Based The Auxiliary Band Synergistic Multiplexed Communication

Cooperative communication technology is a kind of technology which equipment multiple antenna but can realize the functions of performance virtual multiple antenna transmission technology. This technology can provide multiplexing gain to the communication system, multiplexing gain is also called "degree of freedom (d.o.f.)". Research shows a law that the higher the cooperative communication system's the d.o.f and the higher the utilization rate of spectrum. But there is a "freedom of the bottleneck problem" that limit the capacity of systerm. The degree of freedom bottleneck problem is this problem that in the uplink wireless network communication, with the increase of the SNR, source to relay and the base station of the cut's increasing degrees of freedom is less than the source and relay to the base station of the cut's increasing rate of degrees of freedom, and the system of the degrees of freedom depends on the minimum of two cuts, the minimum value (bottleneck) limit the largest rate of the system, reducing the performance of the system.In order to solve the above "freedom bottleneck problems", this article refered to a large number of documents and compared existing solutions, put forward the improvement of mehtods based on the auxiliary band model, and using the cooperative multiplexing gain (CMG) to measure, research, verify the scheme of the system performance. The paper mainly work are as follows:1. A deep research on what is the bottleneck problem of the degrees of freedom, using the equation to intuitive show the problems, and analysis of the current experts and scholars in the bottleneck problem of freedom proposed based on the synergy of auxiliary band communication technology solutions, and verify the correctness of the scheme. This paper is the basis work.2. Improving the system model and the transmission channel model plan.(1) The channel model improvement:based on auxiliary band in communication system model, the source node to relay nodes between channel decline model for Rayleigh fading, assuming that source node and relay node of the distance between the not long, use more tend to be realistic conditions of Rice model.(2) Transmission process improvement:the unit transport process time will be divided into two parts. In T time, mobile terminal to relay and send data base station; In (1-T) time, mobile terminal to cease to relay transmission and the mobile terminal and relay together to send data base station and mobile terminal.3. Using the matalab simulation software to verified the results. Using matlab simulation software to put forward the improvement scheme for the correctness verification, the improvement ideas put forward in this paper to the simulation test.Information theory analysis and simulation results show that based on the synergy of auxiliary band communication solution that can help improve improve system channel capacity. And the proposed improved based on the communication frequency band with auxiliary plan can further improve the system performance. And the traditional cooperation communication and has put forward the auxiliary band compared to the scheme, the improvement methods to improve reuse gain can be seen as a high or low range of SNR can get a higher transmission rate.