Frequency dependent iq mismatch calibration and compensation method based on fft operation
A compensation method and correlation technology, applied in receiver monitoring, electrical components, transmitter monitoring, etc., can solve the problems affecting the EVM of the transmitter and receiver, reduce the signal-to-noise ratio, and image signal interference, and achieve overall improvement. performance, improved accuracy, wide application effect
Active Publication Date: 2020-08-18
中科威发半导体(苏州)有限公司
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Problems solved by technology
The image signal interference generated by IQ mismatch will reduce the signal-to-noise ratio of the signal and affect the EVM of the transmitter and receiver
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Embodiment 1
[0028] Embodiment 1: a wireless broadband communication system includes two parts, an independent transmitter and a receiver, wherein a transmitting link (analog path of the transmitter) is formed in the transmitter, and a receiving link (analog path of the receiver) is formed in the receiver ), the frequency-dependent IQ mismatch analog calibration path of the receiver needs to connect the analog link of the transmitter and receiver for communication.
[0029] Reference attached figure 1 As shown, a method for calibrating and compensating the frequency-correlated IQ mismatch of the receiver for the above-mentioned 802.11ac wireless broadband communication system is achieved by adding a digital matched filter to the digital baseband I or Q of the receiver. It is realized by compensating the frequency-dependent IQ mismatch caused by analog filters and radio frequency devices in the analog receiving path. In this embodiment, the digital matched filter is added to the digital ba...
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The invention relates to a calibration and compensation method for frequency-dependent IQ mismatch based on FFT operation. The method compensates for the frequency-dependent IQ mismatch in the receiver by adding a digital matched filter to the I or Q channel of the receiver digital baseband in the wireless broadband communication system. Digital matched filter coefficients are obtained by a calibration algorithm, at that transmit, a composite calibration signal at a positive frequency point is transmitted, after the signal is calibrated, the frequency domain signal of each frequency point is obtained by FFT operation in the digital baseband of the receiver, according to the frequency domain signal of the positive frequency point and the frequency domain signal of the mirror negative frequency point, the deviation value of each frequency point to be compensated is calculated in turn, and the frequency domain deviation value is calculated by IFFT to obtain the tap coefficients of the digital matched filter. This method is suitable for calibration and compensation of frequency-dependent IQ mismatch in wideband wireless communication systems, and has a wide application range, especially for wideband OFDM systems.
Description
technical field [0001] The invention relates to a frequency correlation IQ mismatch calibration and compensation method based on FFT operation. Background technique [0002] Most modern wireless communication technologies use high-bandwidth and high-order modulation methods to achieve high-speed wireless transmission. For example, the latest wireless LAN standard 802.11ac protocol can optionally support 160M bandwidth and 256QAM modulation. The system design of high bandwidth and high-order modulation puts forward more stringent standards and requirements for the calibration and compensation of the non-ideal characteristics of the RF front-end . [0003] Affected by the inconsistent amplitude-frequency characteristics of IQ two-way filters, amplifiers and other devices in the analog baseband part, the gain mismatch and phase error caused by IQ mismatch are inconsistent at different frequency points, that is, IQ mismatch is frequency-related . The image signal interference...
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IPC IPC(8): H04B1/00H04B17/11H04B17/21
CPCH04B1/0042H04B17/11H04B17/21
Inventor 周立国崔秀伶彭锦
Owner 中科威发半导体(苏州)有限公司