| CDMA ( Code Division Multiple Access) is one kind of the new and mature wireless communication technique based on spread spectrum, which is one path of the figure technique. The basic element of CDMA is to construct a kind of spread sequence which has the excellent self-correlation and inter-correlation, at the same time, it must have enough coding sequences to meet the need of the multitudinous users. Though, in the existing spread sequences system, m and Gold sequences are used widely, which are generated by the longest linear shift register, they all have the limitation of length and number in some sense.Theoretically, the characters of the chaos sequences are that the self-correlation is 6 function and the inter-correlation is zero., additionally, there are a great many codes .Thus, replacing traditional spread sequences by chaos ones will make the best use of the spread spectrum communication technique. But, actually, chaos sequences often lose its good characters in the real using, thus, this paper mainly focuses on below:1. select a good way to generate the chaos sequence, keep the character of the sequence effectively.2. select a good way to release the information from spread.3. realize the chaos sequences and the release by hardware-DSP, simulate the process of one user of the CDMA .As a result, the mixed chaos is reasonable and have kept the good characters of the sequence, and the way to release the information is effective. |
