Abstract: A wireless communication device includes a first radio frequency (RF) transceiver configured to transmit/receive RF signals in a first frequency band, a second RF transceiver configured to transmit/receive RF signals in a second frequency band that may be different from the first frequency band, and a connection manager that is coupled to the first and second RF transceivers and that assists with channel selection by the first and second RF transceivers to reduce mutual interference between the first and second RF transceivers. Related methods are also disclosed.

Abstract: A wireless communication device includes a first radio frequency (RF) transceiver configured to transmit/receive RF signals in a first frequency band, a second RF transceiver configured to transmit/receive RF signals in a second frequency band that may be different from the first frequency band, and a connection manager that is coupled to the first and second RF transceivers and that assists with channel selection by the first and second RF transceivers to reduce mutual interference between the first and second RF transceivers. Related methods are also disclosed.

Abstract: A spread spectrum system may include a transmitter and a receiver. The transmitter is configured to transmit a signal having at least one channel, where the signal may include a reference signal, an information signal and a frequency offset between the reference signal and the information signal. The receiver may receive the transmitted signal from the transmitter and mix the received signal in order to retrieve the information signal from the received signal. This allows the receiver to operate at low power (e.g., 10 uW-100 uW).

Abstract: The present invention relates to a random access process in a cellular communications system and to a user equipment (UE) and a NodeB adapted for performing the process. A problem with the random access is that the time slot for receiving a random access request (RA-request) has a long unused guard portion. When the UE transmits the RA-request, the distance to the receiving NodeB is unknown, and the purpose of the guard portion is to accommodate for propagation delay. The disadvantage is the inefficient use of the random access channel which results in long delays for UEs to access the network. The present invention solves the problem with a method in which the UE position is determined and the distance and propagation delay between the UE and NodeB is calculated before the transmission of the RA-request, and the timing of the transmission is advanced by the propagation delay.

Abstract: Methods and apparatus for performing synchronization and DC-offset compensation in FM transmission systems significantly reduce the overhead associated with transmitting a conventional digital preamble at the start of each of a succession of transmitted digital data packets. According to exemplary embodiments, a multi-part digital preamble includes a short, substantially DC-free leading part followed by a code-protected synchronization part which is not necessarily substantially DC-free. The leading part provides for coarse DC offset estimation and synchronization, while the coded synchronization part carries timing and/or other useful information which can be unique for each packet. One or more substantially DC-free trailing parts follow the synchronization part, or are included in the synchronization part itself, and provide for fine tuning of the DC-offset estimate.

Abstract: An uncoordinated frequency hopping cellular system includes a mobile unit and a number of base stations. The mobile unit determines information pertaining to a set of base stations that are within a geographical region defined by a location of the mobile unit, and supplies, to at least one of the base stations in the set, the information pertaining to at least one other base station in the set. The information may include address information corresponding to the set of base stations, and may include clock offset information representing a difference between a clock value associated with said at least one of the base stations and a clock value associated with at least one of the other base stations in the set. As different mobile units supply information to the base station, the base station accumulates information about other base stations in the system. The base station supplies this accumulated information to mobile units, so that they may readily have information (e.g.

Abstract: A secure radio personal communication system and method includes a base station which relays cellular verification signals between a wide area cellular network and a cellular terminal via the wire telephone network. Thus, cellular telephone calls which are routed to a cellular terminal via a base station, when the cellular terminal is within a local region covered by the base station, may be exchanged between the cellular network and cellular terminal over the wire telephone network. Calls from the wide area cellular network which are routed through the base station can thus employ the same security systems and methods which are employed by the wide area cellular network. Signals between the base station and the cellular terminal are preferably exchanged when the cellular terminal is parked in the base station. Verification and encryption signals may be exchanged.

Abstract: A cellular communications channel is allocated for communication between a cellular terminal and a telephone base station wherein the telephone base station connects a wire telephone network to the cellular terminal within a local region in a cell of a wide area cellular network which uses a plurality of control channels and communications channels within a cellular network spectrum, by controlling the cellular terminal to measure the received signal strengths of the control and communications channels. The cellular terminal is controlled to measure received signal strengths of the control channels. A set of communications channels associated with measured control channel having lowest received signal strength is identified. The cellular terminal is then caused to measure the received signal strengths of the set of communications channels. A communications channel having the lowest received signal strength is selected from the set of communications channels.

Abstract: A secure radio personal communication system and method includes a base station which relays cellular verification signals between a wide area cellular network and a cellular terminal via the wire telephone network. Thus, cellular telephone calls which are routed to a cellular terminal via a base station, when the cellular terminal is within a local region covered by the base station, may be exchanged between the cellular network and cellular terminal over the wire telephone network. Calls from the wide area cellular network which are routed through the base station can thus employ the same security systems and methods which are employed by the wide area cellular network. Signals between the base station and the cellular terminal are preferably exchanged when the cellular terminal is parked in the base station. Verification and encryption signals may be exchanged.

Abstract: A telephone base station allows a wire telephone network to be accessed by multiple cellular terminals within the local region of the base station. The users are generally members of a specified group such as a family or business. The base station is connected to the wire telephone network by a single line so that the radio transceiver of the base station communicates with the multiple cellular terminals serially. Each of the cellular terminals is authenticated upon entry of the local area. During communication with a given terminal, the remaining terminals in the local area are prevented from accessing the base station. Upon receipt of an incoming call, a message is transmitted to the caller to identify the desired cellular terminal. The base station then communicates with the identified cellular terminal and prevents access by the remaining terminals.