Results 191 to 200 of about 23,563 (255)

A coding-theoretical view on code division multiple access: two new constructions of CDMA codes

Proceedings of IEEE Vehicular Technology Conference (VTC), 2002
Coding 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
A. Lundqvist, P.-O. Anderson
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Tracking acoustic transmitters by code division multiple access (CDMA)-based telemetry

Hydrobiologia, 2002
This paper describes a new acoustic telemetry system based on the principles of code division multiple access (CDMA) whereby signal coding enables the simultaneous sub-meter monitoring of potentially hundreds of animals at high sampling rate (e.g. 5 s) and on a single frequency channel.
G. Niezgoda, M. Benfield, M. Sisak, P. Anson   +3 more
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Neural matched filter detection in synchronous code-division multiple-access (CDMA) systems

Thirteenth National Radio Science Conference. NRSC '96, 2002
In communication networks employing spread-spectrum (SS) code-division multiple-access (CDMA), the performance of single user matched filter receivers are highly degraded when the relative powers of the interfering signals are large (the near-far problem).
S.E. El-Khamy, H.-E.-D.M. Abdou
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Code Division Multiple Access (CDMA)

2018
This 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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Quasi‐synchronous code division multiple access (CDMA) with binary shift‐register sequences

Electronics and Communications in Japan (Part III: Fundamental Electronic Science), 1996
AbstractThis paper discusses the quasi‐synchronous code‐division multiple access system (QS‐CDMA), where the time error in the synchronized access is allowed for a certain range, based on the spread‐spectrum communication technique. the Gold sequence and the M sequence, which are the binary shift‐register sequences, are used to derive the set of quasi ...
Seiji Kuno, Takaya Yamazato, Masaaki Katayama, Akira Ogawa   +3 more
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Applications of optical code division multiple access (CDMA) to wireless communication

Proceedings of SPIE, 1995
The theoretical foundations for code division multiple access (CDMA) are similar for microwave and optical implementations, and the advantages of this form of multiple access communications are similar, also. The advantages include the ability to support bursty, asynchronous, concurrent communications and to tolerate multipath interference.
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Analyses and experiments of optical code division multiple access (CDMA) with code length near unity

LEOS '95. IEEE Lasers and Electro-Optics Society 1995 Annual Meeting. 8th Annual Meeting. Conference Proceedings, 2002
Optical code division multiple access (CDMA) has many attractive system features. In this paper we describe the analytical approach to encoding/decoding data with chips approaching the bit size (representing 100% bandwidth efficiency), and we describe the experimental performance in terms of bit error rate (BER) measurements.
A.J. Mendez, J.-M. Morookian, R.M. Gagliardi   +2 more
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A multichannel short range bidirectional infrared link with code division multiple access (CDMA)

IEEE Transactions on Consumer Electronics, 1998
In this paper, we present an infrared transmission system meant for indoor applications. It is based on CDMA technology and therefore it is highly resistant to environmental interference such as fluorescent light. A very simple synchronization scheme is employed based on a slight detuning of quartz oscillators in the terminals and central station.
K. Holejko, J. Siuzdak, R. Nowak, A. Marzecki   +3 more
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Linear Multiuser Detection in Code Division Multiple Access CDMA - Systems for Wireless Communication

2005 Student Conference on Engineering Sciences and Technology, 2005
Multiuser detection is central to the fulfillment of the capabilities of code-division multiple access (CDMA), which is becoming the ubiquitous air-interface in future generation communication systems. In DS-CDMA communications, all user signals overlap in time and frequency and cause mutual interference.
Muhammad Zahid Khan, null Haroon-Ur-Rashid   +1 more
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Average Likelihood Methods for Code Division Multiple Access (CDMA)

2014
Abstract : This final report summarizes the most significant findings of the work done under the in-house effort titled Optimal Methods for Modulation Classification on average likelihood methods. The development began with the exact calculation of the likelihood function using symbolic algebra software.
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