A comparison of forward-only and bi-directional fixed-lag adaptive SISOs

Several structures for fixed-lag (FL) soft-in/soft-out (SISO) algorithms in the case of a perfectly known channel are well-known. These forward-only and bi-directional fixed-lag SISOs have been described with the bi-directional version shown to be preferred. Adaptive iterative detection using adaptive SISOs (A-SISOs) have also been demonstrated to provide significant performance gains for time-varying channels. However, these impressive results have been obtained with fixed-interval, bi-directional A-SISOs and training signals at both ends of the data packet. We combine these results to develop and compare various adaptive, fixed-lag SISOs. Among several reasonable options considered, the preferred A-SISO algorithm is found to be bi-directional with forward-only channel estimation.

[1]  R. Clarke.  A statistical theory of mobile-radio reception , 1968 .

[2]  Achilleas Anastasopoulos,et al.  TCM for frequency-selective, interleaved fading channels using joint diversity combining , 1998, ICC '98. 1998 IEEE International Conference on Communications. Conference Record. Affiliated with SUPERCOMM'98 (Cat. No.98CH36220).

[3]  Riccardo Raheli,et al.  Per-Survivor Processing: a general approach to MLSE in uncertain environments , 1995, IEEE Trans. Commun..

[4]  Riccardo Raheli,et al.  The principle of per-survivor processing: a general approach to approximate and adaptive MLSE , 1991, IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record.

[5]  Achilleas Anastasopoulos,et al.  A comparison between the sum-product and the min-sum iterative detection algorithms based on density evolution , 2001, GLOBECOM'01. IEEE Global Telecommunications Conference (Cat. No.01CH37270).

[6]  Achilleas Anastasopoulos,et al.  Adaptive iterative detection for turbo codes with carrier-phase uncertainty , 1999, Seamless Interconnection for Universal Services. Global Telecommunications Conference. GLOBECOM'99. (Cat. No.99CH37042).

[7]  Achilleas Anastasopoulos,et al.  Soft-decisions per-survivor processing for mobile fading channels , 1997, 1997 IEEE 47th Vehicular Technology Conference. Technology in Motion.

[8]  S Hancocks,et al.  I go to a friend , 2001, British dental journal.

[9]  Achilleas Anastasopoulos,et al.  Analysis of joint iterative decoding and phase estimation for the noncoherent AWGN channel, using density evolution , 2002, Proceedings IEEE International Symposium on Information Theory,.

[10]  A. Anastasopoulos,et al.  Adaptive SISO algorithms for iterative detection with parametric uncertainty , 1999, 1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352).

[11]  Achilleas Anastasopoulos,et al.  Integrated-layer packet radio study for AHS , 1995, Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications.

[12]  Achilleas Anastasopoulos,et al.  Adaptive soft-input soft-output algorithms for iterative detection with parametric uncertainty , 2000, IEEE Trans. Commun..

[13]  K. Abend,et al.  Statistical detection for communication channels with intersymbol interference , 1970 .

[14]  Achilleas Anastasopoulos,et al.  Iterative Detection: Adaptivity, Complexity Reduction, and Applications , 2000 .

[15]  Achilleas Anastasopoulos,et al.  Performance analysis of LDPC codes for time-selective complex fading channels , 2002, Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE.

[16]  Achilleas Anastasopoulos,et al.  Analysis and design of pilot-symbol-assisted codes, for the noncoherent AWGN channel, using density evolution , 2002, 2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333).

[17]  Achilleas Anastasopoulos,et al.  Design and robustness analysis of rotationally invariant SCTCM , 2001, ICC 2001. IEEE International Conference on Communications. Conference Record (Cat. No.01CH37240).

[18]  Achilleas Anastasopoulos,et al.  On symbol error probability bounds for ISI-like channels , 2001, IEEE Trans. Commun..

[19]  Achilleas Anastasopoulos.  Correct-decision-feedback performance bounds for joint detection and estimation , 2002, Proceedings IEEE International Symposium on Information Theory,.

[20]  Andreas Polydoros,et al.  MLSE for an unknown channel. II. Tracking performance , 1996, IEEE Trans. Commun..

[21]  Dariush Divsalar,et al.  Soft-input soft-output modules for the construction and distributed iterative decoding of code networks , 1998, Eur. Trans. Telecommun..

[22]  L. Lee.  Real-Time Minimal-Bit-Error Probability Decoding of Convolutional Codes , 1974, IEEE Trans. Commun..

[23]  Achilleas Anastasopoulos,et al.  An efficient method for simulation of frequency selective isotropic Rayleigh fading , 1997, 1997 IEEE 47th Vehicular Technology Conference. Technology in Motion.

[24]  Achilleas Anastasopoulos,et al.  Likelihood ratio tests for modulation classification , 2000, MILCOM 2000 Proceedings. 21st Century Military Communications. Architectures and Technologies for Information Superiority (Cat. No.00CH37155).

[25]  Achilleas Anastasopoulos,et al.  Adaptive soft-decision algorithms for mobile fading channels , 1998, Eur. Trans. Telecommun..

[26]  Achilleas Anastasopoulos,et al.  Polynomial-complexity, adaptive symbol-by-symbol soft-decision algorithms with application to non-coherent detection of LDPCC , 2002, 2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333).

[27]  Andreas Polydoros,et al.  Communication Technologies for AHS , 1997 .

[28]  Yoichi Sato,et al.  Optimum soft-output detection for channels with intersymbol interference , 1995, IEEE Trans. Inf. Theory.

[29]  Keith M. Chugg,et al.  Efficient architectures for soft-output algorithms , 1998, ICC '98. 1998 IEEE International Conference on Communications. Conference Record. Affiliated with SUPERCOMM'98 (Cat. No.98CH36220).

[30]  K.M. Chugg,et al.  Iterative equalization/decoding of TCM for frequency-selective fading channels , 1997, Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136).