We present an expression for the probability density functions of the ON and OFF pixels of a 2:N constant-weight block code to estimate the raw bit error rate (BER). We also show that they are similar to Gaussian ones...
详细信息
We present an expression for the probability density functions of the ON and OFF pixels of a 2:N constant-weight block code to estimate the raw bit error rate (BER). We also show that they are similar to Gaussian ones through an analysis of an actual code image reconstructed from a multilayered waveguide holographic memory. From these results, we show that this expression for estimating the raw BER can be obtained using averages and standard deviations of the ON and OFF pixels. Finally, we demonstrate that the relationship between the signal-to-noise ratio and the raw BER derived from the expression for estimating the raw BER closely fits simulation results. This expression is useful for roughly estimating the value of the raw BER from the averages and standard deviations of the ON and OFF pixels.
For a two-dimensional constant-weight block code, we show that the recording density is proportional to code rate and the second power of the size of the bright point. Second, we show four constant-weight block codes ...
详细信息
For a two-dimensional constant-weight block code, we show that the recording density is proportional to code rate and the second power of the size of the bright point. Second, we show four constant-weight block codes (two 2:16 codes, a 4:24 code, and a 4:16 code) with different code rates. In simulation experiments, we measured the maximum size of bright points for each code, the bit error rate was practical (10(-4) or less), and simulation results show that the maximum size increases as the code rate decreases. Then, we show that the highest recording density is achieved with the two 2:16 codes and the 4:24 code and that these codes are suitable for orthogonal aperture-multiplexing. We also show that there is a trade-off between multiplexity and the code rate. [DOI: 10.1143/JJAP.47.8440]
暂无评论