Method for DC offset removal in OFDM systems

摘要

Systems and methods for removing a DC offset from an orthogonal frequency division multiplexed (OFDM) signal transmitted over a plurality of subcarrier frequencies. The system includes a receiver. The system further includes a high pass DC component filter configured to reduce a DC component of the orthogonal frequency division multiplexed signal, the high pass DC component filter shaping noise in the orthogonal frequency division multiplexed signal which results in a non-uniform power spectral density of the noise across the plurality of subcarrier frequencies. The system further includes a noise whitener configured to compensate for the noise shaping by the high pass DC component filter by normalizing the non-uniform power spectral density of the noise across the plurality of subcarrier frequencies.

主权项

1. A system comprising:
a receiver configured to receive a serial orthogonal frequency division multiplexed (OFDM) signal, wherein the serial OFDM signal comprises a plurality of subcarriers of different frequencies; a serial-to-parallel converter configured to convert the serial OFDM signal into parallel data signals, one data signal for each subcarrier of the plurality of subcarriers; and a noise whitener configured to normalize power of noise across the plurality of subcarriers, by adjusting each data signal by a whitening factor that is (i) specific to the respective data signal and (ii) inversely related to noise power of the respective data signal.