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1 Code-Spread CDMA using Maximum Free Distance Low-Rate Convolutional Codes P al Frenger, P al Orten, and Tony Ottosson Abstract| In CDMA systems maximum theoretical performance can be obtained by spreading with low-rate error control codes. Previously, orthogonal and super-orthogonal codes have been proposed for this purpose. We present in this paper a(More)
This paper describes a technique for realizing a high rank channel matrix in a line-of-sight (LOS) multiple-input-multiple-output (MIMO) transmission scenario. This is beneficial for systems which can not make use of the originally derived MIMO gain given by independent and identically distributed (i.i.d.) flat Rayleigh fading channels. Typical applications(More)
| New nested convolutional codes and rate-compatible punctured convolutional (RCPC) codes with high constraint lengths and wide range of code rates are presented. It is shown that these codes are almost as good as the existing optimum convolutional codes for the same rates. The eeects of varying the design parameters of the RCPC codes, i.e. the mother code(More)
| New convolutional codes with rates 1=2, 1=3 and 1=4 are presented for constraint lengths ranging from 3 to 13. These new codes are maximum free distance codes. Furthermore the codes have minimum possible information error weight, thus resulting in a low bit error rate for binary communication. Improved coding gains of as much as 0.6 dB compared to(More)
In this paper we consider pure line-of-sight multiple-input multiple-output channels employing uniform linear antenna arrays. We investigate the influence of exact spherical wave propagation modeling versus approximate plane wave propagation modeling on the properties of the MIMO channel matrix. When transmission distance increases, the properties of the(More)
1Department of Electronics and Telecommunications, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway 2Honeywell Laboratories, Minneapolis, MN 55418, USA 3Department of Electrical and Computer Engineering, Texas A&MUniversity at Qatar, P.O. Box 23874, Doha, Qatar 4 Institut Eurécom, 06904 Sophia-Antipolis, France 5Department of(More)
Huge popularity of mobile devices and Internet open new application field of wireless positioning and navigation systems, and this integration also brings new research issues. Currently the positioning and navigation systems are mostly based on satellite positioning systems, such as GPS. One serious drawback of these satellite based positioning and(More)