Analytical framework and bandwidth optimisation of orthogonal frequency division multiplexing low-order multi-channel filter-bank receivers for achieving sampling clock-jitter robustness

摘要

Stringent jitter specifications in the sampling clocks severely limit the evolution of future generations of wideband high-performance receivers. For instance, it is shown that a conventional single-channel receiver requires 1.5 ps of jitter standard deviation to achieve 34 dB signal-to-noise ratio (SNR) when sampling a 10 GHz orthogonal frequency division multiplexing (OFDM) signal. This study presents an analytical framework for the design of jitter-tolerant multi-channel filterbank OFDM receivers. Additionally, the study presents an optimisation method for the filter-bank bandwidth that is able to reduce the filter-bank order saving power and area and achieving optimal signal quality. Simulations that confirm the analytical result show that 34 and 38 dB SNR are achieved with 5-channel and 10-channel receivers, respectively, when using second-order bandwidth-optimised filter-bank that samples a 10 GHz OFDM signal tolerating 6 ps of jitter.