Linear approximation of the max* operation for log-map decoding
AssigneeFreescale Semiconductor, Inc.
InventorsGideon Kutz, Amir Chass
Life of this patent
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Abstract
A decoder for a wireless communication device comprising a calculator for calculating the modulo of a linear approximation of a MAX* function; and a selector for selecting a MAX* output value from the group a(n)modF, b(n)modF, and the calculated modulo based upon a determination as to whether a predetermined threshold value for |a(n)−b(n)| has been met, where a(n) is a first state metric, b(n) is a second state metric, C is the predetermined threshold value and F is a value greater than |a(n)−b(n)|.
Claims11
A decoder for a wireless communication device comprising;
- a calculator for calculating the modulo of a linear approximation of a MAX* function;
- and
- a selector for selecting a MAX* output value from the group a(n)modF, b(n)modF, and the calculated modulo based upon a determination as to whether a predetermined threshold value for |a(n)−b(n)| has been met, where a(n) is a first state metric, b(n) is a second state metric, C is the predetermined threshold value and F is a value greater than |a(n)−b(n)| whereby to enable the calculator to calculate the modulo of the linear approximation of the MAX* function using a modF function of a(n)modF, b(n)modF and C.
A method for generating a MAX* value, the method comprising:
- receiving a first modulo state metric a(n)modF, a second modulo state metric b(n)modF and a predetermined threshold value C for |a(n)−b(n)|, where F is a value greater than |a(n)−b(n)| whereby to enable the module of a linear approximation of a MAX* function to be calculated using a modF function of a(n)mod F, b(n)mod F and C;
- and
- selecting a value from the group a(n)modF, b(n)modF, and the calculated modulo based upon a determination as to whether the predetermined threshold value C for |a(n)−b(n)| has been met.
Dependencies are inferred from the claim text.