Abstract:
A method and apparatus for determining a mobile station's location using an antenna beam that traverses a scan pattern is described herein. In one embodiment, a device transmits/receives a signal as a position of a transmission/reception antenna beam traverses the scan pattern in a non-sequential order. A strength of the received signal is measured at a plurality of the beam positions. After reordering the signal strength measurements, the mobile station location relative to a nominal center of the beam is determined based on the reordered signal strength measurements. Another embodiment uses signals having different frequency components that are transmitted or received in beams executed in different scan patterns. In this embodiment, signal strength measurements associated with different frequency components are jointly processed to determine a combined correlation. The relative mobile station location is determined based on the combined correlation.
Abstract:
A fast, high resolution digital-to-analog converter (DAC) is described herein. The DAC comprises a pulse generator, decay circuit, controller, and sample circuit. The pulse generator serially outputs pulses representing digits of a digital word least significant digit first. Each pulse generates a response in the decay circuit that decays over time according to a known decay response. One exemplary decay circuit comprises an RC circuit having an exponential decay response. The controller controls the timing of the pulses output by the pulse generator such that the period of each pulse relates to a predetermined decay amount. The sample circuit samples an output of the decay circuit at a sample time after the decay circuit receives the pulse for the most significant digit. The sampled output represents the analog value corresponding to the input digital word. The digital word may have any length, radix, or format.
Abstract:
A first orthogonal codeset, obtainable in various manners, is used in a first cell to provide orthogonal spreading codes for traffic signals originating within the first cell. A second orthogonal code set for use in a second cell is obtained that has at least a first code in common with the first orthogonal code set by selecting any code in the first codeset to be the first common code. The plural orthogonal codesets can be utilized in various ways and in various environments. For example, the plural orthogonal codesets can be used for operation of a user equipment unit in a code division multiple access (CDMA) network.
Abstract:
[00085] Systems (20, 120, 220) for transmitting information symbols utilize ternary codes or pivot codes in conjunction with spread spectrum encoding. The systems comprise at least a first symbol source for supplying an information signal comprising at least a first stream of I,Q bit pairs, means (34)(130, 134)(230, 234) for using either a ternary code or at least one pivot code for spreading the at least first stream of I,Q bit pairs and thereby respectively forming first chips and second chips, and a radio signal modulator (44) for transmitting the first chips and second chips over a radio interface
Abstract:
A system and method for digitally signing a document including a personal computer which receives the document to be digitally signed. A representation of the document is created from the document and this representation is forwarded to a personal trusted device such as a mobile terminal, personal computer, etc. The user may then view the document on the personal computer and provide a digital signature of the document from the personal trusted device.
Abstract:
Un sistema de comunicaciones celulares para comunicar con abonados móviles con base terrestre situadosdentro de una célula y con un avión (55) que vuela a través de la célula, comprendiendo dicho sistema:una estación base (52) con base terrestre que da servicio a la célula, incluyendo dicha estación base con baseterrestre: una disposición de antena para generar un haz de antena elevado para comunicar con el avión; una interfaz de control de tráfico aéreo, (ATC), para recibir información ATC desde una red ATC (51); una interfaz celular para recibir comunicaciones celulares desde una red (53) de telecomunicacionescelulares; un multiplexor (54) para multiplexar la información ATC con las comunicaciones celulares en un flujo de datosenviado al avión (55) con el haz de antena elevado; y un transceptor para transmitir el flujo de datos al avión a través del haz de antena elevado; un transceptor (58) del avión a bordo del avión para recibir el flujo de datos desde la estación base con baseterrestre; y un desmultiplexor (62) a bordo del avión para desmultiplexar el flujo de datos y encaminar la información ATC a lacabina de pilotaje del avión, encaminando al mismo tiempo las comunicaciones celulares a los dispositivos decomunicación portátiles a bordo del avión
Abstract:
Establishing a connection between a paging unit and a standby unit in a channel hopping communications system includes activating the standby unit for an activation time period out of every standby time period. During each activation time period, the standby unit monitors a selected channel for receipt of a paging message. The selected channel is selected from a plurality of channels, and, for each subsequent activation time period, the selected channel is a subsequent one of the plurality of channels as specified by a hopping sequence and an internal clock. A page train is repeatedly transmitted from the paging unit to the standby unit, until a response is received from the standby unit. Each page train includes a plurality of paging messages, each paging message being transmitted on a different one of a subset of the plurality of channels. Selection of a page train for transmission by the paging unit may be based on an estimate of the standby unit's internal clock.
Abstract:
In a multi-reuse level cellular communications system, a channel is assigned for use by a mobile unit by first determining whether the mobile unit is a non-enhanced mobile unit or an enhanced mobile unit. Then a determination is made as to the type of communication service being requested. A minimum link quality required by the mobile unit can then be established based on factors that include the mobile unit type and the type of communication service being requested. A base station that has the necessary receiver detection capabilities and transceiver processing capabilities is then selected, and a channel, corresponding to a highest reuse plan, available to the base station is assigned to the call.