Category: 相干光通信

概率整形和几何整形

1. 概率整形

a. the low-amplitude constellation points are sent with a high probability than the high-amplitude ones. Besides, the constellation points under the same amplitude layer are sent equally likely. Therefore, the average symbol power will be decreased, but at a cost of lower source entropy.

b. The first PS scheme was proposed by Gallager, which is based on many-to-one mapping.

c. There are some methods proposed to further reduce the complexity of CCDM, like multiset-partition distribution matching and sreaming distribution matching.

2. CCDM

a. K-L散度（相对熵）

jianshu.com/p/43318a3dc715

b. All approaches are variable length, which can lead to varying transmission rate, large buffer sizes, error propagation and synchronization problem.

fixed-to-fixed length codes do not have these issues.