An implementation of turbo equalization using cyclic prefix in LTE downlink system

In this paper, an implementation of turbo equalization using cyclic prefix in LTE downlink system is proposed. In comparison with conventional equalization schemes, the using of cyclic prefix can enhance the SNR performance by about 1 dB in AWGN channel and more in multi-path channel with Doppler frequency influence [3]. In this paper, the turbo equalizer presented in [3] is extended to 16QAM and 64QAM to support LTE system. Furthermore turbo encoder and decoder, scrambler and interleaver are designed according to the demands of LTE standard. The simulation results show that the algorithms can achieve ideal performance enhancement in LTE system comparing to conventional schemes.