摘要
讨论了非静止轨道移动卫星通信中DS/CDMA(直接序列扩频码分多址)QPSK(QuaternaryPhaseShiftKeying)调制的误码性能。以莱斯衰落信道为基础,考虑卫星覆盖仰角对误码率的影响,推导了误码率的解析表达式。给出了计算机仿真数值曲线,并对仿真结果进行了讨论。通过在相同误码率以及不同仰角情况下扩频调制同窄带QPSK调制信噪比恶化量的比较,可以看出扩频调制对误码性能有很大的改善。得出的结论对进一步评价系统的分组错误概率、吞吐量以及抗衰落技术的选择具有重要的意义。
The DS/CDMA bit error performance of QPSK(Quaternary Phase Shift Keying) modulation of non\|static earth orbiting mobile satellite communication is discussed. Based on Rice fading channel, and taking the effect of bit error rate of the angle of elevation of satellite coverage into account, A bit error rate formula and computer simulation figures are given. In addition, the simulation results are analyzed. Through the comparison of signal to noise ratio aggravation at same bit error rate and variant angle of elevation, it is clear that the bit error performance of spread spectrum modulation is highly improved. This analysis result is significant for the further estimation of group error rate, throughput of the satellite communication system, and the option of anti\|fade technology.
出处
《吉林大学学报（信息科学版）》
CAS
2003年第1期31-34,共4页
Journal of Jilin University（Information Science Edition）
基金
国家自然科学基金资助项目(60172046)
