Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Henkel, Oliver"'
Autor:
Sezgin, Aydin, Henkel, Oliver
It is well known, that the Alamouti scheme is the only space-time code from orthogonal design achieving the capacity of a multiple-input multiple-output (MIMO) wireless communication system with n_T=2 transmit antennas and n_R=1 receive antenna. In t
Externí odkaz:
http://arxiv.org/abs/0707.3175
Autor:
Henkel, Oliver
Publikováno v:
Proc. IEEE GlobeCom, San Francisco, California, Nov. 2006
A new class of space time codes with high performance is presented. The code design utilizes tailor-made permutation codes, which are known to have large minimal distances as spherical codes. A geometric connection between spherical and space time co
Externí odkaz:
http://arxiv.org/abs/0704.3120
Autor:
Henkel, Oliver
In this paper non-group permutation modulated sequences for the Gaussian channel are considered. Without the restriction to group codes rather than subsets of group codes, arbitrary rates are achievable. The code construction utilizes the known optim
Externí odkaz:
http://arxiv.org/abs/0704.3019
Autor:
Henkel, Oliver
Publikováno v:
IEEE Trans. Inform. Theory, vol. 52, no. 12 (Dec 2006), 5324-5335
In this work, the geometric relation between space time block code design for the coherent channel and its non-coherent counterpart is exploited to get an analogue of the information theoretic inequality $I(X;S)\le I((X,H);S)$ in terms of diversity.
Externí odkaz:
http://arxiv.org/abs/cs/0510047
Autor:
Henkel, Oliver
A new design method for high rate, fully diverse ('spherical') space frequency codes for MIMO-OFDM systems is proposed, which works for arbitrary numbers of antennas and subcarriers. The construction exploits a differential geometric connection betwe
Externí odkaz:
http://arxiv.org/abs/cs/0501085
Autor:
Henkel, Oliver
Publikováno v:
IEEE Transactions on Information Theory, vol 51, no 10, (2005), 3445-3456
Applying the Riemann geometric machinery of volume estimates in terms of curvature, bounds for the minimal distance of packings/codes in the Grassmann and Stiefel manifolds will be derived and analyzed. In the context of space-time block codes this l
Externí odkaz:
http://arxiv.org/abs/math/0308110
Autor:
Henkel, Oliver
Publikováno v:
J.Math.Phys. 43 (2002) 2466-2485
This second part is devoted to the investigation of global properties of Prescribed Mean Curvature (PMC) foliations in cosmological spacetimes with local $U(1) \times U(1)$ symmetry and matter described by the Vlasov equation. It turns out, that thes
Externí odkaz:
http://arxiv.org/abs/gr-qc/0110082
Autor:
Henkel, Oliver
A theorem about local in time existence of spacelike foliations with prescribed mean curvature in cosmological spacetimes will be proved. The time function of the foliation is geometrically defined and fixes the diffeomorphism invariance inherent in
Externí odkaz:
http://arxiv.org/abs/gr-qc/0108003
Autor:
Brody, Evelyn, Hammer, Doug, Henkel, Oliver, Matheny, Patsy, Morse, Alan R., McPherson, Bruce
Publikováno v:
Inquiry, 2007 Oct 01. 44(3), 238-246.
Externí odkaz:
https://www.jstor.org/stable/29773316
