Aplicaciones avanzadas del principio superregenerativo a comunicaciones por radiofrecuencia
- Autores: Alexis López-Riera
- Directores de la Tesis: Pere Palà Schönwälder (dir. tes.), Jordi Bonet Dalmau (codir. tes.)
- Lectura: En la Universitat Politècnica de Catalunya (UPC) ( España ) en 2017
- Idioma: español
- Tribunal Calificador de la Tesis: Almudena Suárez Rodríguez (presid.), Eduard Alarcon Cot (secret.), Gonzalo Seco Granados (voc.)
- Programa de doctorado: Programa de Doctorado en Teoría de la Señal y Comunicaciones por la Universidad Politécnica de Catalunya
- Materias:
- Enlaces
- Tesis en acceso abierto en: TDX
- Resumen
There exists today an increasing demand for wireless devices which require low cost and minimum power consumption radiofrequency front-ends. Precisely, these are two remarkable characteristics of the superregenerative receiver (SR). In this thesis, we present some novel applications of the SR receiver which make use of both simple methods and simple implementations that fit perfectly with its main features.
The superregenerative reception principle was presented for the first time in 1922, and it was initially used with analog amplitude modulations, such as voice communications. The same principle was spread to digital amplitude modulations in applications where data transmission was required. Moreover, it has also been used in frequency modulation reception through an FM-to-AM conversion mechanism, but due to the inherent characteristics of the receiver, it is only suitable with wide band modulations.In the latest few years, some SR receiver proposals for phase modulation detection have emerged. It has been demonstrated that, with this type of modulation, the resulting architecture might be even simpler than the traditional ones devoted to detect amplitude modulations.
This thesis advances in this line and its main goal is to discover new possibilities of the SR receiver in angular modulation detection, which have been little exploited so far. With this aim, a variety of prototypes were designed and implemented for PSK modulations on the one hand and, on the other hand, for narrow band FSK modulations.
More specificifically, the thesis describes a SR QPSK transceiver and a SR M-PSK transceiver. These transceivers make use of a digital phase detection technique that is very simple. In order to confirm the viability of the proposed idea, some implementations in the HF band operating at a symbol rate of 10 kHz were developed. Regarding frequency modulations, we present a SR receiver detection method suitable for the narrowband case. This method is based on the observation of the instantaneous phase once per symbol, so that we are able to detect the received frequency through the value of the detected phase. For this case two implementations are presented: a SR receiver for Sunde¿s FSK modulation, and a SR receiver for MSK modulation.
By using the designed SR receiver for the MSK modulations as a starting point, a SR MSK transceiver compatible with the IEEE 802.15.4 standard is implemented. This standard defines the physical layer and the medium access control (MAC) layer used for low speed wireless personal area network, a field in which the SR receiver fits perfectly.
Finally, we describe a synchronization method for SR MSK receivers at the symbol, chip and frame levels. This method is presented in a general way and it is able to sinchronize through any preamble satisfying some specific requirements.
In particular, we describe an implementation that aims to synchronize IEEE 802.15.4 standard frames.
Simplicity has been prioritized in all the presented designs and implementations in order to potentiate the characteristic low cost and low power consumption features of the SR receiver. Likewise, we prove that this kind of receiver is especially efficient in the detection of phase and narrowband frequency modulations.
