Abstract
In this letter, a novel method for modulation and demodulation of user information bit in spread spectrum code-division multiple-access (CDMA) systems is proposed. Synchronous CDMA poses intrinsic protection against co-channel interference due to orthogonal spreading codes used. However, in the presence of multipath, signals lose their orthogonality property, leading to an increased cross correlation. In this letter, we show that the performance of the system will be close to single user system if we assign two codes to each user and these two codes are used for modulation and demodulation. The well-known maximum length sequence codes are good candidates for the present modulation and demodulation technique. The limiting factor to the system capacity is the maximum number of codes and the capacity is half of that number.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.