I/Q不平衡Compensator

补偿同步和四之间的不平衡rature components

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RF Impairments Correction

Description

TheI/Q不平衡Compensatormitigates the effects of an amplitude and phase imbalance between the in-phase and quadrature components of a modulated signal. The supported modulation schemes include OFDM, M-PSK, and M-QAM, where M > 2.

This block accepts up to three input ports, of which one is the input signal. When you set theSource of compensator coefficientparameter toEstimated from input signal, two additional input ports are enabled. The first is enabled when you set theSource of adaptation step sizeparameter toInput portand the second is enabled when you check theCoefficient adaptation input portbox. The two options are independent. Additionally, you can check theEstimated coefficient output portbox to create an optional output port from which the estimated compensator coefficients are made available.

When you set theSource of compensator coefficientparameter toInput port，只有一种可能的配置（输入信号端口，系数输入端口和输出信号端口）。

Parameters

Source of compensator coefficient: Specify the source of the compensator coefficients asEstimated from input signal或者Input port. If set toEstimated from input signal, the compensator calculates the coefficients from the input signal. If set toInput port, all other properties are disabled and you must provide the coefficients through the input port. The default value isEstimated from input signal.
Initial compensator coefficient: Specify the initial coefficient used by the internal algorithm to compensate for the I/Q imbalance. The default value is0+0j.
Source of adaptation step size: Specify the source of the adaptation step size asProperty或者Input port. If set toProperty, specify the step size in theAdaptation step sizefield. If set toInput port, you must specify the step size through an input port. The default value isProperty.
Adaptation step size: Specify the step size of the adaptation algorithm as a real scalar. This parameter is available only whenSource of adaptation step size被设定为Property. The default value is0.00001.
Coefficient adaptation input port: 选择此复选框以创建一个输入端口，该输入端口允许信号控制适应过程。如果选择了复选框，并且输入信号是真的, the estimated compensation coefficients are updated. If the adaptation port is not enabled or if the input signal isfalse, the compensation coefficients do not change. By default, the check box is not selected.
Estimated coefficient output port: Select this check box to provide the estimated compensation coefficients to an output port. By default, the check box is not selected.

Algorithms

该块实现了算法，输入和输出comm.IQImbalanceCompensatorreference page. The object properties correspond to the block parameters.

Supported Data Types

Port	Supported Data Types
信号输入	双精度浮点单精度浮点
Signal Output	双精度浮点单精度浮点
Step Size	双精度浮点单精度浮点
Adaptation	Logical
Input Coefficients	双精度浮点单精度浮点
输出系数	双精度浮点单精度浮点

参考

[1] Anttila，L.，M。Valkama和M. Renfors。“正交无线电接收器中的频率选择I/Q失衡的盲赔偿：基于循环的方法。”Proc。IEEE ICASSP。2007年，第III-245页-III-248。

[2] Kiayani, A., L. Anttila, Y. Zou, and M. Valkama, "Advanced Receiver Design for Mitigating Multiple RF Impairments in OFDM Systems: Algorithms and RF Measurements." Journal of Electrical and Computer Engineering. Vol. 2012.