TURBO-DECO-X2-UT3 Lattice

TM ispLever CORECORE Turbo Decoder Users Guide November 2008 ipug14 04.4 Lattice Semiconductor Turbo Decoder Users Guide Introduction Lattices Turbo Decoder core provides an ideal solution that meets the needs of turbo decoding applications. The core provides a customizable solution allowing turbo decoding of data in many system designs. This core allows designers to focus on the application rather than the Turbo Decoder, resulting in a faster time to market. Turbo coding is an advanced error correction technique widely used in the communications industry. The Turbo Decoder IP Core from Lattice is compliant with three different standards: 3GPP, 3GPP2 and CCSDS. Lattices Turbo Decoder core was developed in conjunction with Lattices Turbo Encoder core to provide a complete solution. This Users Guide explains the functionality of the Turbo Decoder core and how it can be implemented to provide decoding. The Turbo Decoder core comes with the documentation and les listed below: Lattice gate level netlist RTL simulation model Core instantiation template Features Fully compatible with Third Generation Partnership Project (3GPP) standard: 3GPP TS 25.212 version 4.2.0 Fully compatible with CDMA2000/3GPP2 3GPP2 C.S002-C, May 2002 Fully compatible with Consultative Committee for Space Data Systems standard: CCSDS 101.0-B-5 Throughput of 2Mbps for 3GPP at 30MHz, 7 iterations, 6-bit input symbol width Twos complement data/parity input Depuncturing supported Variable soft-widths for input symbols User-dened number of states Variable block sizes during runtime Programmable number of iterations (1-15) Optional hard decision storage Selectable Max-Log-Map or Log-Map algorithm Optional external memory with programmable pipeline stages Optional double buffering -6 Bit Error Rate of 10 (at 1.5 dB Eb/No SNR) General Description Turbo coding is an advanced error correction technique widely used in the communications industry. Turbo encod- ers and decoders are key elements in todays communication systems to achieve the best possible data reception with fewest possible errors. The basis of turbo coding is to introduce redundancy in the data to be transmitted through a channel. The redundant data helps to recover original data from the received data. In data transmission, turbo coding helps achieve near Shannon limit performance. 2