Patent ID: 9450800
Filing Date: 2016-09-20
CPC Classification: H04L,H04W

Claim Text:
1. A wireless transmitter for performing data transmission by using OFDM in an operating frequency band in which a transmission spectrum mask regulation is strict, the wireless transmitter comprising: an RF circuit characteristic analysis unit which analyzes spectrum characteristics in a use frequency band that are included in RF circuit characteristics of a radio frequency conversion unit of the wireless transmitter; a multipath delay detection unit which detects a degree of signal attenuation according to a multipath delay in a communication environment of the wireless transmitter, and which detects a degree of signal attenuation according to a distance in the communication environment of the wireless transmitter; a transmission power setting unit which sets a desired transmission power of the wireless transmitter; a digital filter setting unit which sets characteristics of a digital transmission filter of a baseband of the wireless transmitter; a windowing function and windowing duration selection unit which selects a windowing function and a windowing duration used in windowing to be executed in OFDM symbols based on each system parameter including: (i) the RF circuit characteristics of the wireless transmitter analyzed by the RF circuit characteristic analysis unit, (ii) the degree of signal attenuation according to the multipath delay and the degree of signal attenuation according to the distance detected by the multipath delay detection unit, (iii) the desired transmission power set by the transmission power setting unit, and (iv) the characteristics of the digital transmission filter of the baseband set by the digital filter setting unit; a guard interval duration selection unit which selects a guard interval duration to be added to the OFDM symbols; and a transmission power selection unit which selects a transmission power of the OFDM symbols.