US 7,613,269 B2Granted

Method for calculating equal error protection profiles

AssigneeKeystone Semiconductor Corp.

InventorsChung-Jung Huang, Tsai-Sheng Kao

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Abstract

A method for calculating equal error protection (EEP) profiles is disclosed. The method uses a profile function related to a sub-channel size to calculate EEP profiles and then uses the EEP profiles to decode data. When a receiver receives a protection level and a size value of the sub-channel size, a corresponding sub-channel size can be rapidly obtained through a reference table of the protection level and the sub-channel size so as to calculate the required EEP profiles. The method in the present invention requires only a few adders/subtractors and shifters or an easily realizable multiplier to calculate the profiles so that the objective of effectively saving cost and rapidly obtaining the profiles is achieved.

Claims7

Dependent claims

A method of calculating equal error protection (EEP) profiles, suitable for calculating the EEP profiles according to a size function x=a*n and a profile function y=b*n+c, wherein a, b and n are positive integers and c is an integer, and using the EEP profiles to decode a stream of data at a bit rate, comprising:

using a receiver to receive a protection level and a size value S of a sub-channel size, wherein S=a*n and S is a positive integer;
setting b/a=z*2m so that the profile function is represented by y=(z*2m)*S+c and using a calculating unit to obtain the values of z and m, wherein m is an integer and z is any number greater than zero;
and
using the calculating unit to calculate (z*2m)*S+c and obtain a profile y, wherein
if m=0, then the size value S is directly used in the calculation,
if m>0, then a shifter is used to shift the bits of the size value S forward by |m| digits, and
if m<0, then a shifter is used to shift the bits of the size value S backward by |m| digits.

4 more elements

Dependencies are inferred from the claim text.