Using Information Bits in Small Cycles as Pilot

Pilot is usually used for synchronization and channel estimation in communication system.Inevitably, it decreases the efficiency of band.In this paper, we propose a method of locating information nodes that involve in small cycles of LDPC codes and using these nodes as pilot.In this method, the located information nodes are assigned with definite values.Therefore, pilot will be part of the encoded codes.Simulation result shows, as for a random (1 000, 500) LDPC codes, when 50 information bits are selected as pilot and maxim iteration are set as 10, the performance can be improved dramatically.In this way, Pilot still functions to synchronize.Moreover, its definite information is helpful to utilize small cycles to improve performance of LDPC.