ABSTRACT: Through analyzing the theoretical spreading principle, it has been proved in this paper that the benefit of pseudo-orthogonal
carrier interferometry (PO-CI) spreading code is not supported when complex signal modulation (e.g., quadrature phase-shift
keying (QPSK) and quadrature amplitude modulation (QAM)) types are employed. On this basis, a novel and feasible structure
for this problem is brought forward. Within the structure mentioned, instead of complex modulation patterns, pulse amplitude
modulation (PAM) combined with PO-CI spreading code is utilized. This allows us to maintain the throughput increase of a multi-carrier
code division multiple access (MC-CDMA) system with minimal loss in performance and no bandwidth expansion.
Frontiers of Electrical and Electronic Engineering in China 01/2008; 3(2):145-149.
Proceedings of the 67th IEEE Vehicular Technology Conference, VTC Spring 2008, 11-14 May 2008, Singapore; 01/2008
ABSTRACT: The non-line-of-sight (NLOS) propagation has become a key obstacle to high accuracy location in urban environment. In this paper, a novel algorithm is proposed based on classical scattering models to mitigate the NLOS errors in location estimation. With distributed multi-antenna, the location of the scatterer that causes the NLOS errors is estimated, and the distance between the mobile station (MS) and the scatterer is also obtained. Then the estimated scatterers are used as virtual base stations (BSs) to locate MSs. Simulation results show that the proposed NLOS mitigation algorithm outperforms other algorithms, which indicates our NLOS mitigating method can be applied in NLOS environment effectively.
Personal, Indoor and Mobile Radio Communications, 2007. PIMRC 2007. IEEE 18th International Symposium on; 10/2007
Proceedings of the 66th IEEE Vehicular Technology Conference, VTC Fall 2007, 30 September - 3 October 2007, Baltimore, MD, USA; 01/2007