A Real-Time Image Transmission Scheme for Pilotless Aircraft
Rong Liu, Xiaolin Zhang · Beijing Hangkong Hangtian Daxue xuebao · 2002
In the present scheme, an integer wavelet transform algorithm with modified set partitioning in hierarchical trees(SPIHT) coder was introduced to compress images. RS, symbol interleaves and trellis coded modulation(TCM) with multi level quadrature amplitude modulation(QAM) were used to get an excellent forward error correcting ability. Orthogonal frequency division multiplexing(OFDM) scheme was adopted to improve spectrum efficiency and to decrease the average power. Bit error probability of the scheme was analyzed. The scheme was shown to possess higher compression rate, stronger progressive transmission ability, better numeration efficiency and more excellent error resilience. Together with a performance of multi path resilience and echo resilience, the above advantages make the proposed scheme compliant with pilotless aircraft conditions and feasible in practice.