System Architecture for 3GPP-LTE Modem using a Programmable Baseband Processor

Authors:
Di Wu;Johan Eilert;Rizwan Asghar;Dake Liu;Anders Nilsson;Eric Tell;Eric Alfredsson
Affiliations:
Linköping University, Sweden;Linköping University, Sweden;Linköping University, Sweden;Linköping University, Sweden;Coresonic AB, Sweden;Coresonic AB, Sweden;Coresonic AB, Sweden
Venue:
International Journal of Embedded and Real-Time Communication Systems
Year:
2010

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Abstract

The evolution of third generation mobile communications toward high-speed packet access and long-term evolution is ongoing and will substantially increase the throughput with higher spectral efficiency. This paper presents the system architecture of an LTE modem based on a programmable baseband processor. The architecture includes a baseband processor that handles processing time and frequency synchronization, IFFT/FFT up to 2048-p, channel estimation and subcarrier de-mapping. The throughput and latency requirements of a Category four User Equipment CAT4 UE is met by adding a MIMO symbol detector and a parallel Turbo decoder supporting H-ARQ, which brings both low silicon cost and enough flexibility to support other wireless standards. The complexity demonstrated by the modem shows the practicality and advantage of using programmable baseband processors for a single-chip LTE solution.