Abstract: A technique for controlling a receiver to enter a micro sleep mode during which at least one receiver component is temporarily switched off is described. The receiver is configured to process sub-frames each having a first sub-frame portion followed by a second sub-frame portion, the first sub-frame portion carrying information indicative of whether or not the second sub-frame portion needs to be decoded.

Abstract: A technique for performing channel estimation based on a received signal comprising a first signal part and a second signal part in the presence of an unknown phase discontinuity between the first signal part and the second signal part is presented. A method implementation of this technique comprises providing a first channel parameter that is based on the first signal part, determining a second channel parameter based on the second signal part, estimating the phase discontinuity from the first channel parameter and the second channel parameter, updating the first channel parameter based on the estimated phase discontinuity, and determining a channel estimate based on the second signal part including performing channel estimation filtering using the updated first channel parameter as filter state information.

Abstract: A technique for decoding a signal in a communication network is provided. A method implementation of the technique comprises the steps of receiving a signal; identifying a position in the signal; initializing a Viterbi state metric; and decoding the encoded signal by means of a wrap-around Viterbi algorithm. The received signal comprises information, wherein the signal is encoded by a tail-biting convolutional code. The identified position relates to a known portion of the information. The initialized Viterbi state metric is consistent with the known portion of the information. The decoding uses the initial Viterbi state metric, wherein the decoding starts at a decoding step following the identified position.

Abstract: A technique for processing information in a wireless communication network is described. In a method in accordance with the technique, a signal encoded with a convolution code is received. The encoded signal comprises information and a check value. The encoded signal is decoded using a Viterbi algorithm to derive the information and the check value. The decoding includes computing a Viterbi state metric. A reliability parameter is then determined based on the Viterbi state metric. The information is selectively processed depending on both the check value and the reliability parameter.

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 receiving apparatus for a digital mobile communication system comprises an adaptive filter for filtering an input signal. A step-size parameter chosen for the adaption of filter coefficients of the adaptive filter is computed from a variation of the filter coefficients used by the adaptive filter. This facilitates an indirect measure for the channel variation so that a good reception quality over a wide range of user velocities may be enabled in contrast to a system design based on a compromise step-size parameter being optimum for one velocity only.

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 receiver apparatus and method are provided blind amplitude estimation for a received complex signal, wherein the complex signal is analyzed to determine first and second order statistics of real part and imaginary part of the complex signal. Based on a predetermined non-linear function, amplitude scaling information is pre-calculated and used to derive a desired amplitude scaling information for said determined first and second order statistics. Thereby, a low complexity method for blind amplitude estimation for unknown data symbols distorted by an unknown amount of noise can be provided.

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 communication device (100) for communicating in accordance with a hybrid automatic repeat request protocol, the communication device (100) comprising a receiving unit (102) adapted for receiving a communication message including soft-bit values, the soft-bit values representing reliability information for received verification data verifying proper transmission of the communication message, a storage unit (104) adapted for storing the soft-bit values, and a storage management unit (106) adapted for dynamically managing storage of the soft-bit values in the storage unit (104) so that soft-bit values failing to fulfil at least one relevance criteria are not maintained in the storage unit (104).

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: Wireless communication systems according to 3rd Generation standards allow for large flexibility in payload transmission. To signal the specific combination of transport block sizes multiplexed into one composite transport channel, a transport format combination indicator is transmitted in addition to the encoded payload data. The correct decoding of this transport format combination indicator codeword information is crucial to retrieve the correct number and size of transport blocks from the incoming data stream in the receiver, which can be both, the user equipment or the base station. The decoding apparatus (1) of the invention allows an in-time processing of the incoming data, while the decoding performance for the next codeword information is increased. Therefore, a codeword decision unit (15) determines a first codeword decision on the basis of a first codeword information received. This first codeword decision is usable for the processing of the first payload data.

Abstract: A technique for radio resource management is proposed for controlling a wireless transceiver in a cellular communication system that comprises a scheduling channel configured to transport relative scheduling grants for signalling adjustments in transmission resources previously granted to the wireless transceiver. A method embodiment of this technique comprises the steps of deriving an amplitude parameter indicative of an instantaneous amplitude level of the scheduling channel, determining a threshold value taking into account the amplitude parameter, processing a scheduling signal received over the scheduling channel to obtain a signal sample comprising a relative scheduling grant, and subjecting the signal sample to a threshold decision based on the threshold value to decode the relative scheduling grant.

Abstract: Methods, apparatus, systems and devices are implemented according to a number of embodiments. According to one such embodiment, a method of synchronizing a receiver to a timing and carrier frequency of a communication system is implemented. A set of predetermined possible synchronization patterns is detected in a received signal. Timing and structure information is generated specifying the occurrence of detected ones of said predetermined set of possible synchronization patterns in said received signal. Channel coefficient estimations of different receiving channels are derived from the timing and structure information. A carrier frequency offset is determined for the received signal based on a comparison of predetermined ones of said derived channel coefficient estimates.

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 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: The present invention concerns a method for estimating the time-dispersion of a channel comprising D subchannels, wherein one computes from a received signal a set of estimated Channel Transfer Factors (CTF's) ?[?], where ?(0???D) is the subchannel number, said method comprising a step of calculating, for a predetermined strictly positive integer d, a correlation factor Cd representing the correlations, both in amplitude and in phase, between pairs ?[?] and ?[?+d] of said computed CTF estimates. By an appropriate choice of d, the time-dispersion resolution can be adapted to most prevalent channels. The correlation is optionally corrected according to the mean channel estimation signal-to-noise ratio. This method can be used for many applications where knowing the time-dispersion characteristics of a channel is required, and is, for example, particularly suitable for designing a channel estimation filter, and for link adaptation. Application to devices and apparatus implementing these methods.

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).

Abstract: A technique is provided for determining the configuration of a sub-frame having data symbols including cyclic-prefixes. In some communication standards such as the Long Term Evolution (LTE) standard, a plurality of possible configurations exist for a sub-frame, with each configuration being identifiable by a certain cyclic-prefix length. In an exemplary method realization, the technique includes receiving a data signal comprising the sub-frame, evaluating one or more hypotheses of the cyclic prefix length to produce one or more corresponding evaluation results, and, based on the evaluation results, deciding on a most-likely cyclic prefix length, according to which the sub-frame configuration is determined. The hypothesis evaluation may involve autocorrelation and cyclic accumulation of samples of the received data signal.