Provigent Inc. is now shipping a single-chip modem for point-to-point broadband wireless systems that uses XPIC (cross-polarization interface cancellation) technology. Co-channel dual-polarization (CCDP).
Provigent's PVG310 modem supports CCDP (co-channel dual-polarization) transmission that promises to double wireless channel capacity.
CCDP enables the simultaneous transmission of two separate data streams on two polarizations of a single channel (see diagram), thus doubling capacity.
Co-channel dual-polarization (CCDP).
The product is designed for point-to-point radios, either low capacity or high capacity, for both indoor or outdoor units. PVG310 is optimized for high frequencies. However, it can be used for radios operating in the 7 GHz to 56 GHz frequency band range, according to Ran Soffer, Provigent's marketing director.
The PVG310 modem supports a net payload of up to 311 Mbps over 28 MHz channels and up to 622 Mbps over 50/56 MHz channels, with a spectral efficiency of 13.5 bits/Hz.
Additionally, PVG310 has a single-polarization fallback feature that can maintain a connection under adverse conditions.
"When the connection between the link is very bad, the connection can die. [With PVG310 technology,] the operator can ask for half capacity in a momentarily bad connection." Soffer explained.
Another advantage of PVG310 is that it can be installed using existing radio equipment. Soffer explained that an operator could use an indoor unit that supports XPIC and connect via an RF section that is not based on XPIC. This works because Provigent's technology allows operators to use two different clock sources rather than the same clock source to synchronize the horizontal and vertical streams.
Soffer said that Provigent is the first system-on-a-chip solution provider to introduce XPIC technology for the broadband wireless transmission industry.
Provigent, a fabless semiconductor company, was established four years ago and has raised $19 million in venture capital funding. The company is squarely aiming at serving the point-to-point broadband wireless market.
Soffer said that in three to five years, the cellular market will drive the point-to-point market. He also expected that Provigent would get a boost from future WiMAX deployments. WiMAX is point-to-multipoint technology, so it will still require backhaul support by high-capacity point-to-point systems.
