WiMAX OFDM

"This reference design has been developed to support OFDM in FDD, TDD or HD_FDD modes for use in implementing the physical interface (PHY) in base station applications for point-to-point and point-to-multipoint connections.

Features
Nominal 10MHz channel bandwidth
Sampling factor n = 8/7
Sampling frequency Fs = 11.424MHz
Sub-carrier spacing (?f = 44.625KHz
Useful symbol time Tb = 1/(?f = 22.40µs
Sampling time Tb/ NFFT = 87.535ns
256 point FFT (NFFT = 256)
Frequency and timing estimation using Schmidl and Cox algorithm
Handles offsets of up to 13% (equivalent to 50km/h at BW=1.75)
Channel estimation using preamble and carrier phase tracking using preamble and pilots
Nominal 23MHz (low-IF) input sampling rate (2* Fs)
Real only ADC input with digital down-conversion to baseband.
Zero-IF complex (I and Q) outputs to DACs
Mandatory Reed-Solomon (RS) and Convolutional encoding and RS and Viterbi decoding
BPSK,QPSK, 16-QAM and 64-QAM modulation/de-modulation
Cyclic prefix length 1/4,1/8,1/16,1/32
32 bit Wishbone bus interface for data and control: single slave interface"