Graph-Based Soft Channel Estimation for Fast Fading Channels

In this paper, a graph-based soft iterative receiver (GSIR) for fast fading channels is investigated. Soft channel estimation as well as soft-output data detection are jointly accomplished via Bayesian inference over a general factor graph. The key feature is a transfer node which enables information flow from one channel node to adjacent channel nodes. The performance characteristics of this receiver is investigated via an EXIT chart analysis and simulation results. Particular emphasis is on a proper channel code design. The algorithm is universally applicable to arbitrary (bijective and non-bijective) modulation formats and can easily be extended to multi-dimensional channel estimation.

[1]  Brian L. Hughes,et al.  Joint channel estimation and data detection in space-time communications , 2003, IEEE Trans. Commun..

[2]  Andrew C. Singer,et al.  Soft input channel estimation for turbo equalization , 2004, IEEE Transactions on Signal Processing.

[3]  Wayne E. Stark,et al.  Unified design of iterative receivers using factor graphs , 2001, IEEE Trans. Inf. Theory.

[4]  Peter Adam Hoeher,et al.  A universal coding approach for superposition mapping , 2010, 2010 6th International Symposium on Turbo Codes & Iterative Information Processing.

[5]  Peter Adam Hoeher,et al.  A statistical discrete-time model for the WSSUS multipath channel , 1992 .

[6]  Stephan ten Brink,et al.  Convergence behavior of iteratively decoded parallel concatenated codes , 2001, IEEE Trans. Commun..

[7]  Michael L. Honig,et al.  Joint Channel Estimation and Co-Channel Interference Mitigation in Wireless Networks Using Belief Propagation , 2008, 2008 IEEE International Conference on Communications.

[8]  Peter A. Hoeher,et al.  Iterative Pilot-Layer Aided Channel Estimation with Emphasis on Interleave-Division Multiple Access Systems , 2006, EURASIP J. Adv. Signal Process..

[9]  Ralf R. Müller,et al.  Joint Twofold-Iterative Channel Estimation and Multiuser Detection for MIMO-OFDM Systems , 2008, IEEE Transactions on Wireless Communications.

[10]  Evaggelos Geraniotis,et al.  Performance comparison of iteratively filtered and decoded MDD and PSAM systems with linear complexity , 1999, WCNC. 1999 IEEE Wireless Communications and Networking Conference (Cat. No.99TH8466).

[11]  Qinghua Li,et al.  An iterative receiver for turbo-coded pilot-assisted modulation in fading channels , 2001, IEEE Communications Letters.

[12]  X. Jin.  Factor graphs and the Sum-Product Algorithm , 2002 .

[13]  Peter Adam Hoeher.  TCM on Frequency-Selective Land-Mobile Fading Channels , 1991 .

[14]  J. Cavers.  An analysis of pilot symbol assisted modulation for Rayleigh fading channels (mobile radio) , 1991 .

[15]  Peter Adam Hoeher,et al.  Graph-Based Iterative Gaussian Detection with Soft Channel Estimation for MIMO Systems , 2011 .

[16]  Keigo Takeuchi,et al.  Iterative channel estimation, detection, and decoding in large CDMA systems , 2010, 2010 6th International Symposium on Turbo Codes & Iterative Information Processing.

[17]  Peter A. Hoeher,et al.  Graph-Based Soft Channel and Data Estimation for MIMO Systems with Asymmetric LDPC Codes , 2008, 2008 IEEE International Conference on Communications.

[18]  Matthew C. Valenti,et al.  Iterative channel estimation and decoding of pilot symbol assisted turbo codes over flat-fading channels , 2001, IEEE J. Sel. Areas Commun..

[19]  Peter A. Hoeher,et al.  Iterative Processing for Superposition Mapping , 2010, J. Electr. Comput. Eng..

[20]  Lars K. Rasmussen,et al.  A Divergence Minimization Approach to Joint Multiuser Decoding for Coded CDMA , 2008, IEEE Journal on Selected Areas in Communications.

[21]  Gunther Auer,et al.  2D Graph-Based Soft Channel Estimation for MIMO-OFDM , 2010, 2010 IEEE International Conference on Communications.

[22]  Gunther Auer,et al.  Multi-Dimensional Graph-Based Soft Iterative Receiver for MIMO-OFDM , 2012, IEEE Transactions on Communications.

[23]  Michael L. Honig,et al.  A message-passing approach for joint channel estimation, interference mitigation, and decoding , 2009, IEEE Transactions on Wireless Communications.

[24]  Patrick Robertson,et al.  Pilot-symbol-aided channel estimation in time and frequency , 1997 .

[25]  Umberto Spagnolini,et al.  Soft Iterative Channel Estimation With Subspace and Rank Tracking , 2007, IEEE Signal Processing Letters.