LTE eNB Reference design is a fully integrated solution for small cell and macro cell deployments. As part of the reference design both PHY and HLS (L2 & L3) are realized completely as a software solution. The solution delivers multi Antenna MIMO system, compliant to 3GPP release 10, supporting all useful features. The solution is qualified against industry’s leading test equipment and multiple UEs based on different chip-set vendors.

LTE eNB reference design is adopted by OEMs to develop military communication network. At Lekha, there is vast experience of supporting customers for field trials, productization and manufacturing activities.


Brief About eNB Reference Design

PHY Stack : PHY is developed using highly optimized library functions for C66x specific architecture. The solution includes a platform independent C code for reference and matlab scripts for several algorithms.

HLS Stack: HLS is organized as time critical and asynchronous functions. The design is flexible to partition the entire processing across a pure multi core embedded processor or combination of embedded and DSP cores.  L2L1 interface follows the FAPI protocol. Physical interface for L2L1 interface protocol can be on chip shared memory or 10G Ethernet port.The solution includes independent test frame work and a development environment to customize the RRM scheduler.

Diagnostics and Debugging:

Remote logging with multiple hierarchial and module-wise log levels available. Logging mechanism is built so that it does not affect real-time operations. Simple and interactive CLI is supported for changing parameters and obtaining statistics.

Configuration and Monitoring:

The reference solution includes an interactive configuration tool with which User can manage all standard configurations. There is also an integrated GUI to manage multiple eNBs, configure them and disaplay logs from each of them. eNB reference design supports SNMPv3 to integrate with NMS tool to enable monitoring and configuration management.



  • 3GPP Release 10 compliant (Supports  2 x 20 MHz carrier aggregation)
  • 4 users per TTI are scheduled
  • Upto 128 active users supported
  • Upto 4×4 MIMO, 4 Tx and 4 Rx
  • 5,10 and 20 MHz bandwidth support
  • TDD/FDD modes are supported
  • All 3GPP RF bands are supported.


Evolved Packet Core Options :

The eNB reference design is tested with both open source and third party commercial EPC solutions. The eNB solution can be integrated to any standard EPC with minimum effort.

Radio Options: Lekha’s eNB supports below radio interface options.

  • Integration of a JESD based radio on K2L device using IQNet interface.
  • Integration of an embedded Radio using SRIO communication.
  • Support for developing/ Customizing the driver for CPRI interface for integrating COTS Remote Radio Head (RRH).


Lekha’s LTE eNB uses COTS HW reference platform described below for Small Cell Application using TCI6630 SoC. The solution is also integrated on Lekha’s Jupiter platform which uses TI’s TCI 6638 SoC.

Lekha’s L2L3 stack is optimized for real time operation on x86 and ARM multicore platforms. It also can operate in PC based environment for non realtime MAC-MAC testing with any UE stack.

Lekha has several RTL IP components that realize LTE functionalities on FPGA. These IPs can be used for easy migration of the eNB stack to a non Keystone II based HW architecture. The eNB reference design is completely software defined is a good starting point for realizing pre-5G Back Haul and Front Haul solution.

TCI6630K2L EVM for Base Band Processing

The TCIEVMK2LX Evaluation Module (EVM) is a high performance, cost-efficient, standalone development platform that enables users to evaluate and develop applications for the TI’s Keystone II SoC. The TCIEVMK2LX Evaluation Module (EVM) also serves as a hardware reference design platform for the TCI6630K2L SoC. The SoC has TI’s Four C66x DSP Cores + Two ARM Cortex A15 Cores.


AFE7500 EVM as Radio Front End

The AFE7500 Evaluation Module, abbreviated as AFE7500-EVM, is a board designed for the evaluation of the Integrated Transceiver AFE7500 from Texas Instruments Inc. The AFE7500-EVM incorporates all required circuitry and components with the following features.

  1. Zero-IF transceiver (2T+2R RF-to-Bits Conversion)
  2. 40 MHz RF traffic bandwidth
  3. Supports all 3GPP Bands (Rel. 9 &10)
  4. Integrated Feed Back Receiver Path
    • Feedback for external Digital Pre Distortion(DPD)
    • 5x Expansion Bandwidth
    • Independent Network Listening Mode
  5. JESD204B Interface with Multi-Rate SerDes