2013 Proc. Asilomar Conference on Signals, Systems and Computers

FPGA Implementation of a Message-Passing OFDM Receivers for Impulsive Noise Channels

Karl Nieman (1), Marcel Nassar (2), Jing Lin (1) and Brian L. Evans (1)

(1) Department of Electrical and Computer Engineering, Wireless Networking and Communications Group, The University of Texas at Austin, Austin, TX 78712 USA
karl.nieman@utexas.edu - jing.lin08@gmail.com - bevans@ece.utexas.edu

(2) Mobile Solutions Lab, Samsung Information Systems America, San Diego, CA USA
mnassar@utexas.edu

Paper - Slides - Poster - Software Release

Paper Won Best Student Paper Award for the Architecture and Implementation Track and Placed Second for the Overall Student Best Paper Award for the Conference

Smart Grid Communications Research at UT Austin

Abstract

Conventional orthogonal frequency division multiplexing (OFDM) communication systems are typically designed assuming additive white Gaussian noise and interference statistics. However, in many applications, such as Wi-Fi and powerline communications (PLC), impulsive statistics are often observed. Impulsive noise can degrade the signal-to-noise ratio (SNR) of all subcarriers and impair communication performance. In this work, we design and implement a real-time OFDM receiver with approximate message passing (AMP) to estimate and mitigate impulsive noise. The goal is to meet throughput and latency requirements while guaranteeing improved communication performance in impulsive noise. Our contributions include

modeling functional parallelism in an AMP OFDM receiver in synchronous dataflow,
converting an AMP OFDM PLC receiver to using only fixed-point data and arithmetic, and
mapping the receiver in fixed-point onto a Field Programmable Gate Array (FPGA) target using a high-level graphical synthesis tool.

Our FPGA OFDM transceiver testbed achieves full streaming throughput at G3-PLC rates and recovers up to 8 dB SNR of impulsive noise over a wide SNR range.

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Last Updated 01/04/14.