1 research outputs found
On chip pulse shape design for precise synchronization of DS-CDMA systems
In this work, a methodology is established to design optimum chip pulse shapes which are absolutely
bandlimited, their energy mainly concentrated in the chip duration, and which minimize the variance
of the time-delay estimation error of an unbiased estimator. The low-complexity optimization method is
based on the prolate spheroidal wave functions. Thus, the variational problem at hand can be transformed
into a tractable parametric optimization problem. It is shown that the designed optimum chip pulse shapes
significantly improve the synchronization performance of direct sequence code-division multiple access
systems by minimizing the Cramer–Rao lower bound (CRLB). The time-delay estimation bias under the
presence of multipath is compared with the conventionally used bandlimited rectangular chip pulse shape