Concept of a wireless indoor video communications system1
The aim of this paper is to describe and specify the concept of a future wireless indoor video communications system. The radio frequency link operating in the 2.4/5.8GHz ISM-band is considered as the transmission medium. First, the general concept of the system which is based on a decentralized/distributed topology is illustrated in detail. Then, the physical layer of the system which is based on a combination of TDMA and FDMA is examined. The system supports variable rate transmission and is flexible. As modulation both QPSK and 16-QAM are taken into account. The channel coding is based on a powerful ReedSolomon code. The control signals, sent at the beginning of the TDMA frames, with carrier-sensing based on correlation are used to detect the free time-slots. An example of the access to the network is given. Furthermore, the simulation results with a link-budget evaluation are analyzed. It is shown that the maximum data rate at 2.4GHz, using a 16-QAM modulation can be up to 26.8Mbit/s.
wireless indoor video communications ism-band modulation channel coding decentralized network physical-layer fdma/tdma carrier sensing equalization synchronization