About using Walsh matrix as spreading sequence

1. What is a Walsh code in wireless communication?
2. What is Walsh function in image processing?
3. How do I generate a Walsh code?
4. What is Walsh table?

What is a Walsh code in wireless communication?

Walsh Code is a group of spreading codes having good autocorrelation properties and poor cross correlation properties. Walsh codes are the backbone of CDMA systems and are used to develop the individual channels in CDMA. For IS-95, there are 64 codes available.

What is Walsh function in image processing?

The Walsh-Hadamard transform is used in a number of applications, such as image processing, speech processing, filtering, and power spectrum analysis. It is very useful for reducing bandwidth storage requirements and spread-spectrum analysis.

How do I generate a Walsh code?

Orthogonal codes are easily generated by starting with a seed of 0, repeating the 0 horizontally and vertically, and then complementing the 1 diagonally. This process is to be continued with the newly generated block until the desired codes with the proper length are generated.

What is Walsh table?

In mathematics, a Walsh matrix is a specific square matrix of dimensions 2ⁿ, where n is some particular natural number. The entries of the matrix are either +1 or −1 and its rows as well as columns are orthogonal, i.e. dot product is zero. The Walsh matrix was proposed by Joseph L. Walsh in 1923.