Results 181 to 190 of about 31,714 (226)

Hybrid ISMA/CDMA and CDMA/ISMA protocols for IWCC

Proceedings of ICUPC '95 - 4th IEEE International Conference on Universal Personal Communications, 2002
This paper presents a novel multiple access scheme, which is a combination of inhibit sense multiple access (ISMA) and code division multiple access (CDMA), for the indoor wireless computer communications (IWCC). This new multiple access scheme is called hybrid ISMA/CDMA protocol.
F. Harmsze, R. Prasad
openaire   +1 more source

Performance of VSG-CDMA and MC-CDMA in multirate systems

IEEE VTS 53rd Vehicular Technology Conference, Spring 2001. Proceedings (Cat. No.01CH37202), 2002
The performance of two multirate schemes in DS/CDMA systems, variable spreading gain (VSG-CDMA) and multicode (MC-CDMA) are compared. We first present the signal model for a multirate DS/CDMA system. Then, the performance in terms of asymptotic multiuser efficiency (AME), near-far resistance (NFR), and BER are evaluated.
null Zihua Guo, K.B. Letaief
openaire   +1 more source

Frequency coordination between CDMA and non-CDMA systems

Proceedings of 1995 IEEE MTT-S International Topical Symposium on Technologies for Wireless Applications (Conjunction with INTER COMM'95), 2002
Mutual interference between non-CDMA (FM and TDMA) subscriber stations (SS) and CDMA base stations (BS), as well as interference between CDMA SS and non-CDMA BS are investigated. The noise figure is used as a measure of degradation of the receiver performance.
S. Soliman, C. Wheatley
openaire   +1 more source

Comparison of CS-CDMA and MC-CDMA : BER and PAPR

MILCOM 2008 - 2008 IEEE Military Communications Conference, 2008
In this paper, a cyclic prefix code division multiple access (CP-CDMA) system with the use of comb spectrum (CS) code, so called CS-CDMA, is described and a comparison between the CS-CDMA and the Multi-carrier code division multiple access (MC-CDMA) is implemented in terms of the bit error rate (BER) performance and peak to average power ratio (PAPR ...
null Hongbing Cheng, null Yu-Dong Yao, null Bingli Jiao   +2 more
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CDMA with Partitioned Spreading

IEEE Communications Letters, 2007
An enhancement to code-division multiple access (CDMA) is proposed whereby the signature sequences are partitioned into sections, which are interleaved before transmission. A multistage receiver successively forms soft-bit estimates based on the received sections, which are used to reduce the interference in subsequent stages via signal cancellation ...
openaire   +1 more source

OCDD/CDMA: a new DS/CDMA with orthonormal code diversity detection

IEEE Transactions on Communications, 2001
Summary: The paper presents a new spread spectrum communication system called orthonormal code diversity detection (OCDD)/CDMA system based on the novel concept of orthonormal-basis diversity, which is a generalization of the existing spread spectrum diversity concepts such as path diversity and frequency diversity.
Byoung-Hoon Kim, Byeong Gi Lee
openaire   +1 more source

Introduction to CDMA

Annales Des Télécommunications, 1993
The purpose of this paper is to introduce the basic concepts of code division multiple access (cdma) to those who are not familiar with the subject area. It briefly covers the two most important forms of spread spectrum modulation, frequency hopping (fh) and direct sequence (ds), before concentrating on cdma based on ds.
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Peak to Average Power Ratio Properties of MC-CDMA and SM-CDMA

2006 IEEE 63rd Vehicular Technology Conference, 2006
This paper1compares Peak to Average Power Ratio (PAPR) of Multi Carrier Code Division Multiple Access (MC-CDMA) and Serial Modulation-CDMA (SM-CDMA) with each other and with corresponding non-spread spectrum techniques which are Orthogonal Frequency Division Multiplexing (OFDM) and serial modulation (SM).
Maryam Sabbaghian, David D. Falconer
openaire   +1 more source

A repetitively coded multicarrier CDMA (RCMC-CDMA) transceiver for multiuser communications

2004 IEEE Wireless Communications and Networking Conference (IEEE Cat. No.04TH8733), 2004
This work proposes an approximately MAI-free OFDM transceiver, called the repetitively coded multicarrier CDMA (RCMC-CDMA), which uses the CDMA technique to separate different users so that every user can utilize the whole bandwidth and time slot simultaneously.
Shang-Ho Tsai, Yuan-Pei Lin, C.-C. Jay Kuo   +2 more
openaire   +1 more source

Spreading codes for direct sequence CDMA and wideband CDMA cellular networks

IEEE Communications Magazine, 1998
This article presents an overview of the spreading techniques for use in direct sequence CDMA cellular networks. We review the theoretical background for sequences used in CDMA and wideband CDMA, and discuss the main characteristics of the maximal length, Gold (1967, 1968), and Kasami sequences, as well as variable- and fixed-length orthogonal codes ...
Esmael Dinan, Bijan Jabbari
exaly   +2 more sources