The Design And Realization Of Indoor Communication/Location System With UWB Based On FPGA

With the rapid development of social economy, people's requirement for the pre-cision of wireless location services is increasing highly. In the indoor environment,the none-line-of-sight(NLOS) and multi-path interference lead the precision of indoorlocation to be reduced greatly. However, the Ultra Wide-Band(UWB) impulse radioby producing ultra-short duration pulses get ultra wide band signals characterized byextremely low power spectral densities and extremely wide frequency band. This kindof signal is potentially immune to multi-path fading, has very good time-domain res-olution, and also has the ability of resistant to channel multi-path. In a word, all thecharacteristics of the UWB signal make it widely used in communication and locationsystems.In the UWB wireless location system, the capture of synchronization and theimpulse detection (time of arrive, TOA) are quite di?cult to realize, and also theimportant factors on system performance. At present, the UWB pulse detecting so-lutions can be divided into two categories: the coherent detection method and thenon-coherent detection method. The non-coherent energy detection of TOA estima-tion system[1] which is simple in structure and low cost has become a hot spot of thecurrent studies. This project aims to achieve an indoor communication and precisionpositioning system with UWB, and the focus of this paper is to complete the base-bandpart design of the system on FPGA.This paper studies the positioning system based on UWB communication withFPGA design and implementation, including the UWB signal design and produce;the non-coherent energy detection receiver design; the linear stepper for synchronouscapture algorithm design; the impulse detection for location; the positioning algorithmand testing project design. The point of this paper is to combine the capture ofsynchronization and the impulse"coarse detection"into one process, then carry outthe"fine detection", thereby improving the accuracy of positioning at the same timesimplifying the structure of the receiver. Through the design and simulation of thebase-band part of the UWB system with VHDL language, together with the circuittesting, ultimately realized the UWB communication/location system test and achievedgood positioning accuracy.