Abstract:

The downlink performance of orthogonal frequency division multiplexing (OFDM) frequency hopping system with time-frequency mapping patterns derived from Costas sequence was analyzed in a multi-cell multi-user scenario. Through the comparison of frequency hopping system and non frequency hopping system using system level simulations, the frequency hopping solution is proved to be effective against inter-cell interference. To mitigate inter-cell interference further, a new resource planning scheme based on “reuse partition” was proposed, it is suitable for frequency hopping This scheme provides interference avoidance by allocating a different prior slot for each cell. The resource in the non-prior slots also can be used due to the interference average induced by frequency hopping. It is demonstrated by simulation results that the proposed scheme will be able to mitigate inter-cell interference further when the system load is under a certain value.

Key words: orthogonal frequency division multiplexing, frequency hopping, resource planning