GEO-Mobile Radio (GMR) LDPC Decoder

Overview

Key Features

• Compliant with GMR Release 2, ETSI TS 101 376-5-3 V2.3.1 (2008-07) (GMPRS-1 05.003)
• Compliant with GMR Release 3, ETSI TS 101 376-5-3 V3.1.1 (2009-07) (GMR-3G 45.003)
• Support for return and forward link.
• Support for short PNB2 (5,3) bursts and long PNB2 (5,12) bursts
• Support for all PNB2 modulation schemes (Pi/4-QPSK, 16-APSK, 32-APSK)
• Support for all PNB2 shortening, repeating, and puncturing schemes.
• Support for all PNB2 LDPC codes (approximate channel coding rates 1/2, 2/3, 4/5, 9/10)

Benefits

• FPGA-proven design, validated with satellite data
• Soft-decision demapper, LLR-descrambler, block deinterleaver, and LDPC decoder included
• Low-power and low-complexity design.
• Burst-to-burst on-the-fly configuration.
• Design-time configuration of throughput for optimal resource utilization
• Faster convergence due to layered LDPC decoder architecture
• Early stopping criterion for iterative LDPC decoder, saving a considerable amount of energy
• Configurable amount of LDPC decoding iterations for trading-off throughput and error correction performance
• Collection of statistic information (number of modified information bits, number of iterations, decoding successful)
• Available for ASIC and FPGAs (AMD Xilinx, Intel)
• Deliverable includes VHDL source code or synthesized netlist, VHDL testbench, and bit-accurate Matlab, C or C++ simulation model
• The software model includes the corresponding transmitter part

Applications

• Satellite Telephony
• Further Low-throughput Applications

Deliverables

• VHDL source code or synthesized netlist
• HDL simulation models e.g. for Aldec’s Riviera-PRO
• VHDL testbench
• bit-accurate Matlab, C or C++ simulation model
• comprehensive documentation

Technical Specifications