Abstract: A programmable band-pass filter in a radio-frequency receiver. The band-pass filter has a bandwidth substantially covering a channel bandwidth. Once the appropriate channel in use is determined, the frequency band of the band-width filter is set to correspond to it.

Abstract: A cordless telephone system employing a base station (202) as slave and a plurality of handsets (204a, 204b) as masters is provided. The handsets (204a, 204b) periodically poll the base station. The base station (202) responds with acknowledge slots and also timing information whereby the handsets (204a, 204b) can adjust their poll timing so as avoid interfering with one another. If an active connection is set up between the base station (202) and a handset (204a), the other handset (204b) is not allowed to poll during the connection, effectively functioning as a system slave for the duration of the connection. Thus, the second handset (204b) stays synchronized to the first handset (204a) and listens until the connection is completed, whereupon it resumes normal functioning.

Abstract: A frequency hopping spread spectrum telecommunication system is provided, which selects carrier frequencies based on the number of active slots. The duration that carriers have been employed is then based on the number of active slots (401, 402), rather than the number of frames (22). Thus, non-interfered with carriers can be used more often than interfered with carriers, thereby improving voice quality.

Abstract: A cordless communication system for use in a wireless network that is capable of providing efficient use of available frequency spectrum within a given physical space is disclosed. The cordless communication system is comprised of a central unit and at least two remote units that are capable of direct communication with each other via wireless connections assigned and coordinated by the central unit.

Abstract: A base station (12) according to an implementation of the invention is adapted to identify a public power supply frequency, e.g., 50 Hz or 60 Hz. The base station (12) then adapts its frame and slot structures to the power supply frequency. The base station (12) transmits a synchronization word on a data channel, and also transmits a signal indicative of the power supply frequency. The mobile unit (14, 16) receives the data channel and the information indicative of the frequency. The mobile unit (14, 16) then adapts its frame and slot structure appropriately. After the link is established, and if periodic interference is detected, transmission occurs during the inactive period of the interference.

Abstract: A frequency hopping cordless telephone system is provided, including a base station and one or more mobile units. The base station and mobile units are adapted to determine if a carrier frequency has been interfered with. If so, and if a next frame has slots available, the lost slot(s) are resent, along with those next in queue. A ring buffer memory is provided to receive both the resent slot(s) and the current one. The slots are read into the memory at a first rate and read out at a higher rate.

Abstract: A method and system are provided for wireless communication. A base unit and a mobile unit are provided which are operable to communicate over an air interface having a plurality of channels. The method and system further include transmitting from the mobile unit a message on a selected channel for a first predetermined time. The channels are scanned at the base unit. Also, the message is detected at the base unit on the selected channel and the selected channel is used as an initial channel for a wireless communication link between the mobile unit and the base unit.

Abstract: A method for avoiding interference in a wireless telecommunication system is provided. The method includes providing communication between a first and second component at an initial frequency. A plurality of successive line quality indicators is determined at a line quality monitor of the first component. Consecutive line quality indicators are summed over a predetermined time to determine a slow hop count. A determination is made as to whether the slow hop count is greater than a slow hop threshold. A determination is made as to whether to provide communication with the first component at a second frequency when the slow hop count is greater than the slow hop threshold. This determination is based on a power level of the second component and a communication strength received from the second component at the first component. A signal is communicated from the first component to the second component requesting the second component to provide communication at the second frequency.

Abstract: The present invention comprises a system for mobile communications. The system comprises a base station (12) having logic for evaluating parameters relating to the quality of individual communication links (14a-17a) between the base station (12) and each of a plurality of mobile units and selecting those parameters that optimize the quality of the communication link (14-17) for each individual mobile unit. The system also comprises circuitry residing in each mobile unit for establishing an optimized communication link (14-17) with the base station (12). In accordance with another aspect of the present invention, a method is disclosed for mobile communications comprising three steps. In step one, parameters representative of transmission quality for individual communication links (14a-17a) between a base station (12) and each of the plurality of mobile units are monitored.

Abstract: A method and system are disclosed for shifting frequency subsets to avoid base station interference in a frequency hopping cordless telephone system. A base station communicates with the handsets using frequencies selected from active frequency subsets. Frequency subsets are shifted to avoid interference by selecting frequencies initially from a defined number of active frequency subsets where each of the active frequency subsets is used before repeating an active frequency subset. The number of active frequency subsets is then changed for a defined period of time to change the period with which the active frequency subsets are used. After the defined period of time, the number of active frequency subsets is returned to the defined number of active frequency subsets.