Patent ID: 8619646

Claim:
A method of transmitting a pre-coded Enhanced General Packet Radio Service (EPGRS)/EPGRS phase 2 (EGPRS2) symbol sequence, the symbol sequence comprising data sequence symbols and training sequence symbols, the method comprising: selecting a modulation method and a set of rotation angles corresponding to the selected modulation method, wherein sets of rotation angles corresponding to different modulation methods have no rotation angle in common, and wherein all the angles in said set of rotation angles are integer multiples of 2Ï€ divided by the total number of precoded data and training symbols; generating a set of training sequences from one original training sequence by rotating the original training sequence by the angles in said set of rotation angles; selecting a rotation angle from said set of rotation angles; and pre-coding and transmitting the EGPRS/EGPRS2 symbol sequence using the selected modulation method and rotating the training symbol sequence using the selected rotation angle.