| 摘要 |
<p>A synthetic signal of a higher quality than that of a single reception is acquired in an OFDM diversity reception. Signals received by individual antennas (11<SUB>1</SUB>, 11<SUB>2</SUB>) are subjected to FFT treatments, and C/N ratios for individual symbols are then calculated at C/N operation units (17<SUB>1</SUB>, 17<SUB>2</SUB>) and are averaged at smoothing units (18<SUB>1</SUB>, 18<SUB>2</SUB>). A first weight calculation unit (19) inputs averaged C/N ratios (CN<SUB>1</SUB>, CN<SUB>2</SUB>) of the individual branches, and determines first weighting coefficients (s<SUB>1</SUB> and s<SUB>2</SUB>) on the basis of those ratios (CN<SUB>1</SUB>/CN<SUB>2</SUB>). Signals (X<SUB>1</SUB>, X<SUB>2</SUB>) and transmission line responses (H<SUB>1</SUB>, H<SUB>2</SUB>) are multiplied by those weighting values (s<SUB>1</SUB>, s<SUB>2</SUB>). Second weighting coefficients (W<SUB>1</SUB>, W<SUB>2</SUB>) are calculated from transmission line responses (s<SUB>1</SUB>H<SUB>1</SUB>, s<SUB>2</SUB>H<SUB>2</SUB>), and weighted signals (s<SUB>1</SUB>X<SUB>1</SUB>, s<SUB>2</SUB>X<SUB>2</SUB>) are multiplied by the second weighting coefficients (W<SUB>1</SUB>, W<SUB>2</SUB>), thereby to perform an MRC synthesization.</p> |
