2 research outputs found
Iterative ('Turbo') Multiuser Detectors For Impulse Radio Systems
In recent years, there has been a growing interest in multiple access
communication systems that spread their transmitted energy over very large
bandwidths. These systems, which are referred to as ultra wide-band (UWB)
systems, have various advantages over narrow-band and conventional wide-band
systems. The importance of multiuser detection for achieving high data or low
bit error rates in these systems has already been established in several
studies. This paper presents iterative ('turbo') multiuser detection for
impulse radio (IR) UWB systems over multipath channels. While this approach is
demonstrated for UWB signals, it can also be used in other systems that use
similar types of signaling. When applied to the type of signals used by UWB
systems, the complexity of the proposed detector can be quite low. Also, two
very low complexity implementations of the iterative multiuser detection scheme
are proposed based on Gaussian approximation and soft interference
cancellation. The performance of these detectors is assessed using simulations
that demonstrate their favorable properties.Comment: To appear in IEEE Transactions on Wireless Communication