PRE-CODING METHOD, DEVICE AND SYSTEM

Embodiments of the present invention provide a precoding method, an apparatus, and a system. The precoding method in the present invention includes: obtaining a channel matrix on each subcarrier, where the channel matrix includes channel vectors of all CPEs on the subcarrier, and the CPEs include a linear CPE supporting linear precoding and a non-linear CPE supporting non-linear precoding; obtaining a precoding matrix by means of calculation according to the channel matrix; performing, according to the channel matrix, non-linear precoding on a signal to be sent to the non-linear CPE; and performing linear precoding on to-be-sent signals according to the precoding matrix, where the to-be-sent signals include a signal to be sent to the linear CPE and the signal that is to be sent to the non-linear CPE and on which non-linear precoding has been performed. The embodiments of the present invention achieve a win-win effect of maintaining a rate of a linear CPE and improving a rate of a non-linear CPE, and can decrease a bit error rate and improve system stability.