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SDMA

SDMA Technology
Spatial Division Multiple Access enables simultaneous downlink communications with multiple users over the same frequency channel, thus increasing significantly the network capacity.

This unique SDMA technology creates two downlinks to two different users simultaneously, transmitting one data stream per user. Each stream is "beamed" by means of Beamforming in such a way that the user receives only the stream directed to him, while the other streams are received below the noise level. This doubles the network’s downlink capacity

Works with any standard based Wi-Fi client, keeping capacity increase completely independent of the Wi-Fi client type or model.

SDMA is effective when the following conditions are met:

• Clients are connected in good SNR (above 15dB), thus enabling high modulation rates.

• The environment is reflection-rich, thus enabling enough spatial diversity even for close angularly separated clients.

• A large number of clients are connected to the base station, thus enabling the variety between the clients needed for optimal pair selection.

• The backhaul to the base station is wide, thus not limiting the total downlink traffic.

SDMA technology is ideal for Internet Access in dense urban areas, such as public squares or train stations, where many clients are located in reflection-rich environment and most of them are located in good SNRs.

Another application for SDMA is Wireless Backhaul. A typical scenario includes 5.8GHz-Sector base station providing backhaul to multiple 2.4GHz units, using multiple 5.8GHz CPEs which are physically connected to the 2.4 GHz units

Beamforming SDMA Interference Handling Rate Adaptation ACS DTA HGDP