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Uplink desubchannelization for WiMAX

Posted: 05 Mar 2007 ?? ?Print Version ?Bookmark and Share

Keywords:WiMAX? OFDMA? Altera? access point? subscriber station?

In orthogonal frequency-division multiple access (OFDMA) systems, multiple end stations or subscriber stations (SSs) transmit at the same time to the access point (AP) or base station. The uplink bandwidth is split into different subchannels, where each subchannel occupies different frequencies in the available bandwidth. Each SS is allocated one or more subchannels to allocate their data on. Some subchannels are allocated for any SS to transmit on. These tend to be used for ranging (timing synchronization) between SS and AP. Hence on these subchannels there may be contention between different SSs.

At the AP, the received signal is downconverted, the cyclic prefix is removed and converted into the frequency domain using an FFT operation, and the signal is split up into its separate subchannelsdesubchannelization. The uplink desubchannelization reference design is for the AP on the uplink (receiver path). It accepts the frequency domain symbol data and extracts the different subchannels from it. It then outputs user data on one output interface and ranging data on a separate output interface.

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