business associates should be able to communicate on the go. That’s why it has become so important to ...
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Multipass Channel Estimation and Joint Multiuser Detection and Equalization for MIMO Long Code DS/CDMA Systems
... antenna systems are capable of achieving much better per- formance than single-antenna ...multiple-antenna systems under the as- sumption that perfect channel knowledge is available at the ...
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A Unified Exact BER Performance Analysis of Asynchronous DS CDMA Systems Using BPSK Modulation over Fading Channels
... Fig. 5. BER versus the number of users K in an asynchronous DS-CDMA system using random spreading sequences and BPSK modulation commu- nicating over Nakgami- m channels. The length of the random spreading ...
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MEAN ACQUISTION TIME PERFORMANCE ANALYSIS FOR DC AND NC CODE ACQUISTION FOR MIMO ASSISTED DS-CDMA WIRELESS SYSTEMS.
... In explicit MAT formulas were provided for as single-antenna-aided serial search based code acquisition system. There is no distinction between a single-antenna-aided scheme and a multiple-antenna assisted one in ...
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Multiple Access Technologies for Beyond 3G Wireless Cellular Systems
... pulse code modulation (PCM), has become an effective way of sharing the available system resources not only in wireless communications but in wired communications since ...wireless systems for many ...
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Joint Impact of Frequency Synchronization Errors and Intermodulation Distortion on the Performance of Multicarrier DS-CDMA Systems
... The paper is structured as follows. In Section 2, we introduce an MC-DS-CDMA system model where lin- ear signal processing operations (either in the time do- main or in the frequency domain) are simply ...
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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 this ...
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Two dimension MDW OCDMA code cross-correlation for reduction of phase induced intensity noise
... MDW code properties improved the ability to mitigation MAI and maximally suppression of PIIN at the low optimum effective transmitted ...MDW code property restrains the system ...
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