Gain/phase imbalance cancellation technique in LINC transmitters

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Gain/phase imbalance cancellation technique in LINC transmitters

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Published

A new technique for correcting the gain/phase imbalance in LINC transmitters is presented. The technique employs a feedback signal to generate an error signal, consisting mainly of intermodulation distortion. A direct search method is used to optimise the gain/phase imbalance for correction. An out-of-band radiation suppression of 10 dB was achieved using a signal processing workstation simulation package.

Inspec keywords: amplification; feedback; radio transmitters; intermodulation distortion; error correction

Other keywords: communication transmitters; direct search method; error signal generation; phase errors; LINC transmitters; gain/phase imbalance cancellation technique; broadcast transmitters; feedback signal; IMD; out-of-band radiation suppression; intermodulation distortion; signal processing workstation simulation package

Subjects: Radio links and equipment; Radio and television transmitters

References

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      • D.C. Cox . Linear amplification with nonlinear components. IEEE Trans. , 1942 - 1945
    2. 2)
      • L. Sundström . The effect of quantization in a digital signal component separator forLINC transmitters. IEEE Trans. , 2 , 346 - 352
    3. 3)
      • S. Tomisato , K. Chiba , K. Murota . Phase error free LINC modulator. Electron. Lett. , 9 , 576 - 577
    4. 4)
      • L. Sundström . Automatic adjustment of gain and phase imbalances in LINC transmitters. Electron. Lett. , 3 , 155 - 156
    5. 5)
      • A. Mansell , A. Bateman . Transmitter linearisation using composite modulation feedback. Electron. Lett. , 23 , 2120 - 2121
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