Patent attributes
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 (4a, 4b, 4c) which change the phase of the complex symbol sequence (13) based on frequency offsets (fa, fb, fc). N-symbol adders (5a, 5b, 5c) each add N symbol values supplied from the phase rotating units (4a, 4b, 4c), while M-power adders (6a, 6b, 6c) each calculate the power of a value supplied from the N-symbol adders (5a, 5b, 5c), and add the power M times. A frequency offset control unit (7) controls frequency offsets applied to the phase rotating units (4a, 4b, 4c) based on three power sums supplied from the M-power adders (6a, 6b, 6c), and delivers a power offset estimate (8).
