By Lawrence Rigby, Altera CorporationMarch 13, 2007 -- dspdesignline.com
WiMAX is fast gaining traction in the competitive world of broadband wireless access technology with many analysts acknowledging that it has significant market potential.
Scalable orthogonal frequency-division multiple access (OFDMA) is a key technology behind mobile WiMAX—as it is with other wireless technologies. OFDMA is also expected to play a key role 3GPP and 3GPP2 long term evolution standards.
To achieve competitive systems, however, designers and OEMs must choose a silicon platform that offers flexibility, scalability and a risk-free cost-reduction path. This is particularly true of an OFDMA engine because of its high performance requirements.
The scalable OFDMA engine should possess the following features:
- Support for 128, 512, 1K, and 2K FFT sizes to address variable bandwidths from 1.25 to 20 MHz
- Support for both downlink partial usage of subchannels (PUSC) and full usage of subchannels (FUSC) and uplink PUSC mandatory schemes
- Support for both fixed and variable pilots and runtime configurable cyclic prefix insertion
- Highly parameterizable design
- Optimized for efficient use of FPGA device resources
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