LDPC_feature

LDPC Feature

Feature(特性)

AXI-stream interface(refer to AXI spec)

支持单独译码器(decoder only)

支持单独编码器(encoder only)

LLR位宽可以灵活配置

(可选)支持基于NR标准的速率匹配 TX (NR rate-matching)

(可选)支持基于NR标准的解速率匹配 RX (NR de-rate-matching)

(可选)支持基于NR标准的HARQ合并 (NR HARQ combine)

(可选)NR LDPC CBGTI (refer to spec)

Deliverable(交付件)

Verilog/VHDL code or netlist

HDL model and testbench

C/C++ bit accurate model

Matlab bit accurate model (via mex interface)

Python bit accurate model (via CPython interface)

Document (PDF format)

Reference

Creonic LDPC full decoder chain 在Xilinx中的资源消耗对照

Xilinx 7z045 / 112,731 LUTs / 103,946 FFs / BRAMs(18k/36k) (13/351) / DSP48E 0 / Freq 150MHz (Xilinx 7z020是Xilinx 7z045的大约1/4)

LDPC decoder Throughput: 574M bit/s

performance:

BLER 1e-4 for BG-1 Es/N0 = 6.24dB (QPSK, k = 8448, R = 22/27) BLER 1e-4 for BG-1 Es/N0 = -0.34dB (QPSK, k = 8448, R = 22/68)

BLER 1e-4 for BG-2 Es/N0 = 3.49dB (QPSK, k = 3840, R = 10/17) BLER 1e-4 for BG-2 Es/N0 = -3.00dB (QPSK, k = 3840, R = 10/52)

default bit width 6-bits

Functional specifications (encoder):

  • CRC encoding
  • Filler bits insertion/removal
  • LDPC encoding (basegraph1 and 2, all Z-values)
  • Rate matching (incl. repetition)
  • Bit-level interleaver
  • Support of WiFi (optional)
  • Transport Block level processing (optional)

Functional specifications (decoder):

  • Bit-level de-interleaver
  • HARQ combining
  • Inverse Rate matching (incl. repetition)
  • Filler bits insertion/removal
  • LDPC decoding (basegraph1 and 2, all Z-values)
  • CRC decoding
  • Soft-output interface (optional)
  • Support of WiFi (optional)
  • Reencoded output stream (optional)
  • Transport Block level processing (optional)

Core features:

  • Fully validated Cores (comprehensive factory tests, independant verifications)
  • Advanced HARQ combining / stream compression
  • Versatile Decoding algorithm profiles
  • Scalable throughput design
  • Very high clock frequency achieved on ASIC process
  • Multi-Gigabit range throughput
  • Scalable design (three throughput profiles)
  • AXI4-stream interfaces
  • Frame-by-frame on-the-fly configuration
  • Comprehensive monitoring information (syndrome check, SNR indicator,…)
  • Efficient iteration-stopping feature