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Tuesday, June 29, 2010

Lattice and Affarii put remote radio head on FPGA


By Nick Flaherty

Lattice Semiconductor and Affarii Technologies have demonstrated the industry’s lowest cost, low power Remote Radio Head (RRH) solution at 1300mW per antenna. The integration of all RRH processing has been achieved on a single LatticeECP3-150 device.
The single chip solution supports 2x2 MIMO configurations for WCDMA, LTE and WiMAX applications and is part of an overall RRH hardware evaluation platform jointly
developed by Lattice and Affarii. The platform is comprised of the RF front-end, high-speed
data conversion devices and the digital signal processing portion. The functionality of the full
signal path package includes DDC/DUC, DPD, CFR and CPRI IP cores, supports multi-carrier
waveforms up to 20MHz bandwidth and is compatible with Class AB and Doherty amplifiers
using LDMOS and GaN transistors.
All features of this RRH solution, both hardware and soft IP, are fully integrated and supported by Lattice’s latest generation of design tools.
The RRH solution is built using Affarii’s digitalTRX technology that includes Digital Up/Down Converter (DUC/DDC), Crest Factor Reduction (CFR) and Digital Pre-Distortion (DPD) functionality. When used with industry standard Doherty amplifiers the Digital Pre- distortion solution provides up to 30dB of ACLR correction with PA output efficiencies exceeding 40%, allowing flexible and efficient RRH designs. The solution is fully customizable, with end applications including WCDMA, LTE, WiMAX, and DVB-T/S/H.
The RRH solution is supported by a development and test environment that includes GUI-based design simulation, performance analysis and a production test API with design examples.

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