伴随长期演进(Long Term Evolution,LTE)标准的应用,对上下行链路传输速率的需求大幅提高,使得分布式基站传输的数据量也对应增长,而目前硬件设备所能提供的接口速率是有限的。要解决这种不匹配的情况,可以在传输前对基站数据进行压缩...伴随长期演进(Long Term Evolution,LTE)标准的应用,对上下行链路传输速率的需求大幅提高,使得分布式基站传输的数据量也对应增长,而目前硬件设备所能提供的接口速率是有限的。要解决这种不匹配的情况,可以在传输前对基站数据进行压缩。鉴于基站数据的统计分布和合成孔径雷达数据的统计分布相似,本文参考合成孔径雷达(Synthetic Aperture Radar,SAR)数据的压缩方法—分块自适应量化(Block adaptive quantization)压缩算法,将该算法改进后应用于基站数据压缩。该方法首先将IQ数据(In-phase and quadrature data,IQ data)分块,通过变换使得数据块服从标准正态分布,将块内数据与最佳电平阈值进行比较然后编码。计算机仿真结果表明,BAQ算法能够应用于压缩IQ数据。展开更多
Fractal image compression is a completely new method to compress images by searching and exploiting the self similarity of the whole image . Fractal Block Coding (FBC) is a practicable fractal coding schem...Fractal image compression is a completely new method to compress images by searching and exploiting the self similarity of the whole image . Fractal Block Coding (FBC) is a practicable fractal coding scheme with annoying slow encoding speed . In this paper, we classify the image blocks by Classified Vector Quantization (CVQ) technique and present an Adaptive Block Truncation Coding (ABTC) scheme to process the midrange blocks in the image. By this method , we reduce the encoding time to one forty fifth comparing to ordinary FBC method with little change in compression ratio and a little decreased coded image quality.展开更多
文摘Fractal image compression is a completely new method to compress images by searching and exploiting the self similarity of the whole image . Fractal Block Coding (FBC) is a practicable fractal coding scheme with annoying slow encoding speed . In this paper, we classify the image blocks by Classified Vector Quantization (CVQ) technique and present an Adaptive Block Truncation Coding (ABTC) scheme to process the midrange blocks in the image. By this method , we reduce the encoding time to one forty fifth comparing to ordinary FBC method with little change in compression ratio and a little decreased coded image quality.
