Project Title: CDMA MODEM DESIGN USING DIRECT SEQUENCE SPREAD SPECTRUM
Spread Spectrum is just a style of modulation that spreads data transmission across available frequency band, in excess of minimum bandwidth required to send the information. Spreading makes signal resistant to noise, disturbance and eavesdropping. Spread Spectrum is commonly along with personal interaction products such as cell phones and LAN's. Spread Spectrum has its properties that are own unique can not be contained in other practices for instance the capacity to
eliminate or relieve disturbance that is privacy that is multi-path of to unknown random codes, multi-user control capability more than a regularity that is single power that is low depth since indication is spread over a regularity company that is musical is big. There are two main techniques to achieve spread range. The most frequent practices are Direct Sequence Spread Spectrum and Frequency Hopping Spread Spectrum. A DSSS transmitter converts an inbound information (bit) stream directly into a phrase flow. Employing a modulation that is digital likeBPSK or QPSK, a transmitter multiplies symbols by having a Pseudo noise rule that is random. This multiplication procedure artificially increases used bandwidth length that is considering of show. A CDMA system is implemented via these coding.Each user over a CDMA system is assigned an original PN rule show. Thus, more than one indication may be delivered at exact time that is exact same exact same regularity.