Abstract: A method and apparatus for improving throughput in a wireless local area (WLAN), which includes buffering a set of messages, identifying a target address for the set of messages, and concatenating the set of messages based on the target address. The target address can be either unicast, broadcast, multicast or combination of unicast, broadcast and multicast as described herein.

Abstract: In one embodiment of the present invention, an access point (111) receives a multicast packet intended for a particular multicast group. Upon receipt, the access point only rebroadcast the multicast packet over a wireless segment if it determines that there is at least one wireless subscriber unit (131) belonging to the particular multicast group and associated with the access point that did not originate the multicast packet. Optionally, if the multicast packet signals an automatic rebroadcast of the multicast packet over the wireless segment, the access point automatically rebroadcasts the multicast packet without determining whether there is at least one wireless subscriber unit belonging to the particular multicast group and associated with the access point that did not originate the multicast packet.

Abstract: In a first embodiment, an infrastructure device (106) receives a message identifying a source station address (102) and a destination station address (104). The infrastructure device transmits an acknowledgement message to the source station address within a first time period, and transmits the message to the destination station address only if an acknowledgement message was not transmitted by the destination station within a second time period. In a second embodiment, if the message has a designated bit set, the infrastructure device discards the message, and the destination device transmits an acknowledgement message to the source station within the first time period.

Abstract: A one-to-many dispatch method for use in a TDMA or other wireless telephone system. The one-to-many dispatch call is placed by sending a Request message 204 from a Personal Station PS 112 to a Control Center Station (CS) 120 which assigns a channel with an Assignment message 208. The PS 112 sends a call setup message over the control channel resulting in a channel assign message 242 being broadcast repeatedly. Call connect messages over the Assigned Channel AC 244 are also repeated from the CS 120 to indicate the open connection. A hang timer is started when the PS 112 ceases transmission of voice and the connection is torn down upon expiry of the hang timer unless another PS transmits a call setup message 234 on the Assigned Channel AC before the expiry of the hang timer.

Abstract: An apparatus and method adaptable to desired offsets for determining an undesired offset of a signal having a maximum and a minimum state that includes: providing a peak and trough estimate of, respectively, the maximum and minimum amplitude state; averaging such estimates to provide a reference level that is proportional to the undesired offset; and controlling the peak and trough estimates whenever a comparison of the signal and the reference level is, respectively, indicative of the maximum and minimum amplitude states to thus assure adaptation to the desired offset of the signal.

Abstract: A dual function interface operating in a Personal Computer Memory Card International Association (PCMCIA) mode of operation switches to an alternative interface operating in the appropriate mode of operation as defined by the alternative interface system specification. This is accomplished by setting a unique combination of address lines (203) and/or control lines (202) and automatically and transparently switching from the PCMCIA mode of operation to the alternate mode operation in response to the unique combination.

Abstract: An apparatus is disclosed which is adaptable for indicating communication failures and eliminating an undesired pattern of physical values of a generated signal, the signal having physical values responsive to a sequence of information. The apparatus includes a protocol sequencer, responsive to the sequence of information and to the communication failure indications, and providing RESET and RETRY control signals; a framing flag generator, responsive to the RESET signal and providing a variable length framing flag, the length of the framing flag being dependent on the RETRY signal; a multiplex switch, responsive to the RETRY and RESET signals for generating a concatenation of the framing flag and sequence of information; a whitener generator, responsive to the RESET signal, for providing a known sequence of values; and a multiplier, for multiplying said concatenation of said framing flag and the sequence of information with the known sequence of whitener values.

Abstract: An apparatus is provided for generating a multiple-level amplitude modulated data signal. The circuit provides accurate data signal level control while minimizing transient errors. A controlling level, relative to an analog reference level is provided. Multiple bit reference levels are generated from the controlling level and analog reference level. A method is provided for selecting one of the reference levels.

Abstract: A wireless communications receiver having an adaptive squelch system and operable in multiple states including a receiver (11) that provides a received signal when operating in a clear (unscrambled) state and when operating in a secure (scrambled) state; a squelch function (13) that generates an unsquelch signal when the received signal satisfies a quality level; and a controller (15) that sets the quality level to a predetermined level that corresponds to the receiver operating state.

Abstract: A resilient housing actuated multi-level housing switch comprises a compression sensitive circuit which is actuated by compressing a resilient housing. The compression sensitive circuit comprises a compression sensing device which produces an analog signal, an A to D converter, and a microprocessor. The microprocessor is programmed with algorithms to control the power levels of communication equipment and volume levels based on signals produced by compressing the compression sensing device.

Abstract: Disclosed is a signalling system wherein a private call initiating trunked subscriber enters a private ID number on an entry means. The trunked subscriber unit decodes the entered number and forms the ID code required to request a channel. The central controller receives the request and encodes an appropriate channel grant for a trunked private call. In another aspect of the present invention, the called subscriber unit may decode and display the ID of the calling subscriber.

Abstract: An apparatus and method for determining the period and frequency of a signal intefering with a desired Loran C signal are provided. A sample of the interfering signal is generated at a time corresponding to the peak of the autocorrelation function of the interfering signal with respect to the predetermined pulse tracking reference point of the Loran C signal. Indicia of the period and frequency of the interferer is obtained from the timing of the sample generated at the autocorrelation function peak.

Abstract: A method and apparatus for attenuating an interfering signal corrupting a desired Loran C signal is provided. An interfering signal sample is determined which occurs at the peak of the autocorrelation function of the interfering signal such that the period of the interferer is known. The sample occurring at the peak of the autocorrelation function is added to or subtracted from the desired Loran C signal sample taken at a predetermined reference point during the pulses thereof such that the interfering signal is cancelled or substantially attenuated.

Abstract: Loran C signal processing apparatus is provided which employs a single signal channel or path to process and sample Loran C RF signals and envelope derived Loran C RF signals which in conventional approaches are processed and sampled in separate signal paths.

Abstract: The presence of a pulsed radio frequency signal is detected by periodically sampling such signal with first and second sampling strobes in quadrature relationship. The first and second strobes are separately accumulated for a first period of time overlapping a second period of time during which the first and second strobes are also accumulated. The four sums resulting from such accumulations are compared with a predetermined threshold level to determine the presence of the pulsed radio frequency signal.