|Design Example \ Outside Design Store|
| Implementing OFDM Modulation and Demodulation|
|Cyclic prefix insertion is commonly used in orthogonal frequency division multiplexing (OFDM) systems as a way to mitigate the effects of intersymbol-interference (ISI). It copies the end section of an inverse fast Fourier transform (IFFT) packet to the beginning of an OFDM symbol. Usually the length of the cyclic prefix is longer than the length of the dispersive channel to completely remove ISI. OFDM modulation therefore mostly revolves around cyclic prefix: OFDM modulation includes IFFT operation and cyclic prefix insertion; OFDM demodulation includes cyclic prefix removal and FFT operation.|
Modern communications systems feature highly dynamic scalability, which often requires changing system parameters on-the-fly based on channel conditions and user quality of service (QoS) requirements. This design example demonstrates cyclic prefix insertion and removal for a reconfigurable OFDM system using the Altera® FFT MegaCore® function. It supports run-time reconfiguration of FFT size and cyclic prefix size.
| 32/64-bit PCI-X bus Master/Target interface Core, 66/100/133Mhz||Other |
| 1 Gigabit Ethernet MAC||Other |
|Non kit specific Stratix V Design Examples|
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