Research Of Resource Allocation Algorithm For Hybrid Carrier System Based On WFRFT

In recent years, as the science and technology evolve rapidly, people’s demand for communication service is no longer limited to the original voice and text transmission, the demand for abundant multimedia and Internet big data business is growing. And as the diversification of communication system’s application scenarios and the saturation of wireless communication resources, it needs to have a higher demand on the current communication technology, such as new carrier modulation system and adaptive resource allocation technology are gradually into the research field of people’s vision, in order to overcome the complex channel environment, enhance the overall performance of the communication system, increase the spectrum efficiency of wireless resources.The main research scenario in this paper is the time-frequency doubly selective channel in high-speed mobile environment, including the time dispersion caused by multipath interference and the frequency dispersion caused by doppler shift, the ISI/ICI(Intel Symbol Interference/Intel Carrier Interference) caused by the doubly dispersive characteristics will seriously affect the performance of traditional OFDM, SC-FDE, the hybrid carrier modulation system based on switch, and the traditional carrier system can only provide two forms of transmission signal in time and frequency domain, can’t guarantee the best adaptive to the time-varying channel environment. So the main research object in this paper is a new carrier system based on Weighted-type Fractional Fourier Transform( WFRFT)-- Hybrid Carrier Modulation(HCM)system, which is committed to mix the traditional SC and OFDM signal together by a weighted way, which makes the signal show better performance than the traditional carrier system in the time-frequency doubly selective channel based on Jakes model, and have a better ability to resist the time-frequency doubly dispersive fading. At the same time, it will also deeply discuss how to obtain the optimal order of hybrid carrier system in the various application scenarios, namely seeking the most suitable transmission signal under the given channel condition.In order to satisfy people’s increasing business demand, mobile communication constantly promote and expand, result in the increasingly tense condition of wireless communication resources, so another research emphasis in this paper is how to reasonably allocate and use wireless resources. The current study of resources allocation for OFDM system has been relatively mature, but not for hybrid carrier system, therefore, to allocate resources for hybrid carrier system in a similar distribution theory as for OFDM system and thus to increase the spectrum efficiency of wireless resources, which is the main research direction in this paper. In the practical communication systems, resource allocation can be divided into subcarrier, bit, power allocation. This paper will focus on the bit and power allocation problem of practical single user, and the research field will expand from traditional distribution in frequency domain to distribution in fractional domain.