GEO-Mobile Radio (GMR) is an ETSI standard for satellite phones. The Creonic GMR Decoder IP core supports the PNB2 burst packets that were added in GMR Release 2 (GMPRS-1) and use LDPC codes for the first time. The same burst modes and LDPC codes are also in GMR Release 3 (GMR-3G).
Further Low-throughput Applications
Standard Features the Core Supports
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).
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 (Xilinx, Altera).
Deliverable includes VHDL source code or synthesized netlist, VHDL or SystemC testbench, and bit-accurate Matlab, C or C++ simulation model.
The software model includes the corresponding transmitter part.