Method and Apparatus for Asynchronous OFDMA/SC-FDMA

摘要

Cyclic prefix based OFDM (CP-OFDM) signals can be filtered using a digital filter whose filter length exceeds the length of a cyclic prefix in CP-OFDM symbols of the signal. In one example, the duration of the filtered CP-OFDM symbol may be expressed by the following equation: M=N+L−1, where M is the duration of the filtered CP-OFDM signal, N is a duration of the CP-OFDM signal, and L is the filter length of the digital filter. Digitally filtering the CP-OFDM signal may include convolving a filtering signal with the CP-OFDM signal. The digital filter may include a finite impulse response (FIR) filter or an infinite impulse response (IIR) filter. In some embodiments, a different digital filter may be applied to each sub-band of the CP-OFDM signal.

主权项

1. A method for communicating orthogonal frequency-division multiplexing (OFDM) signals in a wireless communication system, the method comprising:
obtaining a cyclic prefix based OFDM (CP-OFDM) signal comprising a plurality of CP-OFDM symbols having a cyclic prefix comprising a repetition of an end of the corresponding CP-OFDM symbol; applying a digital filter to the obtained CP-OFDM signal to obtain a filtered CP-OFDM signal; and transmitting the filtered CP-OFDM signal over a radio interface.