| MC-CDMA is a multi-carrier modulation method presented for broadband mobile communications. The principles, schemes and performances of MC-CDMA are illustrated in this thesis. The model of Time-varying Multi-path is analyzed and realized. And key technologies of MC-CDMA, channel estimations and diversity combinations, are mainly studied for the application of MC-CDMA.The channel estimation based on pilot carriers is analyzed, and an improved method with Wiener filtering is presented. Simulations of the method are carried in time-varying multi-path channel. Errors and BER performances with various system parameters are analyzed and compared, so the validity of the amendment is proved. After channel estimations, various diversity combinations are discussed with various user numbers and SNR. And some useful conclusions are achieved. |
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