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Local oscillation leakage elimination apparatus and method

A technology of local oscillator leakage and local oscillator signal, applied in electrical components, multi-carrier systems, transmission systems, etc., can solve the problems of high cost, complex algorithm, slow speed, etc., and achieve simple, cost-saving and accurate control of local oscillator. The effect of leak elimination

Inactive Publication Date: 2009-06-10
PANASONIC CORP
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  • Claims
  • Application Information

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Problems solved by technology

However, this method has the problems of complex algorithm, slow speed and high cost.

Method used

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  • Local oscillation leakage elimination apparatus and method
  • Local oscillation leakage elimination apparatus and method
  • Local oscillation leakage elimination apparatus and method

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Embodiment Construction

[0021] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings, and unnecessary details and functions for the present invention will be omitted during the description to prevent confusion to the understanding of the present invention.

[0022] Refer below figure 2 A transmitter configured with a local oscillator leakage canceling device according to one embodiment of the present invention is described.

[0023] figure 2 is a block diagram showing the configuration of a zero-IF transmitter having a local oscillator leakage canceling device according to an embodiment of the present invention. Such as figure 2 As shown, according to this embodiment, the transmitter with the local oscillator leakage elimination device includes a baseband digital domain part 206, a digital-to-analog converter 207, a low-pass filter 208, a quadrature modulator 209, a local oscillator signal generator 210, the first A coupler 211, a rad...

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Abstract

The invention discloses a device for eliminating local oscillation leakage. During operation, the device comprises: generating an intermediate frequency auxiliary signal with adjustable amplitude and phase in a baseband digital domain and converting the intermediate frequency auxiliary signal into an analog radio-frequency modulation signal; converting the intermediate frequency auxiliary signal into a negative local oscillation signal with the frequency and amplitude identical to those of a local oscillation leakage signal and the phase opposite to that of the local oscillation leakage signal; and offsetting the negative local oscillation signal and the local oscillation leakage signal to realize the function of eliminating local oscillation leakage. The device can carry out dynamic adjustment of signal amplitude and phase in a digital domain through the adoption of a trial-and-error method according to the offset local oscillation leakage state till the local oscillation leakage signal meets requirements. Because the signal offsetting the local oscillation leakage signal is generated in the digital domain, the amplitude and phase of the signal can be adjusted accurately. The device has a simple method and can quickly realize accurate control of local oscillation leakage elimination. In addition, the device does not influence the normal operation of a transmitter during adjustment.

Description

technical field [0001] The present invention relates to a device and method for eliminating local oscillator leakage, in particular to a device and method for eliminating local oscillator leakage signals in zero-IF transmitters, which can eliminate local oscillator leakage in real time and reduce non-useful signals generated by frequency converters . Background technique [0002] In the field of wireless communication, a traditional transmitter consists of a baseband unit, a digital-to-analog conversion unit, a frequency conversion unit, an amplification unit, and a filter unit. Among them, the transmitter completes the shift of the signal spectrum through the frequency converter. In the process of frequency conversion, some non-useful signals will inevitably be generated, such as local oscillator leakage, other sideband signals, and harmonic signals. These undesired signals will have different effects in different transmitter structures. It may affect the subsequent powe...

Claims

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Application Information

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IPC IPC(8): H04B1/04H04L27/32
Inventor 赵炎
Owner PANASONIC CORP
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