Method of using a direct sequence spread spectrum in vehicle location approximation when using orthogonal frequency-division multiplexing

• Main Author: Shan, Tiejun
• Format: Patent
• Language: English
• Published: 06.10.2020
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; TESTING; TRANSMISSION; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

A method for target location approximation using orthogonal frequency-division multiplexing (OFDM) is provided with an OFDM device that consists of a wireless terminal and a multiple-input and multiple-output (MIMO) antenna. In order to derive a location approximation, a pilot uplink signal is transmitted through the wireless terminal towards at least one intended target. The pilot uplink signal that is transmitted is encoded as a direct-sequence spread spectrum (DSSS). Next, a reflected-pilot uplink signal is identified from an ambient signal that returns after the initial transmission. The reflected-pilot uplink signal is decoded to retrieve the original data embedded in the pilot uplink signal. A matching time delay is calculated between the pilot uplink signal and the reflected-pilot uplink signal. A direction of arrival (DOA) is determined from the MIMO antenna. Finally, the matching time delay and the DOA are used for location approximation.