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
(2) Mobile Solutions Lab, Samsung Information Systems America, San Diego, CA USA
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
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
The goal is to meet throughput and latency requirements while
guaranteeing improved communication performance in impulsive noise.
Our contributions include
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.
- 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.
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