| 摘要 |
1. Process for decoding a signal being representative of a Space Time or Frequency Block coding during two signaling periods (STBC) or two parallel channels (SFBC), comprising:
- receiving an OFDM signal received from at least one antenna;
- performing an OFDM demodulation in order to generate N frequency domain representations of said received signal, each associated to one carrier;
- performing a decoding process applied on said OFDM demodulated signal, in order to group the received signal in word code Y = (y 1 , y 2 ) being representative of the received signal received during two signaling periods (STBC) or two parallel channels (SFBC),
- decoding said word code Y = (y 1 , y 2 ) in order to compute the transmitted symbols x 1 and x 2 in accordance with the following formulation: y 1 y 2 * = h 1 h 2 h Ü 2 * - h Ü 1 * �¢ x 1 x 2 + n 1 n 2 * The process further comprises the steps of
- applying a lattice reduction algorithm on said matrix H = ( b 1 , b 2 ) in order to transform said matrix in a reduced matrix Hred = ( b ' 1 , b ' 2 ) having vector being close to orthogonal;
- performing a detection process on said reduced matrix in order to improve immunity with respect to noise and interference. |
