Ultra Wide Band Multiple Access By Using DS-BPSK

According to the modern definition, any wireless communication technology that produces signals with a bandwidth wider than500MHz or a fractional bandwidth greater than0.2can be considered as UWB.UWB allowed delivering megabits of data with Low average power consumption and operate in the unlicensed spectrum of3.1to10.6GHZ.There are several possible pulses shapes such as Gaussian Doublet Pulse Shape, Gaussian Monocycle Pulse Shape, Gaussian Pulse Shape and Rectangular Pulse Shape, The choice of pulse shapes will affect the system performance because, UWB waveforms occupying large bandwidths.The performance of system in UWB investigated in a multiuser and multipath environment that needs spread spectrum technique like time hopping (THSS) or Direct Sequence Spread Spectrum (DSSS) which is a well-known multiple access technique,specially in cellular mobile radio communications because several users are allowed to share the same frequency band without interference from each other, with the modulations such as pulse amplitude modulation (PAM), pulse position modulation (PPM) and pulse shift keying (PSK), In this research DS-BPSK has used, It is shown that the DS multiple access has the potential to reach higher data transmission rates.UWB Performance is validated over an AWGN for single user and then for multiuser that has interference, UWB performance with MA has Synchronous case, for this case the network of10users and one code types with31length codes (IR) have done.