Study of hybrid permutation frequency phase modulation.

Abstract

In future communication applications, it is desirable to provide good system performance and more services to a number of users using the minimum resources. These expectations pose challenges in the design of modulation and coding. This thesis presents and studies the hybrid permutation frequency phase modulation (HPM) communication systems. By combining FSK and PSK, the signal energy per symbol is increased. Applying this type of signals to permutation modulation, the concept of HPM is presented and its signal properties have been mathematically analyzed. The expression for bandwidth efficiency is derived. The performance of transmission systems is related with channel characteristics. The behavior of HPM is appraised in the case of AWGN and frequency selective fading channels. The coherent and noncoherent detection have been considered respectively. Our performance analysis are based on the measures of bit error performance and bandwidth efficiency. It is shown that a large set of waveforms can be easily obtained in HPM. For uncoded HPM, most of the possible waveforms are used, and the system power and bandwidth efficiency can be greatly improved in AWGN channels. The nature of permutation modulation indicates an implicit diversity in frequency selective fading channels. By using a small portion of waveforms, which leads to coded HPM, the effective diversity increases. The rule of selecting waveforms is worth studying. We propose t-designs as the candidate. The results show that coded HPM is a power efficient scheme and is robust in fading environments.