Channel Coding & Modulation
Channel coding and modulation is an important research area at the institute, especially with regard to speech and audio transmission over mobile radio channels. The work at the institute mainly focuses on joint, iterative source-channel decoding. If higher order modulation schemes are used, an additional iterative loop containing the demodulator can be considered at the receiver. The resulting system is called Turbo DeCodulation.
If speech, audio, or image data have to be transmitted with little effort, i.e., without using channel coding (for instance via Bluetooth), the MUPA scheme can be used. This scheme realizes a modulation with unequal power allocation which is optimized such that a better reconstruction quality can be achieved at the receiver, if compared to conventional modulation schemes.