Embodiments of the present invention provide an information processing apparatus, a network node, and an information processing method. The information processing apparatus may include an inverse fast Fourier transform IFFT module, a precoding module, and a determining module. The IFFT module is configured to separately perform IFFT processing on N frequency-domain data streams to acquire N time-domain data streams, where N is a positive integer. The precoding module is configured to perform precoding processing on the N time-domain data streams to acquire a precoding processing result. The determining module is configured to determine, according to the precoding processing result, an orthogonal frequency division multiplexing OFDM symbol that needs to be sent over each antenna of M antennas, so that an information transmission apparatus sends, by using each antenna of the M antennas, the OFDM symbol that needs to be sent over each antenna, where M is a positive integer greater than N. According to the embodi
