Hardware/software trade-offs for advanced 3G channel coding

Third generation's wireless communications systems comprise advanced signal processing algorithms that increase the computational requirements more than ten-fold over 2G's systems. Numerous existing and emerging standards require flexible implementations ("software radio"). Thus efficient implementations of the performance-critical parts as Turbo decoding on programmable architectures are of great interest. Besides high-performance DSPs, application-customized RISC cores offer the required performance while still maintaining the aspired flexibility. This paper presents for the first time Turbo decoder implementations on customized RISC cores and compares the results with implementations on state-of-the-art VLIW DSPs. The results of our studies show that the Log-MAP performance is about 50% higher that on an ST120, a current VLIW architecture.

[1]  A. Glavieux,et al.  Near Shannon limit error-correcting coding and decoding: Turbo-codes. 1 , 1993, Proceedings of ICC '93 - IEEE International Conference on Communications.

[2]  Ingrid Verbauwhede,et al.  Low power DSP's for wireless communications , 2000, ISLPED'00: Proceedings of the 2000 International Symposium on Low Power Electronics and Design (Cat. No.00TH8514).

[3]  Patrick Robertson,et al.  Optimal and sub-optimal maximum a posteriori algorithms suitable for turbo decoding , 1997, Eur. Trans. Telecommun..

[4]  Norbert Wehn,et al.  Turbo-decoder quantization for UMTS , 2001, IEEE Communications Letters.

[5]  Carlos Delgado Kloos,et al.  Proceedings 2002 Design, Automation and Test in Europe Conference and Exhibition , 2002, Proceedings 2002 Design, Automation and Test in Europe Conference and Exhibition.

[6]  Keshab K. Parhi,et al.  VLSI implementation issues of TURBO decoder design for wireless applications , 1999, 1999 IEEE Workshop on Signal Processing Systems. SiPS 99. Design and Implementation (Cat. No.99TH8461).

[7]  Gerhard Fettweis,et al.  Comparison of different turbo decoder realizations for IMT-2000 , 1999, Seamless Interconnection for Universal Services. Global Telecommunications Conference. GLOBECOM'99. (Cat. No.99CH37042).

[8]  Ran-Hong Yan,et al.  DSP systems for next-generation mobile wireless infrastructure , 2000, 2000 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.00CH37100).

[9]  Norbert Wehn,et al.  Advanced Implementation Issues of Turbo-Decoders , 2000 .

[10]  P. M. Chau,et al.  Reconfigurable signal processor for channel coding and decoding in low SNR wireless communications , 1998, 1998 IEEE Workshop on Signal Processing Systems. SIPS 98. Design and Implementation (Cat. No.98TH8374).