TR-O-0037 :March 31, 1991

Takeshi Manabe and Hitoshi Takai

Superresolution of Multipath Delay Profiles Measured by PN Correlation Method and Its Application to lndoor Propagation Analyses

Abstract:Time resolution of multipath delay profiles measured by using autocorrelation of pseudonoise (PN) code sequence is generally limited by the chip interval of the PN code sequence. In this paper, we propose a superresolution PN correlation method (SPM) which improves the time resolution of delay profiles measured by the conventional PN correlation method. The SPM is based on a decomposition of the eigenvector space of the correlation matrix delay-profile data vector and gives the number of paths and their delay times with higher resolution. It is verified by computer simulations and experiments using coaxial delay lines that the SPM can resolve two paths with a delay difference of a few tenths of the chip interval. Applicability of the SPM to the analysis of indoor multipath environment in which many delayed waves arrive with short delay differences is demonstrated by a indoor radio propagation experiment at 240 MHz, 910 MHz, and 2.3 GHz.