NDLI: Joint phase tracking and channel decoding for OFDM PNC: algorithm and experimental evaluation

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Joint phase tracking and channel decoding for OFDM PNC: algorithm and experimental evaluation

Joint phase tracking and channel decoding for OFDM PNC: algorithm and experimental evaluation

Content Provider	ACM Digital Library
Author	Wang, Taotao You, Lizhao Liew, Soung Chang
Abstract	This paper investigates the problem of joint phase tracking and channel decoding in OFDM based Physical-layer Network Coding (PNC) systems. OFDM signaling can obviate the need for tight time synchronization among multiple simultaneous transmissions in the uplink of PNC systems. However, OFDM PNC systems are susceptible to phase drifts caused by residual carrier frequency offsets (CFOs). In the traditional OFDM system in which a receiver receives from only one transmitter, pilot tones are employed to aid phase tracking. In OFDM PNC systems, multiple transmitters transmit to a receiver, and these pilot tones are shared among the multiple transmitters. This reduces the number of pilots that can be used by each transmitting node. Phase tracking in OFDM PNC is more challenging as a result. To overcome the degradation due to the reduced number of per-node pilots, this work supplements the pilots with the channel information contained in the data. In particular, we propose to solve the problems of phase tracking and channel decoding jointly. Our solution consists of the use of the expectation-maximization (EM) algorithm for phase tracking and the use of the belief propagation (BP) algorithm for channel decoding. The two problems are solved jointly through iterative processing between the EM and BP algorithms. Simulations and real experiments based on software-defined radio (SDR) show that the proposed method can improve phase tracking as well as channel decoding performance.
Starting Page	69
Ending Page	76
Page Count	8
File Format	PDF
ISBN	9781450329958
DOI	10.1145/2627788.2627792
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2014-08-18
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Sdr experimentation Expectation-maximization Ofdm Physical-layer network coding Phase tracking Belief propagation
Content Type	Text
Resource Type	Article

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