【摘要】 提出了一种基于等误差原则的信道优化矢量量化器的设计方法。该算法通过在子区域误差较大的矢量附近产生新的矢量来代替子区域误差较小的矢量,从而逐渐平均各子区域误差,并同时使信道矢量量化器满足最近邻条件和质心条件,求得最优码书。采用该算法,在给定信道状态模型和信道噪声情况下,可有效地提高矢量量化器的性能,仿真实验结果表明该算法可获得比传统算法更优的性能增益。更多还原

【Abstract】 The paper presents a new algorithm to design channel optimized vector quantizer(COVQ) based on the partial distortion theorem . The algorithm creates new codebook vector which is in the near place of the sub region with the biggest subdistortion and then replaces the codebook vector of the smallest sub-distortion with this new codebook vector, therefore to equilibrate sub-distortion of all sub regions. The algorithm achieves a significant improvement of COVQ performance for a given noisy channel status model over other conventional VQ design methods, as confirmed by experimental results.更多还原