Research Of Key Technologies In Imperfect Reconstruction Filter Bank Multi-Carrier

Filter bank multicarrier (FBMC) has been considered to be a more effective multicarrier modulation solution in the upcoming 5G cellular communication than the well-known orthogonal frequency division multiplexing (OFDM). Different with OFDM, FBMC uses filter banks for the synthesis and analysis of multicarrier signals, which can be designed with arbitrary small lobes to satisfy the communication requirements. In this thesis, we propose an imperfect reconstruction (IPR) FBMC system based on the exponential modulation. Along with the system design, a receiving algorithm characterizing single-subband equalization with iterative interference cancellation (SSE-IIC) is proposed. In order to improve the performance in multipath fading channel, we further propose an optimal prototype filter design which is derived from Shannon formula. Furthermore, an improved receiver based on oversampling and diversity combining is proposed.Firstly, the background of 5G communication is introduced with an emphasis on the potential of FBMC in the waveform design of the upcoming 5G cellular communication.Secondly, the fundamental theory of filter banks is illustrated along with some elementary operations of the multirate signal system.Thirdly, an imperfect reconstruction FBMC system based on the exponential modulation is designed. And a receiving algorithm characterizing SSE-IIC is proposed. After several iterations, a satisfactory bit error rate (BER) performance can be achieved with the proposed system in additive white Gaussian noise (AWGN) channel, while the BER performance in multipath channel is rather poor with the original prototype filter design.Then, the prototype filter design is given along with the optimization method. The original prototype filter design is using the weighted constrained-least-squares (CLS) technique based on the golden section line searches. Due to its bad performance in multipath channels, an optimal prototype filter design which is derived from Shannon formula is proposed and analyzed by simulation. The optimized system can achieve much better BER performance than the original one under the multipath condition.Finally, an improved receiver characterizing oversampling and diversity combining proposed to further improve the BER performance of the IPR FBMC system based on a critically sampled transmitter. The simulation results show that the BER performance of the system using the receiver characterizing oversampling and diversity combining has an overwhelming triumph over the critically sampled one.