OFDM for variable channels

For variable channels we designed an OFDM technique, that offers maximum quality of service. It includes algorithm for fast synchronisation and reliable channel tracking. The coding and decoding schemes are well adapted to the channel characteristics and the application. We offer fixed frequency of frequency hopping systems for a wide range of data rates and bandwidths, for voice and data transmission with end-to-end digital encryption

Estimation of the channel

We developed efficient methods for

• Two-dimensional estimation in time- and frequency domain
• Optimisation of channel estimation parameters
• Minimisation of redundancy for channel estimation
• Iterative (turbo-) estimation

Synthesis and Optimisation of signal code construction for mobile channels

Our portfolio of OFDM signal code constructions allows to select the optimized solution for your application

• Concatenated signal-code-construction for OFDM in variable channels
• Iterative (turbo-) Decoding
• Signal code construction with 4D-Trellis code and Forney Trellis shaping
• Forward error correction for data transmission with Reed-Solomon and interleaving
• Error detection with CRC algorithm
• Maximum Likelihood decoding with Viterbi algorithm and channel information usage
• Software defined (configurable or automatic) bandwidth and data rate selection

Synchronisation

Our patented synchronisation procedures are unrivalled in today’s market

• Patented fast synchronisation with late-entry capability
• Fast and reliable synchronisation procedures without preamble (low redundancy)
• Fast and reliable synchronisation procedures with preamble (enhanced features)

Adaptation

Highest efficiency and reliability is guaranteed by adaptive algorithms

• Adaptive Front-End Filtering
• Adaptive multistage equalizer
• Robust channel estimation including flat and selective fading
• Robust tracking in channels with Doppler shift, Doppler spread and multipath signal propagation