PRBS Selection for Velocity Measurements with Compressive Sampling-Based DS-CDMA Radio Navigation Receivers

Abstract

The use of spread spectrum techniques is well consolidated in satellite radio navigation and communication systems, since several years. More recently, the Direct Sequence Spread Spectrum approach has found adoption also in Random Demodulation-based schemes implementing the so-called Compressive Sampling theory, that allows spread spectrum receivers to lower their sampling rate, thus overcoming the need to tradeoff sampling frequency and resolution in Analog to Digital Conversion. The obtainable performance are affected by several conditions, among which the selection of the chipping sequence to use. In this paper, different families of pseudorandom binary sequences are analyzed with respect to relevant identified metrics, for the possible improvement of velocity measurements with DS-CDMA radio navigation systems, when the classic Nyquist sampling receiver is replaced by a Compressive-Sensing based one. The simulation results show that the classical maximal length sequences can satisfy the requirements of both velocity measurements improvement and spread spectrum receiver at lower sampling rate.