Synchronization Acquisition For MIMO-OFDM Systems

Multiple-Input Multiple-Output (MIMO) technique is of great value to research which boosts channel capacity and spectral efficiency greatly. Another technique, Orthogonal Frequency Division Multiplexing (OFDM) has been paid more and more attention because of its high spectrum efficiency and robust capability of decreasing multi-path interference. As the combination of these two technology ,MIMO-OFDM technique is good for increasing both channel capacity and spectral efficiency and will be the core of the 4G wireless system.This dissertation deals with the problem of frame synchronization in MIMO-OFDM system. First we summarize the current research of MIMO-OFDM synchronization methods, according to the data aided and non-data aided methods. We classify the current synchronization methods, including implement of training sequences, cycle prefix, and non-data aided methods. In this dissertation we use training sequence for synchronization under burst transmitting mode.Similar to the OFDM system, the MIMO-OFDM system is extremely sensitive to phase deviation caused by errors in synchronization, Inter-Carrier Interference (ICI) caused by the carrier frequency deviation and sampling frequency deviation greatly deteriorate system performance. A new frame synchronization technique, which is robust to carrier frequency and phase errors, is proposed for MIMO-OFDM. With the improved frame detection and training sequence we proposed we complete these synchronization approaches and obtain simulation results, analyze the synchronization performances, and obtain final results.At present, many researches on the key algorithms of MIMO-OFDM have been just done in theory or at the stage of computer simulation. So a Non-Real-Time MIMO Testbed is established to make sure the right and the reliability of algorithms.