Abstract

In this thesis we evaluate by performance analysis and computer simulation the bit error and throughput characteristics of a new Code Division Multiple Access scheme. The new technique considered is of the Modified SUGAR/DS type. In this multiple access scheme, user signals may arrive in a code asynchronous fashion at the receiver. Each user is identified by an orthogonal waveform and a Gold code. The analytical results show the possibility of gaining a minimum of 2 dB in Signal-to-Noise Ratio by splitting the users into three or more groups in a PSWDS Spread Spectrum network. Both the chip synchronous and asynchronous cases are investigated. Also the uniform and optimal cases of dividing the total number of users into orthogonal groups are analyzed. Superior bit error and network data throughput results were observed in the different fading and FEC environments involved. By computer simulation we evaluate the bit error probability as a function of the number of users.