Zobrazeno 1 - 10
of 104
pro vyhledávání: '"R.E. Ziemer"'
Autor:
R.E. Ziemer, D.T. Harvatin
Publikováno v:
IEEE Journal on Selected Areas in Communications. 19:1255-1263
A multirate modulation scheme with controlled peak-to-average power (PAV) ratio and suitable for code division multiple access techniques is introduced. The scheme utilizes codes drawn from a fixed set of Walsh-Hadamard codes but other code families
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6785f3ad10bb90076c2aabe7b3fba678
https://doi.org/10.1109/49.932694
https://doi.org/10.1109/49.932694
Autor:
R.E. Ziemer, A. Boariu
Publikováno v:
IEEE Transactions on Communications. 49:1520-1524
A way to allow variable data rates in CDMA is by varying the spreading factor in accordance with the data rate requested by the user. A detection scheme suitable for multirate transmission is required in addition to one that combats multiple access i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1a68fc400a9ca1305cdb56b9cc2ef720
https://doi.org/10.1109/26.950338
https://doi.org/10.1109/26.950338
Autor:
A. Boariu, R.E. Ziemer
Publikováno v:
IEEE Journal on Selected Areas in Communications. 17:1953-1959
In synchronous code division multiple access (CDMA) systems, both multiple access interference (MAI) and intersymbol interference (ISI) arise. MAI is present due to the CDMA format while ISI is present due to channel multipath. One approach to overco
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9559f8e5623b7de522852d4ae20be7f4
https://doi.org/10.1109/49.806824
https://doi.org/10.1109/49.806824
Publikováno v:
IEEE Transactions on Communications. 45:227-238
We first derive the joint optimal maximum-likelihood (ML) estimator of the carrier phase, both Doppler shift and Doppler rate, and the spreading code delay for a short burst direct sequence/spread spectrum (DS/SS) transmission in the absence of the d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::447ad5cd693a4205d8c5682c0a9b617f
https://doi.org/10.1109/26.554371
https://doi.org/10.1109/26.554371
Autor:
A. Boariu, R.E. Ziemer
Publikováno v:
IEEE Communications Letters. 4:77-79
The decorrelating decision-feedback (DDF) multiuser detector based on Cholesky factorization has been shown to alleviate the performance degradation of the users in the detection process, especially for relatively low cross-correlation values between
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f9299ec910a8e1c7ebaa9932a758e5d0
https://doi.org/10.1109/4234.831030
https://doi.org/10.1109/4234.831030
Autor:
R.E. Ziemer, C.M. Barnhart
Publikováno v:
IEEE Transactions on Systems, Man, and Cybernetics. 21:1060-1070
A method for evaluating the topological quality of networks for distributed sensor applications is presented. The criteria for evaluation are network survivability and delay. Nodal connectivity is used to characterize survivability, and mean path len
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b31181384b173a5a9e1aeec659ef81e5
https://doi.org/10.1109/21.120058
https://doi.org/10.1109/21.120058
Autor:
R.E. Ziemer, Stefan-Cristian Rezeanu
Publikováno v:
IEEE Communications Letters. 2:33-35
We develop a fast-acquisition simplified joint maximum-likelihood (ML) estimation algorithm of the bit synchronization epoch and data bit values for a short-burst direct-sequence spread-spectrum (DSSS) transmission, in a white Gaussian noise environm
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dc9f3409169ab1c0559b1e50dae3e50e
https://doi.org/10.1109/4234.660795
https://doi.org/10.1109/4234.660795
Autor:
R.E. Ziemer, M.C. Petzold
Publikováno v:
1999 IEEE 49th Vehicular Technology Conference (Cat. No.99CH36363).
We study a direct sequence spread spectrum DPSK multicarrier system combined with the interleaved serial concatenated convolutional codes. This combination of error correction coding and modulation is both powerful and flexible. In this paper, we stu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6ee4462a674236793f9b315e10869b12
https://doi.org/10.1109/vetec.1999.778022
https://doi.org/10.1109/vetec.1999.778022
Autor:
J.L. Gross, R.E. Ziemer
Publikováno v:
IEEE Military Communications Conference, 'Bridging the Gap. Interoperability, Survivability, Security'.
The authors consider the problem of optimum shortest-path routing in a communications network consisting of multiple nodes and links located in a hostile environment. The robustness of the routing algorithm to node or link failures is of interest her
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::63213f1fb587f6d41eb6060b4b8faaa9
https://doi.org/10.1109/milcom.1989.103930
https://doi.org/10.1109/milcom.1989.103930
Autor:
Youngyearl Han, R.E. Ziemer
Publikováno v:
IEEE Military Communications Conference, 'Bridging the Gap. Interoperability, Survivability, Security'.
A modified receiver for frequency-hopped MFSK (M-ary frequency-shift keying) for mobile communications is presented. This modified receiver provides an implementation advantage by eliminating unnecessary energy detection of all the frequency channels
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::42751b2e83f5569f180be2f650e315c4
https://doi.org/10.1109/milcom.1989.103914
https://doi.org/10.1109/milcom.1989.103914