Downlink interference coordination and mitigation for future LTE-advanced system

As the wireless access technology evovles to wider and wider bandwidth, orthogonal frequency division multiplex (OFDM) becomes the fundamental technology component to provide efficient data transmission. However, compared to code division multiplex access (CDMA), OFDM has no capability to mitigate the intercell interference though it can provide orthogonality among the intracell users. To build a cellular network and guarantee the user experience at the cell edge, some additional technology components, like interference coordination or interference mitigation, are necessary for OFDM based wireless system, where intercell interference is the main contribution to the performance degradation at the cell edge. To deal with the intercell interference, many techniques can be adopted for different perspectives. This paper overviews such technologies based on the LTE framwork, some new interference mitigation technologies are simulated for LTE-advanced, which can improve the cell edge performance of LTE-advanced effectively.