.16 Qam All-digital Receiver

This paper mainly investigates several important problems of all-digital receiver, and intends to propose digital signal processing algorithms for receiver, which is fit to be realized with DSP^ FK^ ASIC devices. Firstly, the paper introduces the character and the development of all-digital receiver, then an adaptive threshold correlation detection algorithm has been presented. For symbol synchronization, a filtering and squaring algorithm of estimating the timing error has been introduced, and a method to improve the accuracy of estimated data has been presented, then two signal interpolation filter have been analyzed, one is FIR interpolation filter, another is cubic interpolation filter. For carrier synchronization, a method of estimating the ofiset of carrier frequency has been presented, which has a more broad range of the estimated oflset of carrier fiequency and more accurate result man other methods, then, a method of estimating the carrier complex phase has been presented, which corrects directly the ofiset of carrier phase. Final, a 16QAM all-digital receiver has been designed and simulated applying all researched algorithms, and the main DSP program has been completed for verify it's effective and feasible.