A Frequency Mapping Coding (FMC) scheme varies the application of error correction redundancy to transmitted data based on the channel transmission characteristics and the likelihood of error resulting from characteristics of the data stream being transmitted over the channel. The FMC is an error correction coding scheme making use of the non-linear feed-back mechanism and variable bit input step size to control redundancy applied. The FMC scheme accommodates the non-symmetrical nature of the SNR in bandwidth limited communications environments such as DSL to allow application of IQ based modulation, such as QAM, to these channels and is flexible for varying channel characteristics.

Title
Frequency mapped coding for signal error correction
Application Number
10/676053
Publication Number
20040117712
Application Date
September 30, 2003
Publication Date
June 17, 2004
Inventor
Dongtai Liu
Fremont
CA, US
Yanbin Yu
Fremont
CA, US
William Xiao Qing Huang
San Ramon
CA, US
Agent
Felix L Fischer Attorney At Law
CA, US
IPC
H03M 13/00
H03M 07/00
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