Abstract: The invention relates to a technique for controlling a synchronization of a terminal device (10) with a wireless network, e.g. an LTE network, wherein data are transmitted as a continuous data signal on a radio interface (11, 12) while being processed block-wise in the terminal (10). A method embodiment of the technique for achieving at least a downlink (11) synchronization comprises establishing a time-address mapping (TAM, 36) indicative of an association of a reference time value of an internal clock (32) with a reference address in the reception data buffer (16); determining an address of data samples representing the received data block in the reception data buffer (16) based on the time-address mapping; and initiating a block-wise reading of the data block from the reception data buffer (16) based on the determined address.

Abstract: A technique for cell signature determination in a cellular communication network is described.

Abstract: The invention refers to supporting a cell search within a cellular communications network by evaluating a radio signal received from the network, the radio signal covering a certain frequency range composed of a plurality of frequency bands, wherein each band is associated to a certain carrier frequency, the method comprising generating (204) a set of digital signals associated to different carrier frequencies by demodulating the radio signal, evaluating (206) each of the set of digital signals in order to detect a presence of a recurring signal component with a known property, and selecting a corresponding cell, and synchronizing (210) to the carrier frequency associated to the selected cell.

Abstract: A technique for adjusting a phase relationship among modulation symbols is disclosed. A method embodiment of this technique comprises the steps of applying to a sequence of modulation symbols a phase ramp that continuously increases over the duration of the symbol sequence, and applying a compensation phase to each modulation symbol to introduce a phase offset between two subsequent modulation symbols. The joint application of the phase ramp and the compensation phase can be used to establish a saw tooth-like phase characteristic over the sequence of modulation symbols. In one embodiment, the phase ramp is applied in the context of impressing a frequency shift on the modulation symbols.

Abstract: A technique for cell signature determination in a cellular communication network is provided. A method implementation of this technique comprises the steps of providing a set of hypothesis signals, each hypothesis signal including a signature hypothesis, receiving a composite signal including a first signal portion carrying a first signature from a first cell and a second signal portion carrying a second signature from a second cell, wherein the first signal portion and the second signal portion overlap at least partially in time, and obtaining a correlation result by correlating the composite signal with each hypothesis signal. After the first signature has been determined, a set of phantom signatures associated with the first signature is provided. The phantom signatures represent artifacts from the first signal portion in the correlation result. Finally, the second signature is determined based on the correlation result taking into account the set of phantom signatures associated with the first signature.

Abstract: A technique for generating a single carrier frequency division multiple access (SC-FDMA) signal is described, in which from a set of M input symbols a set of N output symbols (M<N) is generated. A method implementation of this technique comprises receiving a set of M input symbols in a time domain representation, subjecting the set of M input symbols to an interpolation operation in the time domain to obtain L interpolated samples (L?N), mapping the interpolated symbols, or symbols derived from the interpolated symbols, to N orthogonal sub-carriers, and outputting N output symbols in a time domain representation.

Abstract: A baseband processing technique is described that permits to process in an analog signal domain a complex-valued baseband signal to laterally remove interference components resulting, for example, from in-band blocking signals. In an exemplary device implementation, the baseband processing device is configured to receive a baseband signal having a designated signal bandwidth defined by two opposite band edges, wherein a first frequency shift in a first direction toward a first band edge is impressed on the baseband signal.

Abstract: A method and device for generating a Single-Carrier Frequency Division Multiple Access (SC-FDMA) signal having a transmission bandwidth and a Constant Amplitude Zero-Autocorrelation (CAZAC) sequence of length NCAZAC. The SC-FDMA signal is presumed to have a time-domain formulation with a term representative of an Inverse Discrete Fourier Transform (IDFT) of length M, where M>NCAZAC. A frequency-domain representation of the CAZAC sequence is mapped to NCAZAC of MSEQ frequency points, where NCAZAC<MSEQ<M, and the remaining frequency points are filled with zeros to obtain MSEQ frequency-domain samples. An IDFT of size MSEQ is applied to the resulting frequency-domain samples to obtain a sub-sampled time-domain representation of the CAZAC sequence, which is then up-sampled according to the transmission bandwidth to generate the SC-FDMA signal.

Abstract: A technique for generating a Single-Carrier Frequency Division Multiple Access (SC-FDMA) signal based on a Constant Amplitude Zero Auto-Correlation (CAZAC) sequence is disclosed. A method embodiment of this technique comprises generating a frequency domain representation of the CAZAC sequence by providing an analytical representation of the CAZAC sequence in the frequency domain with an integer phase term and calculating the integer phase term in a recursive manner for each of a plurality of frequency domain samples of the CAZAC sequence. The resulting frequency domain representation of the CAZAC sequence is then mapped to a pre-determined frequency location before being transformed into the time domain to obtain a time domain representation of the SC-FDMA signal. The SC-FDMA signal may be a random access signal for transmission on a Physical Random Access Channel (PRACH).

Abstract: A technique for determining a frequency offset between components of a communication network based on a Constant Amplitude Zero Auto-Correlation (CAZAC) sequence is described. A method implementation of this technique comprises a provision of a set of correlation signals at different frequencies, with each correlation signal being indicative of a specific frequency offset hypothesis and comprising the CAZAC sequence. Once a synchronization signal comprising the CAZAC sequence is received, this synchronization signal is correlated with each of the correlation signals to obtain a correlation result for each frequency offset hypothesis. In a next step, at least one of the frequency offset hypotheses is selected based on a comparison of the correlation results. The frequency offset may then be determined based on the at least one selected frequency offset hypothesis.

Abstract: The invention relates to a technique for controlling a synchronization of a terminal device (10) with a wireless network, e.g. an LTE network, wherein data are transmitted as a continuous data signal on a radio interface (11, 12) while being processed block-wise in the terminal (10). A method embodiment of the technique for achieving at least a downlink (11) synchronization comprises establishing a time-address mapping (TAM, 36) indicative of an association of a reference time value of an internal clock (32) with a reference address in the reception data buffer (16); determining an address of data samples representing the received data block in the reception data buffer (16) based on the time-address mapping; and initiating a block-wise reading of the data block from the reception data buffer (16) based on the determined address.

Abstract: A technique for controlling a gain of a receiver is provided. A method implementation of this technique comprises the steps of receiving at least one signal, initially controlling the gain of the receiver based on a correlation value of a first part of the received signal having a substantially constant signal strength, determining at least one timing-related parameter of the received signal based on the at least first part, identifying based on the at least one timing-related parameter at least a second part of the received signal having a substantially constant signal strength and further controlling the gain of the receiver based on a measured signal strength of the identified second part.

Abstract: A peak power reduction technique for a transmitter stage configured to map a set of input symbols onto a set of orthogonal subcarriers to generate a modulated signal is proposed. The technique can be adaptively implemented responsive to a dynamically changing subcarrier allocation. In a method realization, the technique comprises the steps of receiving the modulated signal in a time domain representation, evaluating a power distribution of the modulated signal in the time domain to detect one or more power peaks, and processing the one or more peaks detected in the modulated signal taking into account the dynamically changing subcarrier mapping.

Abstract: A technique for adjusting a phase relationship among modulation symbols is disclosed. A method embodiment of this technique comprises the steps of applying to a sequence of modulation symbols a phase ramp that continuously increases over the duration of the symbol sequence, and applying a compensation phase to each modulation symbol to introduce a phase offset between two subsequent modulation symbols. The joint application of the phase ramp and the compensation phase can be used to establish a saw tooth-like phase characteristic over the sequence of modulation symbols. In one embodiment, the phase ramp is applied in the context of impressing a frequency shift on the modulation symbols.

Abstract: A technique for generating a Single-Carrier Frequency Division Multiple Access, or SC-FDMA, signal having a transmission bandwidth and comprising a Constant Amplitude Zero-Autocorrelation, or CAZAC, sequence of length NCAZAC is described. It will be assumed that the SC-FDMA signal has a time domain formulation with a term representative of an Inverse Discrete Fourier Transform, or IDFT, of length M, with M>NCAZAC.

Abstract: A technique for determining a frequency offset between components of a communication network based on a Constant Amplitude Zero Auto-Correlation (CAZAC) sequence is described. A method implementation of this technique comprises a provision of a set of correlation signals at different frequencies, with each correlation signal being indicative of a specific frequency offset hypothesis and comprising the CAZAC sequence. Once a synchronization signal comprising the CAZAC sequence is received, this synchronization signal is correlated with each of the correlation signals to obtain a correlation result for each frequency offset hypothesis. In a next step, at least one of the frequency offset hypotheses is selected based on a comparison of the correlation results. The frequency offset may then be determined based on the at least one selected frequency offset hypothesis.

Abstract: A baseband processing technique is described that permits to process in an analog signal domain a complex-valued baseband signal to laterally remove interference components resulting, for example, from in-band blocking signals. In an exemplary device implementation, the baseband processing device is configured to receive a baseband signal having a designated signal bandwidth defined by two opposite band edges, wherein a first frequency shift in a first direction toward a first band edge is impressed on the baseband signal.

Abstract: A technique for performing a random access procedure in a fast moving mobile device in context with accessing a radio base station is described. A method embodiment of the technique comprises tuning a receiver of the mobile device to an expected frequency of a pilot signal provided by the base station; determining, based on an output signal of the receiver, a feedback signal for locking the receiver to a receive frequency of the pilot signal; providing the feedback signal to a transmitter of the mobile device; and adjusting a transmission frequency of a random access signal according to a frequency offset between the expected frequency and the receive frequency of the pilot signal indicated by the feedback signal.

Abstract: A technique for generating a single carrier frequency division multiple access (SC-FDMA) signal is described, in which from a set of M input symbols a set of N output symbols (M<N) is generated. A method implementation of this technique comprises receiving a set of M input symbols in a time domain representation subjecting the se of M input symbols to an interpolation operation in the time domain to obtain L interpolated samples (L?N), mapping the interpolated symbols, or symbols derived from the interpolated symbols, to N orthogonal sub-carriers, and outputting N output symbols in a time domain representation.

Abstract: A technique for generating a Single-Carrier Frequency Division Multiple Access (SC-FDMA) signal based on a Constant Amplitude Zero Auto-Correlation (CAZAC) sequence is disclosed. A method embodiment of this technique comprises generating a frequency domain representation of the CAZAC sequence by providing an analytical representation of the CAZAC sequence in the frequency domain with an integer phase term and calculating the integer phase term in a recursive manner for each of a plurality of frequency domain samples of the CAZAC sequence. The resulting frequency domain representation of the CAZAC sequence is then mapped to a predetermined frequency location before being transformed into the time domain to obtain a time domain representation of the SC-FDMA signal. The SC-FDMA signal may be a random access signal for transmission on a Physical Random Access Channel (PRACH).