Johnson TR

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We demonstrate that if A 1 ; :::;Am are symmetric positive semideenite nn matrices with positive deenite sum and A is an arbitrary symmetric n n matrix, then the relative accuracy, in terms of the optimal value, of the semideenite relaxation (P) is not worse than 1 ? 1 2 ln(2m 2). It is shown that this bound is sharp in order, as far as the dependence on m(More)
Due to demographic change, more elderly people have the need to preserve and support mobility by car despite age-related functional limitations. Since accidents by the elderly are primarily caused by age related limitations, and not by careless or irresponsible behavior, it may be beneficial to detect driving impairing conditions. The presented review gives(More)
| A multiuser communication system, which combines some advantages of Code Division Multiple Access (CDMA) and Time Division Multiple Access (TDMA), is presented. For the uplink of a cellular mobile communication environment we analyse the properties of this scheme, taking into consideration multipath propagation on mobile radio channels. Applying error(More)
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