Using Signal Source and Receiver to Build Space Diversity Simulation Experiment System

Scheme Overview

In a wireless communication system, due to the existence of multi-channel paths, a wireless signal reaches a receiver through more than two paths. When the multipath signal arrives at the receiver, the signal is synthesized, and the synthesized signal is enhanced or faded, which has a great influence on the communication quality. Space diversity is one of the methods to solve the signal multipath problem. How to simulate the space diversity multipath effect experiment in the laboratory? More than two signal sources and receivers can be used to simulate the simulation.

In order to completely simulate the multipath signal effect experiment for space diversity test, two kinds of experimental systems are required, as shown in the following figure: Figure 1 requires a signal generator, a channel simulator and two receivers to simulate the multipath scene of receiver diversity test. Figure 2 requires two signal generators, a channel simulator and a receiver to simulate the transmit space diversity test. In order to accurately simulate the multipath effect, the baseband of the two signal generators must be synchronized and the phases of the two carriers must be consistent. Therefore, the baseband data of the two signal sources are consistent. Use a unified frequency reference to ensure phase consistency and a unified trigger source to ensure time synchronization, also note that the coaxial cable length of the reference clock is consistent, and the cable length of the trigger source is consistent.

Application Scenarios

Signal

Fig.1 Block diagram of receiver diversity test experiment

Signal

Fig.2 Block diagram of transmitter diversity test experiment

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