Abstract: A method and apparatus for controlling transmission power in a variable rate communication system is disclosed. The method disclosed provides for a closed loop power control method. A first remote station controls the transmission power of a second remote station by transmitting a rate dependent power control signal to the second remote communication station. Since only the second communication knows its transmission rate a priori, it must determine its course of action in accordance with both the received power control signal and the knowledge of its transmission rate.

Abstract: The process of the present invention enables a mobile radiotelephone to operate at a 100% duty cycle while providing closed loop power control. The base station measures the signal to noise ratio of the signal from the mobile and compares that SNR with the SNR threshold values the base station has for each data rate the mobile is capable of transmitting. The base station then generates power control commands to instruct the mobile to change its power depending on the outcome of the comparisons.

Abstract: A modulator for a spread spectrum telecommunication system not only receives local data and processes it, but also receives input data from one or more other modulators, sums the input data with the local data, and provides the sum as data for a subsequent modulator or as final output for a transmit power amplifier. The modulator includes an input block and an output block and, depending on a control data signal, input data will be summed with the internally generated local data of the modulator before being provided to the output block. The output data can include parity data. The parity data can be used to check for faults such as might be introduced, for example, by a faulty connection or broken hard-wired interconnect. If an error is detected, the summation function of the transmit modulator can be automatically disabled.

Abstract: An integrated search processor used in a modem for a spread spectrum communications system buffers receive samples and utilizes a time sliced transform processor operating on successive offsets from the buffer. The search processor autonomously steps through a search as configured by a microprocessor specified search parameter set, which can include the group of antennas to search over, the starting offset and width of the search window to search over, and the number of Walsh symbols to accumulate results at each offset. The search processor calculates the correlation energy at each offset, and presents a summary report of the best paths found in the search to use for demodulation element reassignment. The search is done in a linear fashion independent of the probability that a signal being searched for was transmitted at any given time.

Abstract: An integrated demodulation processor used in a modem for a spread spectrum communications system despreads multipath receive signals then uses a time sliced transform processor to process the multiple signals in to a single series of soft decision results. The demodulation processor uses a single transform engine which operates on a time slice basis. The output of the processor engine cascade through a pipeline processor which, on a time slice basis, operates on signals corresponding to each multipath receive signal. The processed results are dual maxima decoded to provide soft decision data.

Abstract: The process of the present invention enables a mobile radiotelephone to operate at a 100% duty cycle while providing closed loop power control. The base station measures the signal to noise ratio of the signal from the mobile and compares that SNR with the SNR threshold values the base station has for each data rate the mobile is capable of transmitting. The base station then generates power control commands to instruct the mobile to change its power depending on the outcome of the comparisons.

Abstract: A ROM circuit that can be modified via the alteration of any one of a set of substance layers is described. The ROM circuit includes a set of ROM cells each of which provide one bit of data used to construct the fixed binary number. Each ROM cell includes a set of circuits that can be placed in either a first or second state via modification of a single substance layer that is different for each circuit, and generates a signal in a logic state that depends on whether the number of circuits in the first state is odd or even. When a design revision occurs the state of one of the circuits from the set of circuits is modified to update the fixed binary number using one of the substance layer already being modified during the course of the design revision.