| Universal Filter Multifrequency technology (UFMC), as an emerging air interface technology, has attracted wide attention in the field of satellite communication by the virtue of the characteristic of anti-frequency offset characteristic and low sensitivity to time-frequency synchronization. However, due to the limited computational power of the computing devices on satellite, traditional high computational complexity UFMC transmitters can not meet the stringent requirements of the computational complexity of satellite communication systems. Therefore,it is necessary to develop a new low complexity UFMC transmitter to meet the demand of algorithm with low computational complexity in the satellite communication systems, and to make UFMC better used in the satellite communication systems. In order to solve the problems above, a new low complexity UFMC transmitter is proposed creatively in this paper.In this thesis, we firstly propose a UFMC transmitter based on small-size IFFT, which combines small-size IFFT, time-domain interpolator and low-pass filter together to reduce the computational complexity of the transmitter. Then, on the basis of the small-size IFFT based UFMC transmitter, a new UFMC transmitter which realized by polyphaser structures is proposed in this paper. The polyphaser structures based UFMC transmitter can further reduce the computational complexity of the UFMC transmitter significantly. An obvious advantage of the low complexity UFMC transmitters proposed in this paper is that they can ensure the accuracy of the signal and not bring the signal amplitude error or phase error.In order to verify the effectiveness of the proposed low-complexity UFMC transmitter, this paper uses TI TMS320C6748 digital signal processor as the hardware test platform to test the function and performance of the new UFMC transmitter. The hardware test results show that the new UFMC transmitter proposed in this paper can effectively reduce the computing cost of the hardware device while ensuring the system performance not affected. |
