Results 121 to 130 of about 1,077 (174)
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Independent Code Division Multiple Access in DS-CDMA
Wireless Personal Communications, 2021An independent component analysis (ICA) based CDMA receiver is proposed, which in addition to the independence of users also exploits the independence of pseudo-codes in user signal separation. The proposed scheme is termed as independent code division multiple access in contrast to orthogonal code division multiple access being used in conventional ...
Irfan Anjum +2 more
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Chaotic Digital Code-Division Multiple Access (CDMA) Communication Systems
International Journal of Bifurcation and Chaos, 1997In this paper, the structure, principle and framework of chaotic digital code-division multiple access ((CD)2 MA) communication systems are presented. Unlike the existing CDMA systems, (CD)2MA systems use continuous pseudo-random time series to spread the spectrum of message signal and the spread signal is then directly sent through a channel to the ...
Yang, Tao, Chua, Leon O.
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Study of asynchronous telecommunication system, based on code division multiple access (CDMA)
2024 XXXIII International Scientific Conference Electronics (ET)Ivo Dochev
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A coding-theoretical view on code division multiple access: two new constructions of CDMA codes
Proceedings of IEEE Vehicular Technology Conference (VTC), 2002Coding techniques for the multiple-access problem are investigated. Two constructions of code sequences are considered, one for the OR channel and one for the Gaussian channel. A new construction of codes for the OR channel, which belongs to the family of cyclically permutable (CP) codes also known as optical orthogonal codes, removes the constraint of
Anders Lundqvist, Per-Olof Anderson
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On multi-carrier code division multiple access (MC-CDMA) modem design
Proceedings of IEEE Vehicular Technology Conference (VTC), 2002Standard spread-spectrum techniques encounter a severe performance loss under channels with large Doppler spread. It is shown that the novel spread-spectrum technique, called multi-carrier (MC) CDMA, is dual to direct-sequence CDMA. This enables to derive that MC-CDMA is a signalling technique which allows optimum detection under severe Doppler spread.
Gerhard P. Fettweis +2 more
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Performance Analysis of a Slotted Code Division Multiple Access(CDMA) Network
MILCOM 1984 - IEEE Military Communications Conference, 1984A performance model of a multihop Code Division Multiple Access(CDMA) Spread Spectrum Network is presented. Time is divided into slots and the network nodes are synchronized such that fixed length messages will only be sent at the beginning of slots. The message generation processes at the nodes are assumed to be independent Bernoulli processes. A node
Szu-Lin Su, Victor O.K. Li
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Generalized Temporal Code Division Multiple Access (CDMA) For Optical Communications
SPIE Proceedings, 1990The CSI has developed analytical techniques for constructing pseudo orthogonal words suitable for temporal CDMA. The performance of these sets of words have been studied with respect to bit-error rate and with respect to other coding methods. The CSI methodology and algorithms permit generalized solutions for any combination of users (words), weights ...
A. J. Mendez +3 more
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Code Division Multiple Access (CDMA)
2018This chapter presents a brief overview of spread spectrum technique and shows how it relates to CDMA technology. Orthogonal codes and their properties are presented and show how orthogonal codes are generated and used to design CDMA radio. It is shown that CDMA capacity directly relates to code length.
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Code division multiple access (CDMA) enhancement of wavelength division multiplexing (WDM) systems
Proceedings IEEE International Conference on Communications ICC '95, 2002Wavelength division multiplexing (WDM) is a mainstream technology for optical communications ranging from long haul applications to interconnections between and within high speed digital systems. WDM is, however, constrained (1) in density by the crosstalk associated with channel spacing and (2) by total number of channels which can be uniformly ...
A.J. Mendez, R.M. Gagliardi
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