RSFQ Baseband Digital Signal Processing

Anna Yurievna HERR  

IEICE TRANSACTIONS on Electronics   Vol.E91-C    No.3    pp.293-305
Publication Date: 2008/03/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e91-c.3.293
Print ISSN: 0916-8516
Type of Manuscript: Special Section INVITED PAPER (Special Section on Recent Progress in Superconductive Digital Electronics)
digital signal processing (DSP),  multiuser detection,equalization,  blind detection,  matrix multiplication,  multiply-accumulate (MAC),  flux quantum,  rapid single-flux quantum (RSFQ),  single-flux quantum (SFQ),  

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Ultra fast switching speed of superconducting digital circuits enable realization of Digital Signal Processors with performance unattainable by any other technology. Based on rapid-single-flux technology (RSFQ) logic, these integrated circuits are capable of delivering high computation capacity up to 30 GOPS on a single processor and very short latency of 0.1 ns. There are two main applications of such hardware for practical telecommunication systems: filters for superconducting ADCs operating with digital RF data and recursive filters at baseband. The later of these allows functions such as multiuser detection for 3G WCDMA, equalization and channel precoding for 4G OFDM MIMO, and general blind detection. The performance gain is an increase in the cell capacity, quality of service, and transmitted data rate. The current status of the development of the RSFQ baseband DSP is discussed. Major components with operating speed of 30 GHz have been developed. Designs, test results, and future development of the complete systems including cryopackaging and CMOS interface are reviewed.