Patent ID: 7649953
Filing Date: 2010-01-19
Classification: H04B,H04L

Abstract:
1. A method of achieving differential multiple-length transmit diversity from orthogonal designs using at least two transmit antennas, comprising the steps: dividing a group of transmission bits into a first sub-group of transmission bits and a second sub-group of transmission bits; mapping the first sub-group of transmission bits onto constellation points of a differential transmit diversity coding scheme from an orthogonal design for coding the first sub-group of transmission bits; determining transmission symbols through differential encoding of the constellation points and previously transmitted transmission symbols for setup of a transmission symbol vector; and scaling a length of the transmission symbol vector for coding the second sub-group of transmission bits; wherein the step of mapping the first sub-group of transmission bits comprises a step of: the step of determining transmission symbols (S wherein the step of scaling the transmission symbol vector length is achieved according to: wherein