Abstract: A communication apparatus with a multiple-input and multiple-output (MIMO) channel, includes a minimum mean square error (MMSE) detector configured to estimate quadrature amplitude modulation (QAM) symbols based on signals received through the MIMO channel. The apparatus further includes a QAM demodulator configured to demodulate the estimated QAM symbols, and estimate a first posterior probability of each of encoded bits of the estimated QAM symbols, and a first module configured to remove a first prior probability of each of the encoded bits from the first posterior probability to generate soft estimates of the encoded bits. The apparatus further includes a channel decoder configured to decode the encoded bits based on the soft estimates, and generate an improved posterior probability of each of the encoded bits, and a second module configured to generate a second prior probability of each of the encoded bits based on the improved posterior probability.

Abstract: A communication apparatus with a multiple-input and multiple-output (MIMO) channel, includes a minimum mean square error (MMSE) detector configured to estimate quadrature amplitude modulation (QAM) symbols based on signals received through the MIMO channel. The apparatus further includes a QAM demodulator configured to demodulate the estimated QAM symbols, and estimate a first posterior probability of each of encoded bits of the estimated QAM symbols, and a first module configured to remove a first prior probability of each of the encoded bits from the first posterior probability to generate soft estimates of the encoded bits. The apparatus further includes a channel decoder configured to decode the encoded bits based on the soft estimates, and generate an improved posterior probability of each of the encoded bits, and a second module configured to generate a second prior probability of each of the encoded bits based on the improved posterior probability.

Abstract: Errors are reduced when tracing PRNS code delay, especially in receivers operating on signals with rather low code frequency (C/A code) under multibeam effect without deterioration or with minimum deterioration of the signal-to-noise ratio. A method of increasing noise immunity during reception of signals from satellite navigational systems and a device for realizing the same includes radio modules, an analog-to-digital converter, a digital correlation device and digital correlators. A discrimination signal is generated with a variable delay of the signal copy with respect to the exact copy. The use of the correcting sequence of gating digital signals makes it possible to eliminate the multipath effect at a delay of the reflected signal larger than 1.5 d and reduces its negative effect starting from a delay value greater than d/2. In this case, the energy losses compared with a pure mode of the narrow correlator are increased only by 1.76 dB.

Abstract: The invention relates to the field of radio navigation and, more specifically, it relates to methods of determining the current values of the orbital position of the artificial satellite of the Earth which is used in a satellite radio navigation system (SRNS), by the ephemeredes and can be used when performing the radio navigation measurements in the equipment of the consumers of the SRNS signals.

Abstract: The portable GPS-receiver for a system of personal safety having such attributes, as diminished power consumption, overall dimensions and weight, because the input unit contains the multichannel digital correlator with N=by 8 to 12 channels of parallel processing connected with the microprocessor equipped with permanent storage unit for storage of the programs of signal processing and operative storage for data storage by activity in a standard mode without interlock of GPS signals, thus the microprocessor of the output unit is connected by trunks of a data exchange to the former of clock signals and heterodyne frequencies of an input unit, with an input-output unit of the data, with the transceiver unit and in addition provided with the permanent storage unit for storage of the programs of signal processing and operative storage for data storage and samples of the multichannel digital correlator for operation in conditions of interlock of GPS signals, and each of N of channels of the multichannel digi

Abstract: Digital correlator of a receiver for reception of signals of satellite radio navigation systems which has one or more decision making unit(s) generating detection signals indicative of a strength of the received signals of satellite radio navigation systems, whereby a fast search is performed for detection of strong signals, and a slow search is performed only when signals were not detected during the fast search.

Abstract: Receiver of pseudonoise signals of satellite radio navigation systems for determining coordinates and time using signals of GLONASS and GPS systems, characterized by small dimensions and absence of complicated elements such as digitizers.