| 摘要 |
A complex symbol sequence ( 13 ), which is a product of an orthogonally detected complex demodulated symbol sequence ( 1 ) and a conjugate complex number of a known symbol sequence ( 2 ), is applied to phase rotating units ( 4 a, 4 b, 4 c) which change the phase of the complex symbol sequence ( 13 ) based on frequency offsets (fa, fb, fc). N-symbol adders ( 5 a, 5 b, 5 c) each add N symbol values supplied from the phase rotating units ( 4 a, 4 b, 4 c), while M-power adders ( 6 a, 6 b, 6 c) each calculate the power of a value supplied from the N-symbol adders ( 5 a, 5 b, 5 c), and add the power M times. A frequency offset control unit ( 7 ) controls frequency offsets applied to the phase rotating units ( 4 a, 4 b, 4 c) based on three power sums supplied from the M-power adders ( 6 a, 6 b, 6 c), and delivers a power offset estimate ( 8 ).
|
