synchronous DS-CDMA channel
Multiuser Detection for Synchronous DS-CDMA in AWGN Channel
... the channel. The conventional CDMA is an interference limited system when MAI is increasing with the number of active users, and when signals are received with different power levels due to near-far ...and ...
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Performance of Reverse Link Synchronous DS CDMA System on a Frequency Selective Multipath Fading Channel with Imperfect Power Control
... Suppose we have K transmitters able to adjust their timing clock of the main paths to be aligned at the CS by the timing control algorithm [6]. Therefore, in our analysis, the eval- uation is carried out for the case in ...
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Analysis of a Combined Antenna Arrays and Reverse Link Synchronous DS CDMA System over Multipath Rician Fading Channels
... However, previous studies [8, 13] have assumed the pres- ence of Rayleigh fading and have neglected the performance benefit of having a specular component in Rician fading channel, which is often characterized in ...
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A Space Time Spreading Assisted Multicarrier DS CDMA System using OVSF Codes Employing Adaptive Mode Switching Thresholds and Adaptive Modulation
... nas, but only a single receiver antenna is invoked. Furthermore, in this contribution a synchronous MC DS-CDMA scheme de- signed for the downlink channel is investigated, where K user signals ...
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Performance Analysis of A Ds Cdma System by using Rayleigh and Nakagami M Fading Channel
... BPSK (additionally once in a while called PRK, stage different keying, or 2PSK) is the most straightforward type of stage move keying (PSK). .This modulation is the most strong of all the PSKs since it takes the largest ...
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Uplink channel power control improvement in DS CDMA system using channel predictions
... are synchronous and can be made orthogonal; but uplink codes arrive at the base station asynchronously, resulting in cross correlation and hence high in-cell interference potential unless power is adequately ...
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Spectrally Efficient Four Dimensional M-ary QAM for Synchronous DS-CDMA
... 2 DS-CDMA synchronous downlink channel is explored analytically using CT signals and p erformance measures obtained for comparison with other systems ...
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Genetic algorithm assisted Joint multiuser symbol detection and fading channel estimation for synchronous CDMA systems
... and channel estimation in DS/CDMA over flat-fading channels based on a genetic algorithm (GA) in- ...users’ channel coefficients as well as the transmitted bit sequences on the basis of the ...
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Joint Closed-Loop Power Control and Base Station Assignment for DS-CDMA Receiver in Multipath Fading Channel with Adaptive Beamforming Method
... a DS-CDMA cellular system. The channel is modeled as a frequency selective channel with Rayleigh distribution and lognormal distributed ...a synchronous DS-CDMA scheme and ...
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Spreading Sequence Design for Multiple Cell Synchronous DS CDMA Systems under Total Weighted Squared Correlation Criterion
... An algorithm for designing spreading sequences for an overloaded multicellular synchronous DS-CDMA system on uplink is introduced. The criterion used to measure the optimality of the design is the ...
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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 spectrum. Using spreading code properties to support multiple users within the same spread bandwidth is also called spread-spectrum ...
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A Combined Antenna Arrays and Reverse Link Synchronous DS CDMA System over Frequency Selective Fading Channels with Power Control Error
... In this paper, an improved AA has been introduced, in which RLSTT is incorporated to effectively make better an es- timation of covariance matrices at a Beamformer-RAKE re- ceiver. While RLSTT is e ff ective in the first ...
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Blind Per Survivor Processing Based Multiuser Detection for Channel Coded Multi Carrier DS CDMA Systems
... Subsequently, we analyse the performance of the synchronous MC DS-CDMA system considered, when employing three different channel coding schemes, namely Low Density Parity Check LDPC code[r] ...
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On the Performance of Band Limited Asynchronous DS CDMA over Nakagami m Channels
... based DS-CDMA scheme is the worst amongst the three chip-waveforms ...based DS-CDMA system achieves a similar performance to that of the scheme using a time-domain raised cosine ...based ...
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A Unified Exact BER Performance Analysis of Asynchronous DS CDMA Systems Using BPSK Modulation over Fading Channels
... Fig. 3. BER versus the number of users K in an asynchronous DS- CDMA system using random spreading sequences and BPSK modulation communicating over Hoyt channels. The length of the random spreading ...
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Performance Evaluation of a DS CDMA System in a Rayleigh Fading Environment
... of DS-CDMA in a Rayleigh fading ...a DS-CDMA system to evaluate the signal-to-noise ratio (SNR), signal-to-interference ratio (SIR) and bit error rate (BER) for different modulation schemes ...
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A review on synchronous CDMA systems: optimum overloaded codes, channel capacity, and power control
... ideal channel and propose an ML decoding scheme for a special class of these ...the channel capacity of CDMA systems with and without channel ...The channel capacity lower and upper ...
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Multipass Channel Estimation and Joint Multiuser Detection and Equalization for MIMO Long Code DS/CDMA Systems
... simulations. In Figures 4 and 5 we thus report the error probability versus the signal-to-noise ratio for the linear MMSE receiver (Section 4.1) and for the iterative MMSE re- ceiver (Section 4.2). The considered system ...
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Performance and Analysis of DS CDMA Rake Receiver
... of CDMA systems is the capability of using signals that arrive in the receivers with different time ...receivers, CDMA uses the multipath signals and combines them to make an even stronger signal at the ...
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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
... of CDMA systems is the capability of using signals that arrive in the receivers with different time ...receivers, CDMA uses the multipath signals and combines them to make an even stronger signal at the ...
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