access icon free Improved baseband digital predistortion for linearising PAs with nonlinear memory effects using linearly interpolated LUT

An improved baseband digital predistortion (DPD) solution to reduce the nonlinearity of power amplifiers (PAs) with memory effects is proposed. It is based on the memory polynomial (MP) model and linearly interpolated look-up table (LUT). This predistorter reduces significantly the computational time needed in MP based DPD by using a LUT. A linear interpolation technique is introduced to enhance the indexing of the LUT, such that good performance with small table size and low computational complexity is achieved. The proposed solution is validated on a test bench by using a PA ZFL-2500 driven by a 16QAM modulated signal.

Inspec keywords: quadrature amplitude modulation; polynomials; interpolation; computational complexity; circuit testing; table lookup; benchmark testing; power amplifiers

Other keywords: memory polynomial model; linear interpolation technique; computational complexity; nonlinear memory effect; MP model; look-up table; DPD; power amplifier; PA ZFL-2500; bench testing; LUT; improved baseband digital predistortion solution; 16QAM modulated signal

Subjects: Amplifiers; Interpolation and function approximation (numerical analysis)

References

    1. 1)
      • 3. Cottais, E., Wang, Y., Toutain, S.: ‘A new adaptive baseband digital predistortion technique’, Eur. Microw. Assoc., 2006, 2, pp. 154159.
    2. 2)
      • 5. Kim, J., Konstantinou, K.: ‘Digital predistortion of wideband signals based on power amplifier model with memory’, Electron. Lett., 2001, 37, (23), pp. 14171418 (doi: 10.1049/el:20010940).
    3. 3)
      • 1. Cabarkapa, M., Neskovic, N., Neskovic, A., Budimir, D.: ‘Adaptive nonlinearity compensation technique for 4G wireless transmitters’, Electron. Lett., 2012, 48, (20), pp. 13081309 (doi: 10.1049/el.2012.2829).
    4. 4)
      • 6. Ghannouchi, F.M., Hammi, O.: ‘Behavioral modeling and predistortion’, IEEE Microw. Mag., 2009, 10, (7), pp. 5264 (doi: 10.1109/MMM.2009.934516).
    5. 5)
      • 2. Kwan, A.K., Bassam, S.A., Helaoui, M., Ghannouchi, F.M.: ‘Concurrent dual band digital predistortion using look up tables with variable depths’. 2013 IEEE Topical Conf. Power Amplifiers for Wireless and Radio Applications (PAWR), Santa Clara, CA, USA, January 2013, pp. 2527.
    6. 6)
      • 4. Li, F., Feuvrie, B., Wang, Y., Chen, W.: ‘MP/LUT baseband digital predistorter for wideband linearisation’, Electron. Lett., 2011, 47, (19), pp. 10961098 (doi: 10.1049/el.2011.2254).
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2013.2458
Loading

Related content

content/journals/10.1049/el.2013.2458
pub_keyword,iet_inspecKeyword,pub_concept
6
6
Loading