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- Title
An identification of the tolerable time-interleaved analog-to-digital converter timing mismatch level in high-speed orthogonal frequency division multiplexing systems.
- Authors
Dung Huynh, Vo Trung; Mai, Linh; Do, Hung Ngoc; Truong Nguyen, Minh Ngoc; Pham, Trung Kien
- Abstract
High-speed Terahertz communication systems has recently employed orthogonal frequency division multiplexing approach as it provides high spectral efficiency and avoids inter-symbol interference caused by dispersive channels. Such high-speed systems require extremely high-sampling time-interleaved analog-to-digital converters at the receiver. However, timing mismatch of time-interleaved analog-to-digital converters significantly causes system performance degradation. In this paper, to avoid such performance degradation induced by timing mismatch, we theoretically determine maximum tolerable mismatch levels for orthogonal frequency division multiplexing communication systems. To obtain these levels, we first propose an analytical method to derive the bit error rate formula for quadrature and pulse amplitude modulations in Rayleigh fading channels, assuming binary reflected gray code (BRGC) mapping. Further, from the derived bit error rate (BER) expressions, we reveal a threshold of timing mismatch level for which error floors produced by the mismatch will be smaller than a given BER. Simulation results demonstrate that if we preserve mismatch level smaller than 25% of this obtained threshold, the BER performance degradation is smaller than 0.5 dB as compared to the case without timing mismatch.
- Subjects
ORTHOGONAL frequency division multiplexing; PULSE amplitude modulation; RAYLEIGH fading channels; GRAY codes; ANALOG-to-digital converters; BIT error rate; TERAHERTZ technology; TIME perception
- Publication
International Journal of Electrical & Computer Engineering (2088-8708), 2022, Vol 12, Issue 2, p1667
- ISSN
2088-8708
- Publication type
Article
- DOI
10.11591/ijece.v12i2.pp1667-1674