Quadrature error correction using polynominal models in tone calibration

A polynomial model and tone calibration technology, applied in multi-carrier systems, modulated carrier systems, receiver monitoring, etc., can solve the problem of reduced effectiveness and achieve the effect of strong noise robustness

Active Publication Date: 2014-09-17
ANALOG DEVICES INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These known techniques are less effective in environments with high noise levels or when the test tone signal jitter rises above a certain level

Method used

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  • Quadrature error correction using polynominal models in tone calibration
  • Quadrature error correction using polynominal models in tone calibration
  • Quadrature error correction using polynominal models in tone calibration

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Embodiment Construction

[0023] now refer to figure 1 , shows a simplified functional block diagram of the test system 100 according to an exemplary embodiment of the present disclosure. The test system 100 includes a test device 101 and a receiver 102 . The test setup 101 includes a tone generator 104 , a transform processor 106 , a tone alignment (TCAL) estimator 108 and a polynomial alignment (PCAL) estimator 110 . exist figure 1 , the receiver 102 represents the receiver to be calibrated using the test device 101 . The receiver 102 includes a low noise amplifier (LNA) 112 , a mixer 114 , a digital processor block 118 and a quadrature error correction (QEC) processor block 120 . Mixer 114 includes a local oscillator (LO) 126 and multipliers 128a and 128b. The analog path of receiver 102 includes separate I-channel and Q-channel processing paths for received in-phase (I) and quadrature-phase (Q) signals. The analog paths include an I-channel analog path through multiplier 128a, transimpedance a...

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Abstract

One example embodiment provides a system, apparatus, and method for using polynomial models in tone calibration for quadrature error correction in I/Q receivers. In one example embodiment, method for calibrating an I/Q receiver is provided and includes receiving a first mismatch parameter indicating a mismatch between I and Q channels of the I/Q receiver; and estimating a second mismatch parameter from the first mismatch parameter using a polynomial model.

Description

[0001] priority information [0002] This application claims priority to Provisional Patent Application Serial No. 61 / 798,197, filed March 15, 2013, which is hereby incorporated by reference in its entirety. technical field [0003] The present disclosure relates generally to in-phase and quadrature (I / Q) receiver signal processing, and more particularly to an apparatus, method and system for calibrating gain and phase imbalance in an I / Q receiver. Background technique [0004] Quadrature modulation is a technique used to transmit communication signals. In quadrature modulation, the transmitter transmits data on both the in-phase (I) and quadrature-phase (Q) channels simultaneously. Each of the I and Q channels carries a separate data stream and is phase shifted 90 degrees relative to each other on the carrier frequency. In an I / Q receiver, the I and Q channel signals are received at the carrier frequency, down converted and demodulated to recover the data from the individ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/38
CPCH04L27/38H04B17/21H04L27/3863
Inventor W·安R·P·舒博特Y·斯坦
Owner ANALOG DEVICES INC
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