Effect of Time-Interleaved Analog-to-Digital Converter Mismatches on OFDM Performance

Konferenz: OFDM 2014 - 18th International OFDM Workshop 2014 (InOWo'14)
27.08. - 28.08.2014 in Essen, Deutschland

Tagungsband: Proceedings of the 18th International OFDM Workshop 2014 (InOWo’14)

Seiten: 8Sprache: EnglischTyp: PDF

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Huynh, Vo-Trung-Dung; Noels, Nele; Steendam, Heidi (Department of Telecommunications and Information Processing, Ghent University, Belgium)
Rombouts, Pieter (Department of Electronics and Information Systems, Ghent University, Belgium)
Armstrong, Jean (Department of Electrical and Computer Systems Engineering, Monash University, Australia)

For the extremely high sampling rate and high resolution required for multi-Gigabit orthogonal frequency division multiplexing (OFDM) communication systems, time-interleaved analog-to-digital converters (ADCs) are being considered. However, in practice, mismatches such as offset mismatch, gain mismatch and timing mismatch occur between the parallel sub-ADCs. This paper theoretically analyzes the impact of the different mismatches on the performance of the OFDM system. The theoretical results are confirmed by simulations and show that OFDM performance is strongly degraded, even for small mismatches.