Features of the PCMA Hub Canceller
- Works with Evolution® DVB-S2/ACM
- At Hub location as an add-on technology enhancer
- Supports any network or market, especially in capacity-constrained regions
- Works with all modulation types and FEC coding in C- or Ku-Band
Slash bandwidth costs and unleash the capacity of your satellite networks with the VPCMA-L Enhanced Hub Canceller from ViaSat. This frequency-reuse appliance harnesses the power of ViaSat’s patented Paired Carrier Multiple Access (PCMA) technology to cut satellite bandwidth needs by as much as fifty percent. By simply adding the appliance to your satellite network, you can expand the capacity of transponders, free up bandwidth for more applications, and lower your network’s operating costs. For example, while satellite space segment costs can vary greatly depending on location and usage, a network operator paying $4,000 per MHz per month for 54 MHz can save up to $907,200 a year on bandwidth by using the VPCMA-L. The VPCMA-L boosts the capacity of your satellite transponder space by combining the uplink and downlink transmissions into the same bandwidth. While most satellite transmissions require separate frequencies to transmit and receive, this device enables two different signals to overlap in frequency, which increases the bandwidth available to the system. The appliance uses an adaptive self-interference cancellation technique to subtract your transmitted signal to recover the desired signal. The canceller works with all modulation and FEC techniques on “bent pipe”, non-cross-strapped satellite networks to enhance the benefits of any advanced modulation techniques or turbo coding you may already use. The VPCMA-L is an RF appliance that is located between a satellite modem and its antenna. The unit intercepts the modem’s transmit signal, diverting a small amount of power to allow digital sampling. The rest of the transmit signal is then passed on to the uplink. The unit also intercepts the modem’s receive signal after the LNB, just before entering the modem’s Rx demodulator port. This signal is digitally processed and output to the modem’s Rx port. The sampled transmitted signal is digitally delayed, with time and frequency aligned with its return copy on the received signal. This allows for the signal transmitted by this terminal to be digitally subtracted from the received signal, thus canceling it on the receive path. The process can be done in the presence of other signals and Additive White Gaussian Noise (AWGN) on the receive path. This enables signals from the local terminal to share the same bandwidth as signals from remote
terminals. With a 1U form factor, the VPCMA-L fits in a standard rack and interfaces with any digital satellite modem. The device cancels signals with bandwidths of 2 to 72 MHz. The device is also available as a card in compact PCI form factor
