Asynchronous DS-CDMA
Computationally Efficient Blind Code Synchronization for Asynchronous DS CDMA Systems with Adaptive Antenna Arrays
... In the present paper, an adaptive near-far robust syn- chronization array detector for space-time asynchronous DS-CDMA signals is developed. The primary requirement needed for the proposed timing ...
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Exact BER Performance of Asynchronous DS CDMA Systems using Quadriphase Spreading and QPSK Modulation over Rayleigh Channels
... In this paper we derived an exact closed-form expression for calculating the average BER of an asynchronous DS- CDMA system using QPSK modulation and random quad- riphase spreading sequences for ...
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Exact BER Calculation of Asynchronous DS CDMA Systems Communicating over Hoyt Channels
... Fig. 2. 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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Accurate BER Analysis of QPSK Modulated Asynchronous DS CDMA Systems Communicating over Rayleigh Channels
... In this paper we investigated the average BER performance of an asynchronous DS-CDMA system using I/Q modulation and random spreading sequences, when communicating over Rayleigh channels. A new ...
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Bit Error Performance for Asynchronous Ds Cdma Systems Over Multipath Rayleigh Fading Channels (RESEARCH NOTE)
... in asynchronous DS/CDMA, using a random sequence in an AWGN ...for asynchronous DS/CDMA in multipath Rayleigh fading channel, using the improved Gaussian ...
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Ternary Zero Correlation Zone Sequence Sets for Asynchronous DS CDMA
... the asynchronous DS-CDMA system em- ploying Hayashi’s TZCZ (40, 8, 3), Hayashi’s TZCZ (20, 8, 1) and the proposed ternary ZCZ sequence sets with parameter TZCZ (32, 8, ...
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Accurate BER Analysis of Asynchronous DS CDMA Systems in Ricean Channels
... [18]–[20], [22]–[26], and there are numerous studies also for transmission over both Rayleigh [2], [12] and Nakagami- m [3], [4], [11], [17], [21] channels. Geraniotis and Purs- ley [18] were the first authors, who ...
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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 ...
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On the Performance of Band Limited Asynchronous DS CDMA over Nakagami m Channels
... Abstract— In this paper we investigated the BER performance of DS-CDMA using various chip-waveforms, which include three time-limited chip-waveforms and two band-limited chip- waveforms. Closed-form ...
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Adaptive Iterative Soft Input Soft Output Parallel Decision Feedback Detectors for Asynchronous Coded DS CDMA Systems
... We consider an asynchronous DS-CDMA system over the additive white Gaussian noise (AWGN) channel. It is assumed that the receiver has no knowledge of the short spreading codes used by the users and ...
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Space-Time Joint Interference Cancellation Using Fuzzy-Inference-Based Adaptive Filtering Techniques in Frequency-Selective Multipath Channels
... an asynchronous DS-CDMA signal model is ...MMSE CDMA receiver is developed in Section ...for DS-CDMA inter- ference ...MMSE CDMA receiver are derived in ...alent ...
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Multiuser Detection for Synchronous DS-CDMA in AWGN Channel
... improving DS-CDMA detection through the use of multiuser detectors as proposed in ...multiuser DS-CDMA systems, detection involves exploitation of the base station’s knowledge of signature ...
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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
... in which the receive signal is multiplied by time-shifted versions of a locally generated code sequence. The intention is to separate signals such that each finger only sees signals coming in over a single (resolvable) ...
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Ber Calculation Of Ds-Cdma Over Communication Channels
... of CDMA. Direct- sequence CDMA (DS-CDMA) spreads the signal directly by multiplying the data waveform with a user-unique high bandwidth pseudo-noise binary ...
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Subband Adaptive Array for DS CDMA Mobile Radio
... practical DS-CDMA systems often su ff er multipaths with delays of about several chips, and in such case, the implicit 2D RAKE can achieve relatively equivalent performance of the standard 2D RAKE ...
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Analysis of Carrier Frequency Selective Offset Estimation - Using Zero-IF and ZCZ In MC-DS-CDMA
... the signal is orthogonal to one another there will absence of mutual interference. The major advantage of OFDM signal is to avoid the effect of reflection and ISI over noisy channel. The carrier spacing is equal to the ...
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On the Uplink Performance of Asynchronous LAS CDMA
... We observed in Section 2.1 that the main problems associ- ated with applying LA codes in practical CDMA systems are related to their low duty ratio and to the resultant limited number of available codes. A specific ...
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VHDL Implementation of MAC based DSSS CDMA Protocol for Solving near Far Effect IN Ad hoc Network
... which are dynamically be started anywhere and anytime while not using any pre-existing network infrastructure [1] .One among the fundamental challenges in Ad hoc networks analysis is the way to increase the overall ...
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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 Comparison of FH/MC DS CDMA with Single and Multi Carrier DS CDMA
... The multiple-access scheme is constituted by frequency-hopping FH based multicarrier DS-CDMA FWMC DS-CDMA, where the entire bandwidth of future systems can be divided into a number of su[r] ...
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