Design and Simulation of Turbo Codes' Interleaver in Helicopter Satellite Communication System
Xiao Chuang-chuan · Telecommunication Engineering · 2014
In Helicopter Satellite Communication System( HSCS),the rotor shield will result in the deteriorative performance of the system. The codes can be partly punctured by the rotor shield and it is an imperative problem. Through the analysis of the punctured Turbo codes,a new interleaver which can be well applied in this system is proposed. The characters that the interleaver satisfies include( 1) dispersing the punctured code chips among all the chips and turning burst errors into random errors,( 2) both systematic and parity outputs of the same information bit should be deleted only one bit,( 3) reserving the neighborhoods of the punctured bit field,( 4) the punctured bits should folow the cycle model of systematic bit—the first parity bit—the second parity bit. Finally,comparison between the new pattern interleaver and the conventional ones shows that the former one makes the code's bit error rate( BER) performance obtain more amelioration and improves the HSCS' communication reliability.