摘要
偏移四相相移键控(OQPSK)是一种适用于在限带非线性信道中使用的高效恒包络数字调制技术。OQPSK调制器的不均衡以及放大器的非线性对接收机的性能具有非常大影响。由于不均衡对载波跟踪环路的稳态锁定点的影响,使得平均误比特率(BEP)的性能受到了的决定性影响。通过对OQPSK调制器不均衡的模型讨论,深刻分析了调制器不均衡对载波跟踪环路稳态锁定点和平均BEP的影响。
The offset quadrature phase-shift-keyed （OQPSK） is an effective digital constant envelope modulation for band-limited nonlinear channel. The OQPSK modulator imbalance and amplifier nonlinearity have a deleterious effect on the receiver performance. With regarding to OQPSK modulator imbal- ances, the primary source of degradation comes about because of the effect of the imbalance on the steady-state lock point of the cartier tracking loop, which has a direct impact on the determination of accurate average BEP performance. We begin our discussion with a description of an imbalance OQPSK model , then analyze the effect on cartier tracking loop steady-state lock point and the effect on average BEP.
出处
《西安科技大学学报》
CAS
北大核心
2007年第1期98-103,共6页
Journal of Xi’an University of Science and Technology
基金
国家自然科学基金(No.60152024)
