首页>
外国专利>
Phase noise and additive noise estimation in a QAM demodulator
Phase noise and additive noise estimation in a QAM demodulator
展开▼
机译:QAM解调器中的相位噪声和加性噪声估计
展开▼
页面导航
摘要
著录项
相似文献
摘要
A QAM demodulator having a carrier recovery circuit that includes a phase estimation circuit and an additive noise estimation circuit which produces an estimation of the residual phase noise and additive noise viewed by the QAM demodulator. The phase noise estimation is based on the least mean square error between the QAM symbol decided by a symbol decision circuit and the received QAM symbol. The additive noise estimation is based on the same error as in the phase noise estimation, except that it is based only on QAM symbols having the minimum amplitude on the I and Q coordinates. The additive noise estimation is not dependent on the phase of the signal, thus, is independent of the phase noise estimator.
展开▼