Analog Joint Source-Channel Coding for OFDM systems

Oscar Fresnedo, Francisco J. Vazquez-Araujo, Luis Castedo, Javier Garcia-Frias
2013 2013 IEEE 14th Workshop on Signal Processing Advances in Wireless Communications (SPAWC)  
Recently, analog Joint Source-Channel Coding (JSCC) has been shown to approach the optimal distortion-cost trade-off when transmitting over AWGN channels. In this work we consider analog JSCC over frequency-selective channels using Orthogonal Frequency Division Multiplexing (OFDM) modulation. Due to its high complexity, optimal MMSE analog JSCC decoding is infeasible in OFDM, hence a practical two-stage decoding approach made up of a MMSE estimator followed by a Maximum Likelihood (ML) decoder
more » ... s proposed. Three different alternatives for system optimization are considered: non-adaptive coding, adaptive coding, and adaptive coding with precoding. We show that the three analog JSCC transmission strategies approach the optimal distortion-cost trade-off although much better performance is obtained with the adaptive coding with precoding method, specially in Multiple Input Multiple Output (MIMO) OFDM systems. Recent work in analog JSCC [3]-[5] , [8] proposes the use of analog mappings based on geometric curves. An example 978-1-4673-5577-3/13/$31.00 ©2013 IEEE
doi:10.1109/spawc.2013.6612141 dblp:conf/spawc/FresnedoVCG13 fatcat:rgxeq3r53baflmkpijeavitile