Abstract
Using a conventional demodulator, a sufficient condition to maintain orthogonal direct sequence-code-division multiple access (ODS-CDMA) codeword orthogonality is constant relative channel amplitude over the codeword duration. Fading produces a fluctuating amplitude that deorthogonalizes the codewords, resulting in an additional noise similar to the multiaccess interference (MAI) found in asynchronous DS-CDMA. For ODS-CDMA 4-PSK in a frequency-nonselective, shadowed Rician fading channel, we derive and evaluate: (i) an exact expression for the uncoded bit error probability, and (ii) an upper bound for the convolutionally-coded bit error probability. We find that the degradation to BER depends on both the fading parameters and the ODS-CDMA channel loading.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: 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.
