Abstract: A method is provided for memory management in a communications system using a HARQ error control mechanism, in which a transmitter establishes a plurality of HARQ channels with a receiver. The method includes determining whether each received encoded HARQ packet needs to be combined with an encoded HARQ packet already stored in HARQ memory. In case a received encoded HARQ packet does not need to be combined, the method determines whether there is a free memory space available in the HARQ memory for storing that received encoded HARQ packet, and if so, allocating that free memory space for storage of that received encoded HARQ packet. If not, the method determines whether a certain amount of memory space can be forced to be freed, and if so, de-allocates it and then allocates it for storage of that received encoded HARQ packet, that packet is sent to an FEC decoder.
Abstract: An embodiment of a method for switching to an operating mode a device comprising a counter counting the pulses number of a first clock and a date synchronized with an external reference date. The embodiment comprising at least: step A: at a first pulse edge of the first clock, storing corresponding first pulses number and first date synchronized with a first reference date; step B: at a second pulse edge of the first clock, storing corresponding second pulses number and second date synchronized with a second reference date; step C: computing a frequency error of the first clock by using at least the values stored; step D: according to the frequency error, computing a third pulses number; and step E: switching the device to the second operating mode at the occurrence of the third pulses number.
Abstract: A method of detecting at least a radar signal in an incoming signal received by a wireless communication system, comprising the steps of obtaining a measurement of said incoming signal during a measurement duration proportional to a known pulse duration of a known radar signal, performing a first comparison between said measurement and a first threshold, performing an intermediate test if said measurement exceeds said first threshold, characterized in that it further includes the step of performing a second comparison between said measurement and a second threshold if said measurement exceeds said first threshold, said second threshold being greater than said first threshold, and in that said intermediate test is only conditionally performed if said measurement exceeds said second threshold.
Abstract: A gain-controlled RF amplifier system has an input node and an output node. The system has a plurality of amplifier devices, selectively connectable between the input node and the output node. The amplifier devices are placed in circuit according to a measured gain derived by comparing a magnitude of a signal input to the input node against a magnitude of a signal output from the output node, and a desired value of gain.
Abstract: An embodiment of a method for decoding a received signal function of at least a channel matrix B, and of a first and second symbols S1, and S2 belonging to a signal constellation. The method comprises the steps of: selecting a set of values of the first symbol S1 in the signal constellation; for each selected value of the first symbol S1: estimating the value of the second symbol S2 to generate an estimated value of the second symbol; calculating an Euclidean distance between the received signal and a noiseless signal defined by the first symbol with said selected value and by the second symbol with said estimated value; selecting the minimal Euclidean distance among the Euclidean distances respectively calculated for the different selected values of the set of possible values of the first symbol; and selecting decoded first and second symbols corresponding to the selected minimum Euclidean distance.
Abstract: A method of synchronizing a base station of a wireless communication system and a subscriber communication equipment located in the coverage area of the base station by compensating a sampling frequency offset in the subscriber equipment by interpolating input and/or output signals of a radio frequency part of the communication equipment to generate samples corresponding to the original symbol timing of the base station, and compensating the carrier frequency offset from the estimate of the sampling clock error.
Abstract: A method and apparatus are provided for radio access technology (RAT) monitoring, in a wireless system environment having wireless communications equipment and at least two different RATs that coexist for providing to the equipment access to one or more communications networks. The equipment has at least two subsystems, each adapted for establishing and maintaining an active communications connection with a certain one of the different RATs. The equipment selects at least a first RAT, among all the RATs available in a certain geographical area, for establishing the active communications connection, according to a monitored characteristic of the first RAT. The method includes scanning a characteristic of a second RAT available for communication in the geographical area while the equipment maintains an active communications connection with the first RAT, and performing the scanning step when the equipment does not transmit signals through the active communications connection maintained with the first RAT.
Abstract: A peak power reduction method for wireless communication systems is proposed in which a constellation shaping is applied on input data symbols in order to reduce the peak power of the signal samples to be transmitted by the communication system. According to the invention, the symbols are modified using functions each representing the contribution of a symbol to the output signal samples of large magnitude.
Abstract: A method is provided for memory management in a communications system using a HARQ error control mechanism, in which a transmitter establishes a plurality of HARQ channels with a receiver. The method includes determining whether each received encoded HARQ packet needs to be combined with an encoded HARQ packet already stored in HARQ memory. In case a received encoded HARQ packet does not need to be combined, the method determines whether there is a free memory space available in the HARQ memory for storing that received encoded HARQ packet, and if so, allocating that free memory space for storage of that received encoded HARQ packet. If not, the method determines whether a certain amount of memory space can be forced to be freed, and if so, de-allocates it and then allocates it for storage of that received encoded HARQ packet, that packet is sent to an FEC decoder.
Abstract: A gain-controlled RF amplifier system has an input node and an output node. The system has a plurality of amplifier devices, selectively connectable between the input node and the output node. The amplifier devices are placed in circuit according to a measured gain derived by comparing a magnitude of a signal input to the input node against a magnitude of a signal output from the output node, and a desired value of gain.