When using vitdec function for testing error coming like "inputs must be a scalar and a square matrix. To compute elementwise POWER, use POWER (.^) instead"

I am trying to test the vitdec function using soft decision. At this time, I am getting error as "Inputs must be a scalar and a square matrix.To compute elementwise POWER, use POWER (.^) instead"

Syntax used for viterbi decoder is given below,

decoded_data = vitdec(out_interleaved, trellis_type,34,'trunc','soft','32');

Where out_interleaved is an array which contains signed fixed point values

Also I am having one doubt that Does the vitdec function accepts only positive integer value for soft decision based method?

Please help me to solve this problem

Answer 1

[Tamil selvan]

Sorry. I found that the number of soft precision bits must be less than 14bits. So I have used 7 for soft precision bits.

Syntax after the modification decoded_data = vitdec(out_interleaved, trellis_type,34,'trunc','soft','7');

Still I am getting error as Number of soft decision bits must be a positive scalar integer.

Note: I am feeding both positive and negative values to the vitdec function.

[Walter Roberson]

I think it should be 7 rather than '7'