2D curtailed harmonic memory polynomial for reduced complexity in concurrent dual‐band modelling and digital predistortion with the second band at harmonic frequency. Issue 12 (29th June 2018)

• Record Type: Journal Article
• Authors: Jaraut, Praveen; Rawat, Meenakshi; Ghannouchi, Fadhel M.
• Is Part Of: IET communications. Volume 12:Issue 12(2018)
• Page Start: 1438
• Page End: 1447
• Publication Date: 2018-06-29
• Subjects: computational complexity -- radio transmitters -- 5G mobile communication -- 4G mobile communication -- power amplifiers -- radiofrequency interference -- intermodulation distortion -- polynomials -- linearisation techniques -- signal processing; 2D curtailed harmonic memory polynomial -- reduced complexity -- concurrent dual‐band modelling -- digital predistortion -- harmonic frequency -- multiband transmitter systems -- 5G communication systems -- 4G communication systems -- ultra‐wideband power amplifiers -- multiband power amplifiers -- second carrier signal -- harmonic interference -- intermodulation distortion components -- IMD components -- cross‐modulation -- interference terms -- two‐dimensional curtailed harmonic memory polynomial model -- harmonic interferences -- model complexity -- 2D‐CHMP DPD model -- computational complexity -- linearisation performances -- principal component analysis; Telecommunication systems -- Periodicals; Speech processing systems -- Periodicals; 621.38205
• DOI: 10.1049/iet-com.2017.1376
• Languages: English
• ISSNs: 1751-8628

Abstract

Abstract : Multi‐band transmitter systems are evolving to support the smooth transition from 4G to 5G communication systems. Moreover, recent developments of multi‐band and ultra‐wideband power amplifiers have led to a possible scenario where the second carrier signal is transmitted at the harmonic frequency of the first carrier signal. This results in harmonic interference from the first carrier signal as well as additional cross‐modulation and intermodulation distortion (IMD) components, which cannot be filtered out. The computational and memory requirements for digital predistortion (DPD) in such scenario increase drastically to include all interference terms. This study presents a novel two‐dimensional curtailed harmonic memory polynomial (2D‐CHMP) model to capture harmonic interferences, cross‐modulation and IMDs. The model complexity and memory requirement of 2D‐CHMP are very less as compared to the state‐of‐the‐art two‐dimensional harmonic memory polynomial (2D‐HMP) model. For proof‐of‐concept, it is shown with two different measurement setups that the proposed 2D‐CHMP DPD provides similar linearisation performances as compared to the 2D‐HMP DPD with less number of coefficients and computational complexity. As a study, it is shown that the proposed model can be further adapted to a low‐precision (low‐bit) environment by utilising principal component analysis.