doc.: IEEE /0243r1 Submission Franck Lebeugle, France Telecom R&D March 2004 Slide 1 Turbo Codes for IEEE n Marie-Helene Hamon, Vincent Le Nir, Marilyne Helard, Franck Lebeugle France Telecom R&D, Rennes, France (contact: March 2004

doc.: IEEE /0243r1 Submission Franck Lebeugle, France Telecom R&D March 2004 Slide 2 Contents TC for n Duo-Binary Turbo Codes Simulation assumptions Results Conclusion

doc.: IEEE /0243r1 Submission Franck Lebeugle, France Telecom R&D March 2004 Slide 3 Turbo Codes: Iterative FEC for n Powerful error correcting codes are considered in n discussions Turbo Codes, and more specifically Duo-Binary Turbo Codes [4], the latest generation of convolutional turbo codes, have been introduced in contribution IEEE /003 [1] at the last meeting The numerous advantages of these Turbo Codes, including the large performance gains enabled and their high flexibility, have been demonstrated in this previous contribution. This presentation will focus on the performance of these Turbo Codes in a PHY reference model.

doc.: IEEE /0243r1 Submission Franck Lebeugle, France Telecom R&D March 2004 Slide 4 Duo-Binary Turbo Codes Very good performance: better than LDPC codes - for any code rate - for any block size <10000 bits - for any BER > for any associated modulation Highly flexible solution: Duo-Binary Turbo Codes adjust easily to any code rate and block size, resulting in a better granularity

doc.: IEEE /0243r1 Submission Franck Lebeugle, France Telecom R&D March 2004 Slide 5 Simulation assumptions Simulation chain based on a PHY model Perfect channel estimation, synchronization and front end (SISO configuration) Channels - AWGN channel - BRAN A channel

doc.: IEEE /0243r1 Submission Franck Lebeugle, France Telecom R&D March 2004 Slide 6 Simulation Assumptions The turbo code and the a convolutional code both simulated, with packet size 200 bytes, code rates ½ and ¾ Turbo Codes - 8-state Duo-Binary Convolutional Turbo Codes - Max-Log-MAP decoding, 8 iterations Convolutional Code - Viterbi decoding algorithm

doc.: IEEE /0243r1 Submission Franck Lebeugle, France Telecom R&D March 2004 Slide 7 Simulation Results: AWGN 2 to 2.5 dB gain at PER 1%

doc.: IEEE /0243r1 Submission Franck Lebeugle, France Telecom R&D March 2004 Slide 8 Simulation Results: BRAN A 1.8 to 2.4 dB gain at PER 1%

doc.: IEEE /0243r1 Submission Franck Lebeugle, France Telecom R&D March 2004 Slide 9 Turbo Codes and MIMO MIMO techniques employed: Space-Time Block Coding (2x1) Alamouti scheme Channel model: uncorrelated Rayleigh fading channels

doc.: IEEE /0243r1 Submission Franck Lebeugle, France Telecom R&D March 2004 Slide 10 Simulation results: STBC 2x1

doc.: IEEE /0243r1 Submission Franck Lebeugle, France Telecom R&D March 2004 Slide 11 Conclusions Turbo Codes, and more specifically Duo-Binary Turbo Codes, provide large performance gains in a context, as well as combined with MIMO techniques Their flexibility is an important advantage, allowing a finer granularity in block size and coding rate (cf [1]) Incorporated in a complete system, these Turbo Codes will represent a significant advantage to achieve n goals.

doc.: IEEE /0243r1 Submission Franck Lebeugle, France Telecom R&D March 2004 Slide 12 References [1] IEEE /003, "Turbo Codes for n", France Telecom R&D, ENST Bretagne, iCoding Technology, TurboConcept, January [2] C. Berrou, A. Glavieux, P. Thitimajshima, "Near Shannon limit error- correcting coding and decoding: Turbo Codes", ICC93, vol. 2, pp , May 93. [3] C. Berrou, "The ten-year-old turbo codes are entering into service", IEEE Communications Magazine, vol. 41, pp , August 03. [4] C. Berrou, M. Jezequel, C. Douillard, S. Kerouedan, "The advantages of non- binary turbo codes", Proc IEEE ITW 2001, pp , Sept. 01. [5] TS : 3rd Generation Partnership Project (3GPP) ; Technical Specification Group (TSG) ; Radio Access Network (RAN) ; Working Group 1 (WG1); "Multiplexing and channel coding (FDD)". October [6] EN : Digital Video Broadcasting (DVB) "Interaction channel or satellite distribution systems". December [7] EN : Digital Video Broadcasting (DVB) "Specification of interaction channel for digital terrestrial TV including multiple access OFDM". March 2002.