Today, the market for high-speed satellite communication systems (especially the provision of broadband services) It is rapidly developing, offering all kinds of telecommunications services to corporate and individual clients. At the same time, an important and, perhaps, the main problem for operators remains the issue of reducing costs and increasing the efficiency of using the satellite resource, since it is still scarce and expensive. Sibelektronimport offers a solution that can significantly improve the efficiency of using satellite channels and the quality of work via satellite for various applications, while significantly reducing the costs of operators: a satellite signal compensator operating in the L-band to save the VPCMA-L frequency band.
At the moment, there are various technologies for improving the efficiency of using the satellite resource. One of these technologies is the combination of the frequencies of the forward and reverse channels. It is believed that ViaSat was the first to offer such a solution, calling it Paired Carrier Multiple Access (shared access to the band by a pair of carriers - PCMA). This technology is implemented in the devices of VPCMA-L.
As is known, in traditional VSAT networks, the forward and reverse channels operate at different frequencies, which means that the frequency resources required for their formation are summed up. When using the technology of combining the forward and reverse channels are transmitted in the same frequency band, which significantly reduces the need for satellite resources. In this case, the receivers at all stations of the network receive both direct and reverse channel signals from the satellite and must "be able" to allocate the signal they need. Since the power of the direct signal is significantly higher, remote terminals easily allocate it, perceiving the signal of the reverse channels as noise. At the central station, it is necessary to filter out a more powerful signal of the direct channel. To do this, a mechanism is used in which the TS equipment "remembers" the transmitted signal (direct channel), and then, having received the forward and reverse channels superimposed on each other, simply subtracts it, thus allocating the necessary (reverse) channels. Thus, the satellite signal compensator for saving the VPCMA-L frequency band allows you to maximize the performance of satellite networks.
The VPCMA-L is a radio frequency device that is located between a satellite modem and its antenna. The device intercepts the modem transmission signal, redirecting a small part of the power so that digital sampling is possible. The rest of the transmission signal then passes to the reverse channel (uplink). The device also intercepts the receiving signal of the modem after the low-noise block, just before it gets to the receiving port of the modem demodulator. This signal is digitally processed and goes to the receiving port of the modem. The discrete transmitted signal is digitally delayed so that the time and frequency coincide with its reverse copy on the received signal. This makes it possible for the signal transmitted using this terminal to be digitally extracted from the received signal, thereby removing it on the receiving path. This process can be performed in the presence of other signals and Additive White Gaussian Noise (AWGN)) on the receiving path. This allows the signal from the local terminal to use the same frequency band that is used by signals from remote terminals.
By simply adding this device to your satellite network, you can increase the performance of transponders, free up frequencies for additional purposes and reduce the operating costs of your network. For example, while the costs of operators for the space segment can vary significantly depending on the location and nature of use, a network operator who pays $ 4,000 for 1 MHz per month when using 54 MHz can save up to $ 907,200 per year on the frequency band when using a VPCMA-L device.
Distinctive properties of the satellite signal compensator VPCMA-L:
- Programmable compensation frequency range grades: 2 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz, 36 MHz, 54 MHz, 72 MHz
- One device for multiple network architectures
- Does not depend on the modem and the signal form
- Works with any standard modulation types (spectrum extension, BPSK, QPSK, 8-PSK, hexadecimal, etc.)
- Does not depend on the type of encoding used (works with Viterbi, Reed-Solomon, LCPC, Turbo, etc.)
- Compact 1U form factor for mounting in a 19-inch rack (there is an option in a compact PCI card form factor)
You can learn more about the models of the satellite signal compensator VPCMA-L in our catalog, and we also offer you to download the device specification for review.
Specification of VPCMA-L (2.76 Mb)