Howtosignalprocessing
- What is orthogonal codes in CDMA?
- How are orthogonal codes generated?
- What is the use of orthogonal codes in IS-95 CDMA one standard?
- What are spread spectrum orthogonal codes?
What is orthogonal codes in CDMA?
An optical orthogonal code (OOC) is a family of (0,1) sequences with good auto- and cross-correlation properties; they are used as a means to obtain code division multiple access (CDMA) on fiber optic networks. Previous work on OOC has assumed that the weight of each codeword is the same.
How are orthogonal codes generated?
Orthogonal codes are easily generated by starting with a seed of 0, repeating the 0 horizontally and vertically, and then complementing the 0 diagonally. This process is continued with the newly generated block until the desired codes with the proper length are generated.
What is the use of orthogonal codes in IS-95 CDMA one standard?
This pseudo orthogonal property is used in IS-95 reverse link in a 1.2288Mcps chip sequence to differentiate between mobiles. On the forward link the long code is decimated down to a 19.2kbps bit stream for a unique user mask.
What are spread spectrum orthogonal codes?
This is achieved through the use of spreading codes, whereby a single data bit is "spread" over a longer sequence of transmitted bits. These codes, known as chip sequences, must be carefully chosen so that the data may be correctly "despread" at the receiver. Such codes are known as orthogonal codes.
