摘要:
The invention relates to a turbo decoder (300) for decoding an input signal, the turbo decoder comprises a first decoder (301 ), a second decoder (303), a first limiter (305) arranged between the first decoder (301 ) and the second decoder (303), and a second limiter (307) arranged between the second decoder (303) and the first decoder (301 ).
摘要:
Efficient decoding in IEEE 802.11ah networks can be achieved by transmitting the signal (SIG) preamble field without interleaving bits within the SIG field. This may allow channel equalization and decoding steps to be performed contemporaneously upon reception of the frame, which allows for the implementation of non-linear channel equalization techniques (e.g., maximum likelihood (ML) equalization, etc.
摘要:
There is disclosed a method and receiver for decoding a data signal from analogue signals received at one or more receiving antennas (24). The decoding is performed on the basis of bit value probabilities (66) derived from an effective signal to noise ratio (ESNR) (64) and a respective symbol error value (SEV) (62) calculated for all of the one or more receiving antennas. The ESNR is calculated utilising signal to noise ratios (SNRs) (58) per sub-channel and sub-channel transfer functions (60) measured for each of the one or more receiving antennas (24). Also, the SEVs are calculated utilising the measured sub-channel transfer functions.
摘要:
A digital broadcasting system is disclosed. More particularly, the invention inserts known data in a specific domain of a data section to be transmitted enhanced data and transmits the data to a receiving system. The receiving system uses the transmitted data in carrier recovery, timing clock recovery, and channel equalization process, thereby enhancing the receiving performance of the receiving system.
摘要:
Nonzero elements of a signal vector, which may be a sparse signal vector, may be determined based on an observation vector representing a set of underdetermined observations using a compressed sensing optimization and a non-underdetermined estimation method such as iterative linear minimum mean-square error ("LMMSE") estimation. Compressed sensing optimization may be used to obtain a subset of potentially nonzero elements of the signal vector, and LMMSE estimation may then be used to find the nonzero elements among the potentially nonzero elements. The identification of nonzero elements may then be used to recover the signal vector from the observation vector. This technique is useful for recovering compressed data such as a sparse frequency space representation of audio or video data from a measurement. The technique is also useful for identifying at a base station a relatively small number of active devices in an overloaded communication network.
摘要:
The current invention refers to wireless digital communications systems, particularly, to receivers with joint equalization, and joint phase-noise estimation and corresponding iterative methods which use the transmission technique based on single-carrier modulations combined with frequency-domain, equalization (SC-FDE) in presence of phase-noise and/or carrier frequency offsets (CFO).
摘要:
A sphere decoder based turbo equalizer is described. A method comprises assorting in a first vector Quadrature Amplitude Modulation,QAM,symbols on a particular tree level based on first distance properties, assorting in a second vector QAM symbols on the particular tree level based on second distance properties, selecting the QAM symbol with the minimum second distance property in the second vector, wherein said selecting comprises labeling the selected QAM symbol as protected, identifying the selected QAM symbol in the first vector assorted by distance properties, pruning the first vector by eliminating all QAM symbols having a larger first distance property compared to the selected QAM symbol, wherein said pruning is restricted to QAM symbols not being labeled as protected, and repeating the steps d-e selecting the QAM symbol with the next minimum second distance property.
摘要:
A method implemented by a receiver of a telecommunication device comprising receiving a signal y corresponding to an intended signal u being turbo-encoded, bits-to-symbols converted, and then sent on a MIMO time-dispersive channel having a dispersion matrix H, applying an interference-cleaning process on an initial signal Ŝ LIN comprising a spatial interference whitening, a MIMO joint detection, and then a turbo-decoding, subtracting from the initial signal Ŝ LIN a subtraction signal (Ḣ ISI Ŝ) determined by performing an interference-extracting process on the result of the application of the interference-cleaning process, determining an estimated signal û indicative of the intended signal u by performing the interference-cleaning process on the result of the subtracting.
摘要:
One aspect of the present invention concerns the management of processing resource allocations for a Turbo receiver, where such resources are consumed from a finite resource budget within a defined processing time interval. The contemplated Turbo receiver attempts to allocate more processing resources to those demodulation and/or Turbo decoding tasks that make more valuable contributions with respect to the ultimate goal of successfully decoding all data streams that are of interest in a received signal. The advantageous management approach allows the Turbo receiver to obtain better results for a given consumption of processing resources, and further permits the Turbo receiver to quit upon either achieving a successful outcome within a defined processing time interval or exhausting the budgeted resources.
摘要:
Teachings presented herein offer improved symbol block detection by including a decoder unit in a demodulation system. Utilizing a decoder unit in a demodulation system can significantly enhance symbol block detection because the decoder can produce bit likelihood values (soft bit values), and these bit likelihood values can be used to construct a set of candidate symbol values. Advantageously, this set of candidate symbol values is more likely to contain the actually transmitted symbol(s) than if the decoder unit was not used in the demodulation system.