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Improved Measurement Schemes for FDD Wireless Communication System

In the research of wireless communication technology, network planning and optimization, wireless system performance measurement is indispensable. Due to the interference of uplink and downlink signals in the same frequency range in the process of simultaneous channel and quality of service (QoS) measurement in FDD wireless communication system, it is necessary to design and improve the measurement system based on the existing widely-used measurement scheme. In this paper, two improved measurement schemes for FDD wireless communication system are proposed. The traditional measurement scheme is presented, and the uplink and downlink signal interference introducing by the mobile terminal can be discovered by the simultaneous measurement of channel and QoS parameters. The improved measurement schemes are then proposed by using power spilt, isolator, circulator or band pass filter in the structures. It is found that the influence of uplink signal on the network scanner can be effectively isolated in the improved schemes.