Abstract: A differential chaos shift keying (DCSK) communication method based on three-dimensional constellation is provided. Target information bit is mapped to a three-dimensional constellation symbol. An initial chaotic signal generated by a chaotic generator is processed by cyclic shift to generate a chaotic signal group including the initial chaotic signal, a first shifted chaotic signal and a second shifted chaotic signal. Information modulation is performed based on the three-dimensional constellation symbol and the chaotic signal group to obtain an information-bearing signal. A transmission signal is generated based on the information-bearing signal and the initial chaotic signal, and sent to a receiver to generate a received signal, which is subjected to information recovery analysis in the receiver to obtain an estimated information bit. A DCSK communication device based on three-dimensional constellation is also provided.

Abstract: A method and apparatus for determining a weak Wi-Fi signal, a storage medium and a terminal are provided. The method includes: receiving a to-be-determined signal; performing energy sliding accumulation based on the to-be-determined signal to obtain accumulated values of energy values at a plurality of sampled value moments including a current sampled value comment, wherein each of the energy values is determined based on an amplitude value of the to-be-determined signal at the corresponding sampled value moment; determining a product value of a first preset energy threshold and an energy value at a preset sampled value moment; and determining whether the to-be-determined signal is a weak Wi-Fi signal at least based on comparison between the accumulated value of the energy values at the current sampled value moment and the product value, wherein the first preset energy threshold is greater than or equal to 1.

Abstract: A wireless wake-up receiver includes multiple signal chains each signal chain being coupled to continuously receive a signal from a respective antenna and to provide a respective detected pattern at a signal chain output. Each signal chain includes a first path having a mixer-first architecture and operates in a bandpass-mode using differential signals. The wireless wake-up receiver also includes a digital correlator operable to receive the respective detected patterns and to determine whether one of the respective detected patterns is equal to a desired pattern.

Abstract: The disclosure relates to performing phase compensation at a transmitter. A processing device for a network access node generates a phase compensated modulation symbol based on at least one first modulation symbol and at least on one of a frequency offset parameter and a time offset parameter. The frequency offset parameter may be determined based on an offset between a reference frequency f0 and a DC (0 Hz) frequency such that the frequency offset parameter corresponds to the reference frequency f0. Also, the reference frequency f0 can be at least partly based on the carrier of up-conversion frequency used by the processing device and the reference frequency f0 can be the carrier for up-conversion frequency. The phase compensated symbol is transmitted to a receiver, such as a client device. Furthermore, the disclosure also relates to corresponding methods and a computer program.

Abstract: A method, device, and a computer program are provided to decode a signal received through a transmission channel in a communication system, the received signal being represented by a signal vector.

Abstract: A clock data recovery circuit may include: a phase comparison unit suitable for comparing input data with a phase of a multi-phase clock, and for generating an up/down signal corresponding to the comparison result; a filtering unit suitable for counting the up/down signal based on an upper threshold value and a lower threshold value, for setting, when an overflow occurs, the lower threshold value to an initial value for the count of the up/down signal, or when a underflow occurs, the upper threshold value to the initial value for the count of the up/down signal, and for generating a control code corresponding to one of the underflow and the overflow; and a phase rotating unit suitable for adjusting the phase of the multi-phase clock in response to the control code outputted from the filtering unit.

Abstract: A communication system has a first communication device, and a second communication device that conducts wireless communication the first communication device. The first communication device has a first transmitter that transmits a signal to the second communication device while modulating the signal, and a first transmission controller that controls the first transmitter. The second communication device has a first receiver that receives the signal from the first communication device and demodulates the received signal. The first transmission controller performs control so as to change a modulation method in midstream when a predetermined first signal is modulated and transmitted. The first receiver changes a demodulation method according to the change of the modulation method of the first signal in midstream when the first signal is received and demodulated.

Abstract: Symbol detection and soft demapping methods and systems are provided. Individual subset symbol detection according to one or more embodiments involves identifying a search subset of a transmission symbol set for a transmission symbol. For each other transmission symbol in communication signals, multiple search subsets of the transmission symbol set are identified. The multiple search subsets include respective search subsets based on each transmission symbol in either the search subset for the first identified one of the transmission symbols or each of the multiple search subsets identified for a different one of the other transmission symbols. Symbol detection errors may be detected by identifying competing symbols and computing competing distances. Soft demapping may be provided by calculating soft decision results based on detected symbols and weighting the soft decision result.

Abstract: A method for generating a decoding metric in a wireless communication system includes receiving an FQAM symbol and determining transmission probabilities of FQAM symbol candidates from a received value of the FQAM symbol, wherein the transmission probabilities of the FQAM symbol candidates are determined by multiplying a probability that a QAM symbol included in the FQAM symbol is mapped to each of candidate values in one frequency and a probability that a signal is not transmitted in the other at least one frequency. An apparatus in a wireless communication system for supporting FQAM, the apparatus comprising an RF processing unit configured to receive an FQAM symbol, and a modem configured to determine transmission probabilities of FQAM symbol candidates from a received value of the FQAM symbol.

Abstract: A method and system for configuring one or both of a transmitter pulse-shaping filter and a receiver pulse-shaping filter to generate a total partial response that incorporates a predetermined amount of inter-symbol interference (ISI), based on one or more defined performance-related variables and one or more set constraints that are applicable to one or both of the transmitter pulse-shaping filter and the receiver pulse-shaping filters. The predetermined amount of ISI is determined based on an estimation process during extraction of data from an output of the receiver pulse-shaping filter, such that performance of total partial response based communication matches or surpasses performance of communication incorporating filtering based on no or near-zero ISI. The configuring may comprise determining optimized filtering configuration, by applying an optimization process which is based on, at least in part, the one or more constraints and the one or more performance-related variables.

Abstract: A diagnostic data acquisition system for analyzing impairments in a QAM digital communication system is triggered by diagnostic data generated by a QAM demodulator when demodulating a QAM signal. Upon triggering, the data acquisition system can capture the diagnostic data used for triggering, and/or some other diagnostic data. The captured data may be stored for subsequent analysis to determine a probable cause of the impairment.

Abstract: Information bits are encoded according to a low density parity check code with code rate 7/15 and a codeword length of 16200. The resulting codeword bits are bit-interleaved and the interleaved bits are demultiplexed into 8 sequences of bits. The 8 sequences of bits are permuted according to a predetermined permutation rule: v0=b2, v1=b6, v2=b0, v3=b1, v4=b4, v5=b5, v6=b3, v7=b7.

Abstract: A leading edge associated with a received signal is detected to provide, for example, time of arrival information for a ranging algorithm. In some aspects, a method of leading edge detection involves sampling a received signal, generating a drift compensated signal based on the samples, reconstructing the received signal based on the drift compensated signal, and identifying a leading edge associated with the received signal based on the reconstructed signal.

Abstract: A method of identifying radar in a wireless device includes detecting an event corresponding to receipt of a signal by the wireless device. The event can include an analog to digital converter (ADC) saturation, a radio frequency (RF) saturation, and/or an ADC power high condition. Notably, the gain change in the wireless device is delayed for a first predetermined time period. Data preceding the event for the first predetermined time period can be buffered. A first low-resolution fast Fourier transform (FFT), wherein low-resolution FFTs are referred to as short FFTs, can be performed with the buffered data. The first short FFT can be processed. When results of the processing indicate the signal is radar, the radar can then be identified.

Abstract: A method includes receiving a symbol modulated with multiple bits according to a signal constellation including multiple constellation points. A soft metric is computed for a given bit in the symbol: A first constellation point closest to the received symbol according to a distance measure is found. A row or column of the constellation points, which is closest to the first constellation point according to the distance measure, and over which a value of the given bit is constant and is opposite to the value of the given bit in the first constellation point, is identified. At least the identified row or column is searched for a second constellation point that is closest to the received symbol according to the distance measure. The soft metric is calculated based on the first and second constellation points. The value of the given bit is reconstructed based on the soft metric.

Abstract: Provided is a frequency offset estimation apparatus that appropriately estimates and compensates for a frequency offset of a received signal when estimating the frequency offset which is the difference between a carrier frequency of the received signal and the frequency of an output signal of a local oscillator.

Abstract: A signal receiving apparatus has: a radius identifying section configured to identify a radius representing a distance from an origin on an IQ plane of signal points each corresponding to a symbol obtained from a received signal modulated by adoption of an APSK modulation method; and a parameter outputting section configured to output a control parameter related to a demodulation or decoding process of the received signal on the basis of the identified radius.

Abstract: A method is described for controlling a data unit receiver or a data unit sender. The data unit receiver or sender comprise a gap response procedure for responding to gaps in the sequence of data units received at the receiver. A reordering detection procedure S12 is provided for detecting a reordering indication indicative of a potential re-ordering of data units in the course of a transmission from sender to receiver, and the gap response procedure is adapted in response to detecting a re-ordering indication.

Abstract: Incoming data at a high-speed serial receiver is digitized and then digital signal processing (DSP) techniques may be used to perform digital equalization. Such digital techniques may be used to correct various data anomalies. In particular, in a multi-channel system, where crosstalk may be of concern, knowledge of the characteristics of the other channels, or even the data on those channels, may allow crosstalk to be subtracted out. Knowledge of data channel geometries, particularly in the context of backplane transmissions, may allow echoes and reflections caused by connectors to be subtracted out. As data rates increase, fractional rate processing can be employed. For example, the analog-to-digital conversion can be performed at half-rate and then two DSPs can be used in parallel to maintain throughput at the higher initial clock rate. At even higher rates, quadrature techniques can allow analog-to-digital conversion at quarter-rate, with four DSPs used in parallel.

Abstract: Disclosed are a method and an apparatus for transmitting and receiving broadcast data in a digital broadcasting system. The method for transmitting and receiving broadcast data in a digital broadcasting system includes receiving the main data encoded with symbols having a plurality of levels; deciding whether levels of main data symbols encoded with symbols having the plurality of levels belong to a first group; and mapping the main data symbols to extended levels by using modulation values of the additional data if it is decided that the levels of the main data symbols belong to the first group.

Abstract: A method of detecting whether an incoming signal is a signal type of interest having a known training sequence. The signal is filtered with a matched filter as in conventional methods. However, the filter processing is performed in a unique manner that maximizes computational efficiency.

Abstract: A PAM-N decision feedback equalizer (DFE) comprises a coefficient computation unit; a feedback unit that mitigates, using computed feedback coefficients, effects of interference from data symbols; an error-and-decision unit for at least computing a least error value respective to one of a plurality of decision levels, wherein the least error value indicates a difference of a pseudo equalized input PAM-N data symbol from an optimal position of the one of the plurality of decision levels, wherein the one of the plurality of decision levels corresponds to a modulation level used to modulate data in the input PAM-N data symbol; and a calibration unit for adaptively setting the plurality of decision levels based, in part, on the least error value, thereby enabling for compensating for gain changes resulted by a cable on which the input PAM-N data symbol is received and further compensating for embedded offsets of the error-and-decision unit.

Abstract: Methods and systems are provided for coarse phase estimation for highly-spectrally efficient communications. An example method may include, equalizing, in a receiver, a received inter-symbol correlated (ISC) signal to generate an equalized ISC signal. A phase adjustment signal may be generated based on an ISC feedback signal. The ISC feedback signal may be generated using a sequence estimation process and a non-linearity function. A phase of the equalized ISC signal may be adjusted using the generated phase adjustment signal, to generate a phase adjusted partial response signal. The phase adjustment signal may be generated based on a phase difference between the equalized ISC signal and the partial response feedback signal. At least one ISC vector may be generated by buffering samples of the phase adjusted ISC signal.

Abstract: Symbol detection and soft dempapping methods and systems are provided. Individual subset symbol detection according to an embodiment of the invention involves identifying a search subset of a transmission symbol set for a transmission symbol. For each other transmission symbol in communication signals, multiple search subsets of the transmission symbol set are identified. The multiple search subsets include respective search subsets based on each transmission symbol in either the search subset for the first identified one of the transmission symbols or each of the multiple search subsets identified for a different one of the other transmission symbols. Symbol detection errors may be detected by identifying competing symbols and computing competing distances. Soft demapping may be provided by calculating soft decision results based on detected symbols and weighting the soft decision result.

Abstract: A method of improving sensitivity in the demodulation of a received signal by a receiver over an arbitrary measurement time epoch, said method comprising the steps of correlating said received signal with a local replica of pseudo noise code in a coherent fashion creating a correlation signal and utilizing a Viterbi phase state keying trellis demodulation with a variable resolution of phase states over 0 to 360° to demodulate the radio frequency phase trajectory of said correlation signal throughout the measurement time epoch for improving sensitivity in the demodulation of a received signal.

Abstract: Provided is a frequency offset estimation apparatus that appropriately estimates and compensates for a frequency offset of a received signal when estimating the frequency offset which is the difference between a carrier frequency of the received signal and the frequency of an output signal of a local oscillator.

Abstract: The present invention relates to a method for processing digital signals and to a transmission/reception system implementing said method; the present invention is based on the use of LDPC codes, in particular the LDPC code of the DVB-S2 standard, in combination with a QAM modulation, in particular the 1024QAM and 4096QAM modulations; in transmission, a bit permutation (Demux) is carried out prior to the QAM constellation mapping function; in reception, the bit permutation is carried out after the QAM constellation demapping function.

Abstract: Methods and systems are disclosed herein for discriminating phase-shift-key (PSK) modulated signals from frequency-shift-key (FSK) modulated signals in received signal streams. First, a bit frequency analysis is applied to a digital signal stream representing the received signal stream. The bit frequency analysis computes bit frequencies for bit segments within the digital signal stream. These bit frequencies are then summed in an array to form a bit frequency histogram. Second, a bit phase analysis is applied to the digital signal stream. The bit phase analysis computes bit phases for bit segments within the digital signal stream. These bit phases are then summed in an array to form a bit phase histogram. Spikes within the bit frequency and bit phase histograms can be used to determine whether the received signal stream includes FSK or PSK signals. An enhanced bit phase analysis can also used, if needed.

Abstract: Device (D) for communicating between a mobile element and a fixed element, includes: an electromagnetic field-based reader (L) including a transmitter with a transmitting antenna and a receiver with a first antenna placed in a housing (1), and a beacon (B) including a receiver able to receive a signal originating from the transmitter of the reader (L) so as to provide energy to a transmitter able to dispatch a signal received by the receiver of the reader (L), the receiver of the reader (L) including at least one second antenna and signal comparison elements able to compare the signal received by the first antenna of the receiver with the signal received by the second antenna so as to determine the moment at which the reader (L) passes vertically in line with the beacon (B).

Abstract: Symbol detection and soft dempapping methods and systems are provided. Individual subset symbol detection according to an embodiment of the invention involves identifying a search subset of a transmission symbol set for a transmission symbol. For each other transmission symbol in communication signals, multiple search subsets of the transmission symbol set are identified. The multiple search subsets include respective search subsets based on each transmission symbol in either the search subset for the first identified one of the transmission symbols or each of the multiple search subsets identified for a different one of the other transmission symbols. Symbol detection errors may be detected by identifying competing symbols and computing competing distances. Soft demapping may be provided by calculating soft decision results based on detected symbols and weighting the soft decision result.

Abstract: A method of processing a signal in a wireless network including multiple chains is provided. This method can include receiving the signal in a receiver and, for each chain, performing a Barker correlation on the signal to generate a Barker correlated signal. At this point, an autocorrelation can be performed on the Barker correlated signal to generate an autocorrelated signal. The autocorrelated signals from the multiple chains can be summed to generate a summed output. Additional processing, e.g. at least one of CCK weak signal detection, peak selection in a rake receiver, frequency estimation, and differential decoding, can then be performed based on the summed output.

Abstract: A Gaussian Frequency Shift Keying/Frequency Shift Keying (GFSK/FSK) modulation circuit implemented in a digital manner comprises a frequency divider for dividing frequency of an inputted clock signal to get a sampling signal, a buffer coupled to the frequency divider for storing inputted data, an integrator coupled to the buffer for processing integration according to the data outputted from the buffer, a first read only memory coupled to the integrator for transferring the data outputted from the integrator according to a cosine function, and a second read only memory coupled to the integrator for transferring the data outputted from the integrator according to a sine function.

Abstract: A frequency shift keying (FSK) demodulator includes a band-pass filter, an auto-calibration loop, a phase comparator, and an analog-to-digital converter. The band-pass filter is used for shifting phase of an FSK signal to generate a revised FSK signal. The auto-calibration loop is coupled to the band-pass filter for adjusting a center frequency of the band-pass filter. The first input end of the phase comparator is coupled to an output end of the band-pass filter, and the second input end of the phase comparator is used for receiving the FSK signal. The phase comparator is used for comparing the FSK signal with the revised FSK signal and outputting a comparison result. The analog-to-digital converter is coupled to the phase comparator for converting the results of the phase comparator into digital data. Similarly, a frequency modulation (FM) demodulator includes a band-pass filter, an auto-calibration loop, and a phase comparator.

Abstract: An aircraft transponder comprises an antenna for receiving an RF signal a downconverter coupled to the antenna for downconverting the RF signal to an IF signal, an analog-to-digital converter coupled to the downconverter to digitize the IF signal to produce a digital signal, and; a processor unit coupled to the analog-to-digital converter. The processor unit is configured to: (1) generate a delayed digital signal; (2) multiply a delayed digital signal by the digital signal to produce a multiplied output; and (3) filter the multiplied output to produce a filtered output having a positive or negative sign. The transponder further includes a sign converter operable to output a one or zero based on the sign of the filtered output to recover the data component.

Abstract: Method for transmitting an information representative of the number of spreading codes allocated to the mobile stations in communication with a base station of a mobile telecommunication system, wherein it includes the step of: forming a word, said transmitted word, the content of which is representative of the number of spreading codes allocated, including in each transmission burst a general midamble resulting from the sum of selected midambles among all the available midambles, said selection being done by said base station in relation with said transmitted word so that a selected midamble corresponds to a binary element of said transmitted word equal to a first value and a non-selected midamble corresponds to a binary element of said transmitted word equal to second value, considering a received word the elements of which are in one-to-one relationship with the temporal positions of the estimations respectively corresponding to said available midambles.

Abstract: The disclosed embodiments relate to exploiting circuitry that exists in a typical Orthogonal Frequency Division Multiplexing (OFDM) receiver to find the phase of a complex number corresponding to an input signal without implementing additional costly circuitry or employing a relatively slow inverse tangent look-up table. The magnitude of the complex number is normalized and processed through a closed loop to produce an output proportional to the phase of the complex number.

Abstract: The present disclosure relates generally to systems and methods for transmitter leak-over cancellation. In one example, a method includes transmitting a signal via a transmit chain in a wireless device, where a portion of the signal leaks over into a receive chain of the wireless device and generates higher order products that interfere with a signal being received by the wireless device. A portion of the signal from the transmit chain is diverted into cancellation circuitry coupled to the receive chain prior to a location in the transmit chain where leak-over occurs, and an amplitude and phase of the portion is manipulated. The manipulated portion is combined with the received signal and other portion to at least partially cancel interference caused by the portion leaking over into the receive chain.

Abstract: Modulator system (1) comprising modulators (2, 3, 4) for modulating input signals (A) according to different modulation schemes (8PSK, GMSK) cause discontinuities in the output signals (F) when switching between the schemes. By providing the modulator systems (1) with compensators (13, 22-26) for compensating amplitudes/phases of the output signals (F) of the modulator system (1) for discontinuities, these discontinuities resulting from modulation scheme changes are reduced to a large extent. This may be done before/after the pulse shapers (11, 21). The compensators (13, 22-26) comprise multipliers for multiplying pulse shaped modulated signals with complex valued waveforms (E), or for multiplying modulated signals with waveforms (S, T), or for multiplying complex valued signals (B, C, D) with complex valued phase offsets (X, Y, Z), which complex valued signals (B, C, D) are to be multiplied with mapped input signals.

Abstract: At a base station apparatus, known pilot signals for use in channel estimation are transmitted, and in addition thereto MCS pilot signals that are used to perform adaptive modulations respectively corresponding to a plurality of modulation schemes are multiplexed and output. A mobile station apparatus dispreads the respective MCS signals out of the multiplex signal, compares these to known symbols patterns, and sends the MCS pilot signals that show a matching relationship to the base station apparatus as a mobile station reception result. Upon receiving the mobile station reception result from the mobile station apparatus, the base station apparatus selects the modulation scheme of the optimum modulation level for the downlink signals. This configuration makes it possible to switch the modulation schemes in an accurate and simple way.

Abstract: It is determined whether phase noise and parasitic oscillation take place on the basis of a carrier-to-noise (C/N) ratio calculated with amplitudes in an amplitude direction of signal points of a reception signal and a C/N ratio calculated with amplitudes in a phase direction of the signal points of the reception signal. Further, when it has been determined that phase noise and parasitic oscillation take place, an alarm is displayed on a screen. When it has been determined that phase noise and parasitic oscillation take place, the phase of a demodulation circuit is compensated based on the detected phase noise.

Abstract: The present disclosure relates generally to systems and methods for transmitter leak-over cancellation. In one example, a method includes transmitting a signal via a transmit chain in a wireless device, where a portion of the signal leaks over into a receive chain of the wireless device. A portion of the signal is diverted from the transmit chain into cancellation circuitry coupled to the receive chain to manipulate an amplitude and phase of the portion before combining the manipulated portion with the signal and other portion to at least partially cancel interference caused by the leak-over portion. After downconverting, a remainder portion is filtered from the received signal. A power level of the remainder portion is detected and compared to a threshold value. An amplitude and phase configuration of the cancellation circuitry is modified based on a result of comparing the power level to the threshold value.

Abstract: A receiver is utilized to receive signals from various systems within a vehicle such as tire pressure monitoring system (TPM) and a remote keyless entry system (RKE). During the on time, the receiver sequentially is open to receive a first signal with a first baud rate. If the signal of the first baud rate is not received, the receiver receives a second signal at a second baud rate. Upon receipt of a transmission, the receiver operates according to a mode that corresponds to the transmission indicated by the specific baud rate. The operation of the receiver can include specialized filtering, or other known signal processing that is tailored to the specific transmission data communication requirements.

Abstract: Provided are an apparatus for estimating frequency offset from received signal and method for the same. The apparatus and method estimates frequency offset precisely without increment of autocorrelator by performing moving average filtering on a noised signal to thereby alleviate jitter. The frequency offset estimating apparatus includes: moving average filter for alleviating jitter of received signal; multiplier for multiplying a filtered signal by conjugate complex operanded pilot signal; phase-rotation value calculator for calculating a phase-rotation value from multiplicand operanded signal by using of symbol delay and an autocorrelation function; frequency offset estimator for estimating frequency offset from the phase-rotation value based on a smoothing function multiplication.

Abstract: An SDARS receiver for use with at least two antennae, each of which receives bitstreams from a first satellite, bitstreams from a second satellite, and bitstreams from a terrestrial repeater, including demodulators configured to switch between demodulating bitstreams from the satellites and to switch between demodulating bitstreams from the terrestrial repeater, and a processor coupled to the demodulators, the processor being configured to switch the demodulators according to a variety of algorithms.

Abstract: The invention relates to a radio receiver for the reception of a data burst which is transmitted by a transmitter, in which case the data burst includes a first section which has been modulated using a first modulation method at the transmitter end, and a second section which is transmitted after the first section and has been modulated using a second modulation method at the transmitter end. The radio receiver has a first reception path for processing of the first section and a second reception path for processing of the second section.

Abstract: When a first half of a transmission packet is sent by an FSK modulating signal, and a latter half thereof is sent by a PSK modulating signal, a received signal is converted into an intermediate frequency signal by a mixer. The converted intermediate frequency signal is switched to an FSK demodulation unit and a PSK demodulation unit by a received signal changeover switch. A frequency error detection circuit is provided in the FSK demodulation unit to detect a frequency error detection value. A demodulation circuit of a phase locked loop type of the PSK demodulation unit includes a loop filter. The frequency error detection value detected by the frequency error detection circuit is set as an initial value of this loop filter, whereby a time until lockup of a phase locked loop is reduced at the time when reception of a PSK modulating signal is started.

Abstract: A multi input multi output (MIMO) receiver for receiving signals having a synchronization (SYNC) module being responsive to a plurality of received baseband signals for processing the same to generate maximum ratio combining (MRC) parameters, complementary code keying (CCK) modulated signals and orthogonal frequency division multiplexing (OFDM) modulated signals, said SYNC module for using said MRC parameters to process said OFDM modulated signals to generate a plurality of aligned OFDM signals in time domain, said MIMO receiver for processing said plurality of aligned OFDM signals to generate a plurality of subcarriers, in accordance with an embodiment of the present invention. The MIMO receiver further including a time domain CCK MRC module being responsive to said MRC parameters for processing said CCK modulated signals in time domain to generate aligned signals, said aligned signals being combined to generate an adjusted signal for demodulation.

Abstract: A method for calibrating an I Q demodulator includes measuring I, Q, and low frequency data, correcting each set of measured data, combining the corrected I and Q data, interpolating the corrected low frequency data, and combining the corrected low frequency data and the combined corrected I and Q data.

Abstract: Method and apparatus for detecting a signal are disclosed, wherein first set of symbols represents a signal received in a receiver. A second set of symbols is estimated, representing the signal transmitted at a transmitter using a sphere decoding technique. The estimation may employ at least two modulation schemes. Reliability information relating to bits forming a symbol may be determined for at least one symbol of the second set. Furthermore, reliability information relating to the signal may be taken into account in estimating at least one symbol of the second set.

Abstract: A method for decoding signals with encoded symbols over a symbol interval that modulate a carrier. The method includes phase locking the signal to be decoded to obtain a phase-locked signal. The value assumed by the phase-locked signal on at least one subinterval in each symbol interval is detected. The method continues with attributing to the decoded symbol corresponding to each symbol interval a value that is a function of the value detected the subinterval. The subinterval in question can be a single subinterval located at the end of the symbol interval. Alternatively, the value assumed by the phase-locked signal on a plurality of subintervals in each symbol interval is detected, and a respective majority value of said phase-locked signal within said plurality of subintervals is identified. A value determined on the basis of the majority value is attributed to the decoded symbol corresponding to each symbol interval.