A transmission power control in a wireless communication, in that based upon transmission power designation information "A" functioning as a power control target derived from a transmission power designating unit 16, a transmission power error "E" is detected from a difference between a detection value "D" of an outputted transmission signal and a power control target value "C". This transmission power error "E" is multiplied by a loop gain "G" of a feedback loop set by a loop gain setting unit 22 so as to produce a feedback correction value "F". The transmission power control is carried out based on the feedback correction value "F". Furthermore, a suitable bias voltage "J" is outputted from a bias voltage producing unit 17 in response to the transmission power designation information "A" so as to reduce power consumption, and also, a gain variation of a power amplifier 13, which is caused by this bias current control, is compensated by a gain variation compensating unit 26 in response to the transmission power designation information "A".
A flexible amplification system for wireless data networks is disclosed. The amplification system may be powered from multiple sources including power over Ethernet, obviating the need for independent data and power cables. The amplification system may be digitally controlled to optimize bi-directional transmit and receive capabilities and to produce a constant output.
A method and system is provided for coordinating radio resources in shared or unlicensed frequency bands. Specifically, a set of operating parameters and a receiver-transmitter feedback mechanism are provided that govern the coordination of radio spectrum usage by a plurality of wireless devices. This is achieved by rewarding good receivers and transmitter behavior and/or restricting radio spectrum occupation time. The set of operating parameters include the transmission power, spectrum access probability, spectrum occupation time, and a Receiver Success Rate (RSR).
A wireless transmitter has: a calculation means for determining an electric power value of baseband signals to be input to modulating means; a detection means for determining a transmitting electric power value after detecting a transmitting electric power of an antenna; a generation means for generating target gains of a plurality of variable gain amplifying means; and a control means for determining observation gains from the electric power value and the transmitting electric power value to control the gains of the plurality of variable gain amplifying means in such that the observation gains come to be the target gains.
A frequency tracking circuit and method comprising a master crystal oscillator circuit is used for frequency tracking between a handset and a base station comprising a calibration subsystem for taking a temperature measurement, a reference control circuit for determining a numerical value needed to align a handset frequency with a base station frequency, an adder for adding the numerical value to a previous numerical value determined by the reference control circuit, a latch for latching the output of the adder, and a low precision master crystal oscillator for clocking the frequency of the latch. The most significant bit from the latch is input into a phase/frequency detector for forcing a voltage controlled oscillator to track a desired frequency.
A WLAN (Wireless Local Area Network) transmission technique is provided where data is transmitted in two or more different transmission modes at different transmission rates. A transmission gain is determined to be applied when transmitting data. The transmission gain is determined to be transmission mode dependent such that the transmission gain in a first transmission mode is greater than the transmission gain in a second transmission mode if the transmission rate in the first transmission mode is lower than the transmission rate in the second transmission mode.
