Control of transmitter peak power and duty ratio in a wireless system to maintain average transmitter power and increase communication range

A wireless system comprising:

• a base station and a terminal station,
• wherein the base station comprises
• a modulator which modulates a carrier to produce a modulated carrier;
• a signal generator which generates an output signal possessing an average transmission power not greater than a predetermined value by controlling a peak value and a duty ratio of the modulated carrier simultaneously;
• a transmitting unit which transmits the output signal generated;
• and
• a controller which controls the peak value and the duty ratio, in terms of a power of a reflected wave which is generated when the transmission power transmitted by the base station is reradiated by the terminal station;
• wherein both data transmission and power transmission between the base station and the terminal station are performed using a same carrier waveform,
• wherein the controller controls the peak value of the transmission output received by the terminal station to constantly exceed a threshold value of a rectifying element of the terminal station,
• wherein the wireless system employs an electromagnetic wave propagating space as a communication medium, and performs a waveform-equalized intermittent transmission between the base station and the terminal station,
• wherein the controller controls the peak value and the duty ratio using a frequency spectrum of an electromagnetic wave which is reradiated from the terminal station, and of which the reradiated frequency spectrum possesses a frequency component not included in a frequency spectrum of the transmission power of the base station,
• wherein the base station further comprises a detector configured to detect the reradiated frequency spectrum of the electromagnetic wave from the terminal station, and of which the reradiated frequency spectrum possesses a frequency component not included in the frequency spectrum of transmission power of the base station,
• wherein the controller increases the peak value of the transmission power and decreases the duty ratio of the intermittent transmission, when the frequency spectrum is not detected, if an average power value of the transmission power remains within a predetermined value range,
• wherein the wireless system further comprises an equalizing base station antenna and a terminal station antenna, and
• wherein a transmitted wave from the base station to the terminal station is transmitted by the equalizing base station antenna which produces, in advance, a distortion of an inverse characteristic to a distortion that the terminal station antenna produces.