We help our customers to optimise the performance and cost of their radio modem products
We design radio modems to improve system capacity and power, radio spectrum and cost efficiency, and reduce interference and detectability of wireless communication. We have extensive knowledge of key modem techniques; modulation and channel coding (QAM, turbo and LDPC codes), synchronisation and channel estimation, adaptive transmission and reception, including transmitter power control and adaptive modulation and coding, MIMO systems, including antenna diversity, beam forming, and spatial multiplexing, specific techniques for security and robustness improvement, and modelling and compensation of nonlinearities (power amplifiers, mixers, and oscillators) in modem analogue parts.
We have particularly extensive experience in the use of adaptive multi-carrier techniques, including orthogonal frequency division multiplexing (OFDM) and orthogonal frequency division multiple access (OFDMA).
A key benefit of our technologies and solutions is the integration of wide and deep knowledge of the digital communication and signal processing methods needed in digital transceivers, as well as our know-how in hardware and software implementation technologies and their constraints.
Meeting a range of challenges
We have developed radio modem solutions for mobile, Wi-Fi, military and space communication and for both micro and millimetre wave fast links and networks, and low power sensor networks. We have over 20 years of experience in this technology field.
VTT has played a leadership role in developing methods, modem concepts and prototypes for 3G and 4G/LTE evolution mobile communication systems. We have also been involved in the development and prototyping of transceiver concepts for WiMAX radios and networks. Our radio modem technologies have been used in the design of end-user devices, base stations access points, and other network equipment.
In our R&D we have worked mostly with the following standards: 3GPP HSDPA, HSUPA, HSPA+, 3GPP LTE and LTE-A evolution, IEEE 802.11, 802.15, 802.16, 802.22 evolution and ECMA-368 and ECMA-387. Our key challenge during the last few years has been the development of methods for reducing energy consumption, improving the energy efficiency of radio modems and radio systems, and increasing the intelligence of radio modems through cognitive features.