Figure 24:
Smart beamforming
Smart antenna key advantages
âš«
Eliminate Uplink Interference: Smart Beamforming delivers dramatic performance improvements
when dealing with strong co-channel uplink interference, maximizing network performance.
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Consistent Performance in High Interference: By mitigating significant sources of interference,
packet loss and retransmissions are kept to a minimum, keeping your network applications
working at their best.
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Improvement in Uplink and Downlink Performance: By eliminating packet loss and retransmissions
resulting from co-channel uplink interference, TCP retransmissions are greatly reduced. Other
applications also show significant performance benefits.
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Intelligent Filtering improves both receive and transmit performance. It protects the network from
off-channel interferers with a filter that dynamically moves around the channel. On the transmit
side, it protects the RF environment by reducing off-channel transmission noise.
Time-division duplexing
TDD cycle
ePMP links operate using Time Division Duplexing (TDD). The links employ a TDD cycle in which the AP
determines which Subscriber Modules may transmit and when based on the configured downlink/uplink
ratio (duty cycle). Three fixed Downlink/Uplink frame ratios are available
–
75/25, 50/50, and 30/70.
OFDM and channel bandwidth
ePMP 3000 transmits using Orthogonal Frequency Division Multiplexing (OFDM). This wideband signal
consists of many equally spaced sub-carriers. Although each subcarrier is modulated at a low rate using
conventional modulation schemes, the resultant data rate from all the sub-carriers is high.
The channel bandwidth of the OFDM signal is 20 MHz, 40 MHz, or 80 MHz, based on operator
configuration.
Each channel is offset in center frequency from its neighboring channel by 5 MHz.
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