Zobrazeno 1 - 10
of 20
pro vyhledávání: '"G. Wetzker"'
Publikováno v:
IEEE Journal of Solid-State Circuits. 39:2152-2160
This paper presents the design of a 2-2 cascaded continuous-time sigma-delta modulator. The cascaded modulator comprises two stages with second-order continuous-time resonator loopfilters, 4-bit quantizers, and feedback digital-to-analog converters.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::71ef7a782b92ba51b7af31c441ea19ee
https://doi.org/10.1109/jssc.2004.836245
https://doi.org/10.1109/jssc.2004.836245
Publikováno v:
2004 IEE Radio Frequency Integrated Circuits (RFIC) Systems. Digest of Papers.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::142b470396e517c35991e6a6af67a549
https://doi.org/10.1109/rfic.2004.1320617
https://doi.org/10.1109/rfic.2004.1320617
Autor:
Friedrich K. Jondral, G. Wetzker
Publikováno v:
Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications.
Code synchronization in direct-sequence spread-spectrum (DSSS) receivers can be divided into the acquisition and the tracking phases. Here we assume that the acquisition is performed with a periodic pseudo-random signal of period N. Acquisition of ps
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7bb03f7c78b770d1ea8d26c25106c877
https://doi.org/10.1109/isssta.1996.563763
https://doi.org/10.1109/isssta.1996.563763
Autor:
G. Wetzker, Friedrich K. Jondral
Publikováno v:
PIMRC
Today code division multiple access based on direct sequence spread spectrum (DS-CDMA) is one of the most promising multiple access techniques for land mobile communication systems. Systems like IS-95, Globalstar or UMTS will use DS-CDMA. To allow fa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::836dfb2d4e42955f31879772244582e6
https://doi.org/10.1109/pimrc.1998.731372
https://doi.org/10.1109/pimrc.1998.731372
Publikováno v:
ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384).
The performance of orthogonal frequency division multiplexing (OFDM) modulation schemes using differential (DPSK-OFDM), coherent (PSK-OFDM) data modulation and multi-carrier code division multiple access (MC-CDMA) are compared for time-variant and ti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7bae037a3d47790ef48fcd68bef9f686
https://doi.org/10.1109/icupc.1998.733647
https://doi.org/10.1109/icupc.1998.733647
Publikováno v:
1988 IEEE 5th International Symposium on Spread Spectrum Techniques and Applications - Proceedings. Spread Technology to Africa (Cat. No.98TH8333).
During the initial synchronisation in a direct sequence spread spectrum system the time and frequency uncertainty contained in the received signal have to be estimated. In this paper, maximum likelihood (ML) acquisition is investigated in the presenc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ec9050928f14e414e4fd666c2cd64f0d
https://doi.org/10.1109/isssta.1998.723822
https://doi.org/10.1109/isssta.1998.723822
Publikováno v:
1988 IEEE 5th International Symposium on Spread Spectrum Techniques and Applications - Proceedings. Spread Technology to Africa (Cat. No.98TH8333).
To evaluate the performance of modern modulation techniques suited for time-variant multipath propagation, it is necessary to simulate such channels by computer models. A time-variant multipath channel distorts a transmission link by frequency and ti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::56c6d8e058589f5040df55be2e4010c2
https://doi.org/10.1109/isssta.1998.723838
https://doi.org/10.1109/isssta.1998.723838
Autor:
G. Wetzker, Friedrich K. Jondral
Publikováno v:
GLOBECOM 97. IEEE Global Telecommunications Conference. Conference Record.
For an in-depth investigation of modern modulation techniques suited for wideband mobile communications, it is necessary to simulate randomly time-variant multipath channels. A time-variant multipath channel distorts a transmission link by frequency
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e6db4e86a34e3cc62075eda89916d720
https://doi.org/10.1109/glocom.1997.644396
https://doi.org/10.1109/glocom.1997.644396
Autor:
G. Wetzker
Publikováno v:
Electronics Letters. 41:656
A definition of spatial multiplexing gain is provided. The advantages of this definition are twofold. The spatial multiplexing gain of a multiple-input multiple-output channel can be calculated without approximations for a given channel and the spati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0b5c687506abcf4c1b361740044c80a3
https://doi.org/10.1049/el:20050786
https://doi.org/10.1049/el:20050786
Autor:
G. Wetzker, Friedrich K. Jondral
Publikováno v:
Electronics Letters. 35:611
The influence of ideal time-limited pulse shapes and ideal band-limited pulse shapes on the ambiguity function of periodic pulse shaped sequences, which are used in direct sequence spread-spectrum systems and pulse compression applications, is invest
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::89e35004a50918871cebe430d5264f9f
https://doi.org/10.1049/el:19990450
https://doi.org/10.1049/el:19990450