Abstract: A system to repeat MIMO signals in a network by orthogonally polarizing the signals and maintaining the orthogonal polarization.

Abstract: The system and method uses a one or more pilot beacons to more accurately locate the position of an indoor mobile device. Modulation and level control of the co-pilot beacons provides a third dimension, z-axis, of positioning. An augmented Position Determining Entity (“aPDE”) can be used which does not modify the existing PDE in the network, and facilitates and ensures high-integrity information during a 2D to 3D positioning upgrade.

Abstract: A system of and method of accurate positioning of a wireless handset combines a positioning signal with the communication signal. For locations where a wireless handset cannot receive an adequate signal, the system receives a carrier signal either through a donor antenna, exterior the building, or a base station connected to the carrier. In addition to a communication signal, the system adds a location signal to assist the wireless handset in determining the wireless handset's location. The power level of the location signal, a pilot beacon signal, is adjusted so to be sufficiently strong but not at a level that will cause interference with the communication signal. The pilot beacon signal uses a different path than the communication signal to minimize delays. In addition, the system adjusts the offset, either positively or negatively, to account for timing delays caused by hardware and cables. The pilot beacon signal has multiple channels so that each repeating antenna has a distinct pilot beacon signal.

Abstract: A system and method for detecting antenna coupling and for providing feedback cancellation in response to the antenna coupling includes a signal feedback cancellation circuit configured to be coupled between a signal receiver and a signal transmitter. The feedback cancellation circuit is responsive to received signals, amplified signals and the detection of signal coupling between a receiving antenna any transmitting antenna, for providing a feedback cancellation signal to a signal amplifier. The feedback cancellation circuit may employ time domain or frequency domain methods. In the case of a time domain method, the feedback cancellation circuit may further include a White noise generator which serves to the tune or adjust the feedback cancellation circuit.

Abstract: A method for controlling an adjustable gain in an amplifier having an output power level and an adjustable gain is disclosed. The method includes an enhancement to a conventional Automatic Gain Control (AGC) function that distinguishes between a signal caused by oscillation and a signal that actually appears in the amplifier's passband. The method also controls unwanted and out of control amplifier oscillation using an iterative correlation process. The method prevents gain “hunting” if the output signal level is near the “set point” of the maximum permitted output level by implementing some degree of Hysteresis. The correlation process is performed by tracking a specified number of alternating gain increase/decrease cycles. If in any cycle the gain is not changed, or is changed in the same direction as in the previous cycle, the correlator is reset and the process begins again.