Minimum error rate lattice space time codes for wireless communication
View Patent ↗A lattice space time coding arrangement for transmission systems is disclosed which enables construction of lattice space time codes with improved error rate performance for arbitrary receiver structures.
1. A method of generating lattice space-time codes for a transmission system comprising the steps of-
(i) selecting an initial lattice generator for the lattice space-time code;
(ii) simulating a series of observations based on a model of known communication channel characteristics and decoding the simulated series of observations using a selected receiver structure so as to compute an error rate for the lattice generator;
(iii) estimating a gradient for the error ate rate as a function of the lattice generator;
(iv) updating the lattice generator for the lattice space-time code using the estimated gradient;
(v) repeating steps (ii) through (iv) until an optimized lattice generator is obtained for the lattice space-time code and;
(vi) communicating over a plurality of antennas using the optimized lattice generator.
2. The method of claim 1 wherein the lattice generator is for a spherical lattice.
3. The method of claim 1 wherein the transmission system is a multiple-input multiple-output transmission system.
4. The method of claim 1 wherein the transmission system is a cooperative relay system.
5. The method of claim 1 wherein the selected receiver structure is selected from a group consisting of a maximum likelihood receiver, a naive receiver, a MMSE-GDFE lattice receiver, a MMSE-GDFE lattice-reduction-aided linear receiver, a linear receiver, and a nulling and cancellation receiver.
6. A transmission system which utilizes lattice space time codes generated by the method of claim 1 .
7. A transmitter which encodes transmissions using lattice space time codes generated by the method of claim 1 .
8. A receiver which decodes transmissions using lattice space time codes generated by the method of claim 1 .