Methods for simplified MMI VQ based HARQ buffer reduction for LTE

摘要

Methods of simplified MMI VQ based HARQ buffer reduction are disclosed. In one embodiment of the invention, the VQ obtains distribution information from source data based on a predefined codebook subset design. The subset design is predefined. Source data is trained within its corresponding subset to generate codebook. In one embodiment of the invention, the predefined subset algorithm is based on the LLR sign value. In another embodiment of the invention, source data is divided into subset based on predefined algorithm. The index to codebook is generated by search through the corresponding subset of the codebook instead of the whole codebook. In one embodiment of the invention, the training method is a modified Lloyd algorithm for MMI VQ. In another embodiment of the invention, the training method is a modified Lloyd algorithm for Euclidean distance VQ.

主权项

1. A method, comprising:
obtaining distribution information from a set of source data vectors based on a predefined codebook subset design; determining a codebook item number NS for each codebook subset based on a predefined codebook length L and the distribution information; partitioning each source data vector into its corresponding codebook subset; training the source data vector within its codebook subset; and assigning a default codebook vector value to any codebook subset that does not have any source data vector in it.