SPACE CORRELATED U-PN CODES – A POSSIBLE SOLUTION FOR THE NEW MICROWAVE COMMUNICATION AND RADAR SYSTEMS
A retrospective review of a new approach, named Space Correlated U-PN codes, is given in this report. It is particular useful as spread spectrum radio access technology in the mobile broadband communication and radar systems with integrated terrestrial – satellite positioning. The principles of U-PN codes generation, as well as the basic methods of their acquisition and tracking, are given too.
The proposed SC-CDMA principle uses several space distributed sources of radio-signals. The signals are phase modulated by appropriate PN-codes. The Mobile Stations (MS) receive these signals by means of the well known CDMA technology. For this purpose the same PN- codes are generated and synchronized in the MS receiver. The sum(mod2) of these codes creates a new code, which we named U (Unique)- PN code. This code is used for spreading the information, transmitted by the MS. Similar approaches are used for generation of the Base Station (BS) U-PN codes. Proposals of realistic SC-CDMA mobile communication and SC-MRN radar systems, based on the well developed GPS navigation, are shown in the end of the report.