Systems, methods, and devices are provided for correcting compression distortion of wireless signals due to variations in operation parameters of the radio frequency system. The method may include using circuitry to generate a reference signal that is not pre-distorted by a processing block. The method may involve receiving an envelope signal representative of a signal being transmitted by a transceiver. The method may also involve determining a first peak-to-average ratio of the envelope signal and receiving a second peak-to-average ratio of the reference signal. The method may additionally involve determining a difference between the first peak-to-average ratio and the second peak-to-average ratio. The method may also include adjusting a gain of an amplifier of the transceiver based on the difference.

The invention relates to wireless repeater systems and methods. In embodiments, such systems and methods involve receiving a wireless transmission signal; and processing the wireless transmission signal using a digital signal processing facility (DSP); wherein the DSP is adapted to filter at least one sub-band of the wireless transmission signal using a digital bandpass filter.

Mitigation of satellite interference is contemplated. The mitigation may include processing satellite transmissions to remove interferences based on an amount of signal overlap, such as to facilitate mitigating interferences resulting from satellite spacing and/or ground antenna dish size.

A device may receive a reference signal identifying a radio signal provided to a radio unit associated with a user equipment located substantially near an earth station and identifying a user equipment signal generated by the user equipment. The device may receive an earth station target signal generated by the earth station and a parasitic signal. The device may generate a noise cancellation signal based on the reference signal, the earth station target signal, and the parasitic signal. The device may cause the noise cancellation signal to be applied by the earth station to eliminate the parasitic signal.

Provided is a method of operating a repeater operating in a time division duplex (TDD) mode which comprises detecting a synchronization signal from a received signal, determining a type of a communication period based on the detected synchronization signal and controlling an operation of a signal linearizer based on the determined type of the communication period.

A relay station comprises antennas, wireless devices corresponding to the antennas, and a controller to control an operation of the wireless devices. Each of the wireless devices includes a receiver to convert the first radio signal received by a corresponding antenna into a baseband signal, an FIR filter to assign a delay to the baseband signal; and a transmitter to convert a signal output from the FIR filter into a second radio signal transmitted from the corresponding antenna to the reception station. The controller sets a different delay amount in the FIR filter in each of the wireless devices so that the FIR filter assigns a delay, which is different from among the antennas, to the baseband signal input from the receiver in each of the wireless devices.

A first relay station capable of performing, together with a second relay station, a non-replay relay for a first radio signal transmitted from a transmitting station for a receiving station having one antenna includes an antenna, a radio and a controller. The radio includes a receiver that converts the first radio signal into a baseband signal, an FIR filter that adds a delay to the baseband signal, and a transmitter that converts the signal output from the FIR filter into a second radio signal transmitted from the antenna to the receiving station. The controller ensures that the second radio signals transmitted from the respective antennas of the first and second relay stations have different delays, and that the FIR filter The delay is set in the FIR filter.

Methods and apparatus for implementing a repeater are described. In various embodiments the repeater determines uplink/downlink timing information either from information broadcast from a base station or from monitoring received signals and/or gaps between received signals. In various embodiments while the repeater may decode control information to determine uplink/downlink time periods, user data is not decoded and re-encoded. In various embodiments interference between uplink and downlink circuitry is reduced or minimized by controlling gains, combining weights and/or power to amplifiers in the repeater based on the mode of operation. A stored information can include sets of different weights and/or parameters for the mode of operation and/or beam forming antenna pattern in use at a given time.

A technology is described for feedback cancellation in a multiband booster. The repeater can comprise: a server antenna port; a donor antenna port; a first direction amplification and filtering path coupled between the server antenna port and the donor antenna port; a second direction amplification and filtering path coupled between the server antenna port and the donor antenna port; a first-direction two-antenna feedback cancellation circuit coupled between the server antenna port and the donor antenna port to reduce antenna-to-antenna feedback for a single band in a first direction between a donor antenna and a server antenna; and a second-direction two-antenna feedback cancellation circuit coupled between the server antenna port and the donor antenna port to reduce antenna-to-antenna feedback for the single band in a second direction between the donor antenna and the server antenna.

A technology is described for feedback cancellation in a multiband booster. The repeater can comprise: a server antenna port; a donor antenna port; a first direction amplification and filtering path coupled between the server antenna port and the donor antenna port; a second direction amplification and filtering path coupled between the server antenna port and the donor antenna port; a first-direction two-antenna feedback cancellation circuit coupled between the server antenna port and the donor antenna port to reduce antenna-to-antenna feedback for a single band in a first direction between a donor antenna and a server antenna; and a second-direction two-antenna feedback cancellation circuit coupled between the server antenna port and the donor antenna port to reduce antenna-to-antenna feedback for the single band in a second direction between the donor antenna and the server antenna.