Weighted open loop power control transmitter cross reference to related applications
View Patent ↗A weighted open loop power control transmitter for controlling transmission power levels using a spread spectrum time division duplex (TDD) technique having frames with timeslots for communication includes a demodulator configured to receive a transmitted signal from the receiver, a channel estimation device, a data estimation device, and a weighted open loop power controller. The weighted open loop power controller includes a power measurement device, a pathloss estimation device configured to receive an interpreted power level from the data estimation device and estimate the pathloss and update a long term average of the pathloss, a quality measurement device, and a transmit power calculation device for determining the transmitter's power level and to control the receiver's amplifier.
1. A weighted open loop power control transmitter for controlling transmission power levels using a spread spectrum time division duplex (TDD) technique having frames with timeslots for communication, the transmitter comprising:
a demodulator configured to receive the transmitted modulated communication burst and generate a baseband signal;
a channel estimation device configured to receive the baseband signal and extract channel information from the baseband signal;
a data estimation device configured to interpret the power level of the communication burst;
a weighted open loop power controller, the weighted open loop power controller comprising: a power measurement device configured to receive the extracted channel information from the channel estimation device, a pathloss estimation device configured to receive the interpreted power level from the data estimation device and estimate the pathloss (L) and update a long term average of the pathloss (L 0 ) between a receiver and the transmitter, a quality measurement device configured to determine the quality of the estimated pathloss and weight the estimated pathloss by a weighting factor (α), and a transmit power calculation device, wherein the transmit power calculation device is configured to determine the transmitter's power level and to control the receiver's amplifier.
2. The transmitter of claim 1 , wherein the transmit power calculation device determines the transmitter's power level by adding a desired receiver power level to a(L−L 0 ) to L 0 to a constant value.