Lately, a need for high data transmission rate is on the increase with the trend of large-capacity wireless communication services. The Long Term Evolution (LTE) that is to be used by mobile carriers around the world meets this need as a wireless communication standard. The data communication rate of this communication system is higher than that of 3G/3.5G (such as W-CDMA) with low delay. With its superior radio wave use efficiency, this communication system is expected to spread rapidly. However, if noise of an LTE compatible terminal interferes with the wireless communication band, communication quality in throughput or receiving sensitivity will be degraded. To solve this problem, noise suppression technology (intra-system EMC) is important.