发明名称 Compensation factor reduction in an unrolled decision feedback equalizer
摘要 An unrolled decision feedback equalizer (DFE) as disclosed herein has a reduced number of compensation factors while keeping a suitable performance level for a given application. The KN possible DFE correction levels are reduced or compressed into fewer levels (R), merging together the levels that are the closest together where K represents the number of possible symbols in each baud, or the number of bits encoded into each baud, and N represents the DFE depth in number of bauds. A mapping function is then provided to convert the KN combinations of previous history bits into R sampler selections.
申请公布号 US8885699(B2) 申请公布日期 2014.11.11
申请号 US201414157000 申请日期 2014.01.16
申请人 PMC-Sierra US, Inc. 发明人 Gagnon Mathieu
分类号 H03H7/30;H04L25/03 主分类号 H03H7/30
代理机构 代理人 Haszko Dennis R.
主权项 1. A method of operating an unrolled Decision Feedback Equalizer (DFE) having a plurality of input samplers, the method comprising: a) creating a reduced set of compensation factors (R) based on an original set of compensation factors (KN) for the unrolled DFE, where R<KN, and where K represents number of bits encoded into each baud, and N represents the DFE depth in number of bauds; b) applying the reduced set of compensation factors as input sampler thresholds for the plurality of input samplers to generate a reduced set of unrolled DFE decisions, the number of input samplers being no more than R; and c) selecting an appropriate DFE decision from the reduced set of unrolled DFE decisions based upon previous bit values and in accordance with a mapping table, wherein step a) comprises: a0) merging the original set of compensation factors until their number reaches a pre-defined target R and keeping track of which levels in the original set of compensation factors were merged together; anda1) computing a mapping function to map between the previous bit values and the new input sampler thresholds; creating the mapping table based on the mapping function; and assigning values of a mapping table by assigning an increasing index value for each unique value of the unique index list.
地址 Sunnyvale CA US