无线电通信技术
無線電通信技術
무선전통신기술
RADIO COMMUNICATIONS TECHNOLOGY
2011年
5期
9-12
,共4页
吴团锋%徐友云%归琳%马文峰
吳糰鋒%徐友雲%歸琳%馬文峰
오단봉%서우운%귀림%마문봉
数字卫星移动突发通信系统%π/4-DQPSK%多普勒频移%独特码%判决反馈PLL环
數字衛星移動突髮通信繫統%π/4-DQPSK%多普勒頻移%獨特碼%判決反饋PLL環
수자위성이동돌발통신계통%π/4-DQPSK%다보륵빈이%독특마%판결반궤PLL배
digital satellite mobile burst communication system%π/4-DQPSK%Doppler frequency shift%unique word%decision feedback PLL
提出了一种适用于数字卫星移动突发通信系统的多普勒频移快捕和跟踪方法。该方法根据突发通信时帧结构的特点，利用独特码的调制输出进行多普勒频移的快捕，并根据π/4-DQPSK信号的特点，采用判决反馈PLL环跟踪多普勒频移的变化。仿真结果表明，采用该方法的解调器误比特率．Pb与成形滤波器的滚降系数n无关。多普勒频移在-Rs／2～Rs／2范围内变化时，对解调器的误比特率Pb没有影响。
提齣瞭一種適用于數字衛星移動突髮通信繫統的多普勒頻移快捕和跟蹤方法。該方法根據突髮通信時幀結構的特點，利用獨特碼的調製輸齣進行多普勒頻移的快捕，併根據π/4-DQPSK信號的特點，採用判決反饋PLL環跟蹤多普勒頻移的變化。倣真結果錶明，採用該方法的解調器誤比特率．Pb與成形濾波器的滾降繫數n無關。多普勒頻移在-Rs／2～Rs／2範圍內變化時，對解調器的誤比特率Pb沒有影響。
제출료일충괄용우수자위성이동돌발통신계통적다보륵빈이쾌포화근종방법。해방법근거돌발통신시정결구적특점，이용독특마적조제수출진행다보륵빈이적쾌포，병근거π/4-DQPSK신호적특점，채용판결반궤PLL배근종다보륵빈이적변화。방진결과표명，채용해방법적해조기오비특솔．Pb여성형려파기적곤강계수n무관。다보륵빈이재-Rs／2～Rs／2범위내변화시，대해조기적오비특솔Pb몰유영향。
This paper presents a new algorithm of rapid acquisition and tracking of Doppler frequency shift for π/4-DQPSK signals, which is suitable for digital satellite mobile burst communication system. The Doppler frequency shift acquisition is performed by modulated signals of unique word and the decision feedback PLL is employed to track Doppler frequency shift. The simulation results show that the performance of demodulator is independent of rolloff-factor a, and the simulation results also indicate that Doppler frequency shift range from - Rs/2 - Rs/2 has no effect on bit error rate Pb.
