To mitigate inter-block interference（IBI） and inter-carrier interference（ICI） in an orthogonal frequency divi-sion multiplexing（OFDM） system

pre-processing approaches at transmitters based on full channel state information（CSI） had been proposed

the performance improved and receiver simplied.However

feeding full CSI back would oc-cupy scarce bandwidth and was impractical sometimes for the systems with high real-time demand.To deal with this problem

a preprocessing optimization based on partial CSI feedback was investigated and three selected preprocessing approaches of optimization matrix were developed and tested.Computer simulation results showed that the proposed op-timization algorithm can effectively cancel IBI and ICI and significantly improve the performance in wideband OFDM systems.Compared with the pre-processing approaches at transmitters based on full CSI

under the condition of meeting the demand for quality of services（QoS）

the proposed scheme has high spectral efficiency and low feedback and com-putation complexity.