基于多码率Turbo编码和空时OFDM的鲁棒累进图像传输

设计了一种多码率的Turbo编码器，该编码器在引入很少系统复杂性的前提下，采用了多个生成多项式，大大增加了所能覆盖的码率范围．在此基础上，根据Alamouti的空时分组编码和OFDM技术，提出了一种鲁棒的宽带无线图像传输方案．该方案结合多码率的Turbo编码技术，对SPIHT图像码流采用了非均衡错误保护的联合信源信道编码技术，有效地抵抗了宽带Rayleigh衰落信道中的衰落效应，并能较好地改善重建图像的视觉质量．

Robust Progressive Image Transmission Based on Multi-Rate Turbo Code and Space-Time OFDM

A multi-rate turbo coder was designed, which adopts multiple generator and can cover wide code-rate range, while the complexity of the system is not increased much. Based on Alamouti space-time block code (STBC) and orthogonal frequency division multiplexing(OFDM), a robust broadband wireless image transmission scheme was put forward. With multi-rate turbo coder technology, the scheme adopts unequal error protecting (UEP) of the SPIHT bit streams and joint source-channel coding (JSCC) techniques, and can effectively resist the fading impact of the broadband Rayleigh fading channel. Moreover, it can improve the visual quality of the reconstructed image.