Joint Channel and Mismatch Correction for OFDM Reception with Time-interleaved ADCs: Towards Mostly Digital MultiGigabit Transce

— Time-interleaved (TI) analog-to-digital converters (ADCs) are a promising architecture for realizing the highspeed ADCs required to implement “mostly digital” receivers for emerging multiGigabit communication systems. Mismatch between the parallel ADCs comprising a TI-ADC is a fundamental performance bottleneck. While there exist mismatch correction techniques for generic applications of ADC, we illustrate in this paper that mismatch compensation can be subsumed within the overall receiver design for communication applications. We consider an Orthogonal Frequency Division Multiplexing (OFDM) link with TI-ADC used after downconversion. We show that mismatch results in frequency selective interference across subcarriers that can significantly degrade the performance of a standard OFDM receiver. However, this performance degradation can be alleviated significantly by joint channel and mismatch estimation and compensation, leveraging already available training or pilot sequences....

• Type: Conference
• Year: 2008
• Where: GLOBECOM
• Authors: P. Sandeep, Upamanyu Madhow, Munkyo Seo, Mark J. W. Rodwell
• Keywords: GLOBECOM 2008, Mismatch Correction, Mismatch Correction Techniques, Mismatch Estimation, Telecommunications