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802.11n Modem IP

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802.11n Modem IP

OFDM Modems are used in systems which are subjected to large frequency selective fading which results in inter symbol interference (ISI). By using a cyclic prefix (CP), OFDM system provides robustness against ISI. Further there is no need of complex adaptive equalizer as in single tone system. Hence, OFDM modem have found their place in most of the latest standards including Wi-Fi (802.11n, 802.11ac), Wi-Max (802.16e), DVB-S2, 3GPP-LTE Advanced.

  • Fully synchronous design using a single clock
  • 512 Point FFT to minimize Cyclic Prefix Overhead
  • Modulation scheme used is QPSK, QAM
  • Option for latest FEC codec such as LDPC/ Turbo Convolution Code (TCC)
  • Adaptive length of Cyclic Prefix (CP) to improve the band-width efficiency and take care of large delay spread.
  • Adaptive modulation depending upon the link quality
  • Traveling Pilots to improve the channel estimation in time varying channel
  • Carrier and Sampling frequency offset estimation and compensation up to 50 ppm
  • Very low (10-6) packet miss and false packet detection probability
  • Options of standard and burst preambles
  • Implementation Loss is minimized to 0.5 dB by using an innovative bit-width optimization scheme
  • Easy-to-use interface with handshaking signals
  • Supports all FPGA devices
  • Maximum synthesizable frequency is 100MHz to 200 MHZ depending on target FPGA

IP Data Fact Sheet

ParameterValue
ModulationQPSK, 16QAM, 64QAM
FEC SchemeRSC, LDPC, TCC
Code Rate1/2, 2/3, 3/4, 5/6, 7/8
No. of Data Carrier480, 348, 384
No. of Pilot Carrier32, 64, 128
Cyclic Prefix Length32, 64, 128

Provided with IP

DocumentsProduct Specification
Design FilesRTL-VHDL (Optional)
Reference DesignProvided
System Generator ModelProvided (Optional)
Matlab Bit-Accurate ModelProvided (Optional)

Design Tools

SimulationModelSim SE
Synthesis ToolXilinx ISE /Altera Quartus
Support
Three Month Support Provided

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