LDPC IP for 3GPP 5G NR | AccelerComm Channel Coding Experts

3GPP compliant encoding & decoding chain

Rob Maunder, CTO - LDPC channel code for 5G new radio

Our LDPC encoding and decoding IP for the 3GPP New Radio uplink and downlink data channel includes the entire processing chain, to provide quick and easy integration and minimize the amount of extra work needed.

The LDPC core uses novel layer belief propagation schedules with early termination, in order to achieve compromise-free error correction performance with high hardware efficiency.

The diagrams below shows the various functions performed by the AccelerComm IP for Layer 1 (Physical Layer) of NR radio interface. The focus is on data channels coding with the first diagram showing blocks for LDPC encoding of physical shared channels (PDSCH/PUSCH) referred to by AccelerComm product number LD550 and LE550. The second diagram represents the LDPC decoding blocks for the same physical shared channels on the receive side. All products include Transport Block processing and HARQ management in hardware.

Features

Fully compliant with the 3GPP NR standard for PDSCH, PUSCH. Supports the full range of uncoded and encoded block sizes
Implements the entire LDPC encoding and decoding chain in 3GPP TS38.212
High error correction performance from LDPC decoder core
Tightly integrates the components in the chain to reduce area usage and latency
Simple interface, quick to integrate – all parameters are internally calculated

FPGA support for Xilinx, Intel and Achronix
Optimized for ASIC process
Optimized software solution on Intel Architecture and AVX512 acceleration
Matlab and C Models available
Configurable parameters for power & performance optimization
Scalable design
Standard AXI interfaces

Functional specifics

Encoder	Decoder
Transport Block CRC encoding	Transport Block CRC decoding
Code block segmentation	Code block de-segmentation
CRC encoding	CRC decoding
LDPC encoding (basegraph 1 and 2, all Z-values)	LDPC decoding (basegraph 1 and 2, all Z-values)
Rate matching (incl. repetition)	HARQ combining
Bit-level interleaver	Filler bits insertion/removal
Filler bits insertion/removal	Inverse Rate matching (incl. repetition)
Code block concatenation	Bit-level de-interleaver
	Soft-output interface (optional)
	Re-encoded output stream (optional)
	Code block de-concatenation

Applications

The LDPC encoding and decoding chains are the building blocks that furthers usage in a variety of applications. Our flexible IP can be used in a wide range of applications ranging from ASICs for dedicated implementations through lookaside accelerators for cloud RAN and software implementations.

Lookaside Hardware Acceleration

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Software Acceleration for FlexRan

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SD-FEC Compliant Chain

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Product Codes

Code	Description	Delivery Type
LD350	A pre & post processing wrapper that completes the 5G NR 3GPP compliant chain when using a Xilinx SD-FEC LDPC Decoder Core.	FPGA Netlist (Xilinx Only)
LE350	A pre & post processing wrapper that completes the 5G NR 3GPP compliant chain when using a Xilinx SD-FEC LDPC Encoder Core.	FPGA Netlist (Xilinx Only)
LD500	LDPC Decode core only with optimized algorithms for ultimate BLER performance ideal for Satellite applications.	Encrypted RTL or FPGA Netlist
LE500	LDPC Encode core only optimized for performance and low power ideal for Satellite applications.	Encrypted RTL or FPGA Netlist
LD550	Complete LDPC Decode 5G NR 3GPP chain. See LDPC decoder chain diagram	Encrypted RTL or FPGA Netlist
LE550	Complete LDPC Encode 5G NR 3GPP chain. See LDPC encoder chain diagram	Encrypted RTL or FPGA Netlist
LD600	Optimized decoder core only for Intel Architecture (IA) and AVX512 co-processor.	Software binary for IA
LD850	To enable higher throughput and reduce CPU load. Transport block processing can be added with deconcatenation and TB CRC.	Encrypted RTL or FPGA Netlist
LE850	To enable higher throughput and reduce CPU load. Transport block processing can be added with concatenation and segmentation.	Encrypted RTL or FPGA Netlist
T2 L1 Acceleration	A Complete L1 acceleration system using ORAN API’s to offload LDPC processing from L1 stack. Simple integration and high performance (e.g. 16Gbps decode with PCI Gen3 x 16).	Encypted Netlist & Software installer for ORAN api (server side)

Technical resources

Our technical resources are freely available for anyone to download. Research and innovation form an integral part of our business and we want to share this with you.

Datasheets

Detailed specification sheets for our LDPC product, including block diagrams, performance graphs and comparison tables.

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Whitepapers

Research, technical leadership and tutorial papers from our CTO on the latest factors influencing the future of LDPC standards.

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Software

Open source software models and evaluation code for encoder and decoder simulations for our LDPC product.

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5G NR LDPC Product Overview

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