FH Codes for Use in CDMA and the Study of its Long Distance FH Patterns

摘要

In this paper,a class of codes nearly ideal characteristics for use in multiple access spread spectrum system is obtained by construction of a type of Latin square matrix;and studied the codes properties in the synchronous and asynchronous case.By the long -distance frequency-hopping control in this system,the average collisions redueed 1/2 in the asynchronous transmission type.In the same time,we proved that d=(p-1)/2 is the largest FH distance,and proved that the frequencies are uniformly distributed in the available bandwidth.This makes it,possible to use frequency band effectively and to have lower error probability.