1536 FFT/IFFT Reference Design for 3GPP LTE

from Altera Corporation

Please contact your local Altera sales representative for a copy of this reference design. The use of this design is governed by, and subject to, the terms and conditions of the Altera Hardware Reference Design License Agreement.

Overview

You can use the Altera^® 1536 FFT/IFFT reference design to accelerate the implementation of 3rd generation partnership project (3GPP) long term evolution (LTE) based wireless networks. 1536 point FFT/IFFT is required at both the basestation and the terminal for the transmission and reception of a 15-MHz carrier. This reference design demonstrates the suitability of Stratix^®, Arria^®, and Cyclone^® series FPGAs for implementing high performance, low latency FFT/IFFT functionality.

Altera supplies the reference design as clear-text Verilog, including a MATLAB bit-accurate simulation model.

Features

• Streaming 1536-point FFT with natural input and output order
• Avalon^® Streaming (ST) compliant interfaces without backpressure
• Fixed point I/O representation to maintain precision
  • 16-bit-wide input data, 33-bit-wide output data
  • 16-bit-wide twiddle factor precision
• Transform direction (FFT/IFFT) specifiable on a per-block basis
• Verilog testbench and Tcl script provided for the ModelSim^® simulator
• Target clock rate:
  • 184.32 MHz for Stratix III devices
  • 122.88 MHz for Cyclone III devices

Demonstrated Altera Technology

Block Diagram

Figure 1 shows the 1536 FFT/IFFT reference design blocks.

Figure 1. 1536 FFT/IFFT Reference Design Blocks

Related Links

• AN 480: 1536 FFT/IFFT reference design for LTE (PDF)
• LTE Basestation Solutions

Reference Designs Disclaimer

These reference design illustrations may be used within Altera Corporation devices only and remain the copyrighted property of Altera. They are being provided on an "as-is" basis and as an accommodation, and therefore all warranties, representations, or guarantees of any kind (whether express, implied, or statutory) including, without limitation, warranties of merchantability, non-infringement, or fitness for a particular purpose, are specifically disclaimed. Altera expressly does not recommend, suggest, or require that these examples be used in combination with any other product not provided by Altera.