Abstract:

An intact scheme of synchronization and channel estimation for the standard multi band orthogonal frequency division multiplexing (MB OFDM) based ultra wide band (UWB) system is presented. The midpoint of the correlation peak is considered as the coarse timing position to reduce the error range. Fine timing is achieved by searching the minimum energy ratio of adjacent data windows according to the zero padding characteristic. This scheme is neither sensitive to frequency offset nor to multipath. Revision of timing position is performed twice to prevent the loss of information data and inter symbol interference (ISI). Frequency hopping and dehopping are performed in baseband digital domain that the carrier frequency offset impact is equal to that of single band systems. Simulation results show that in the severe channel, the residual timing error can be kept at a small scale which can be compensated by channel estimation and equalization. The performances of frequency synchronization and system error rate are high.