Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"Soft-decision"”.
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Low-power discrete Fourier transform and soft-decision Viterbi decoder for OFDM receivers
… into the analog demodulator and the subsequent soft-decision Viterbi decoder without any quantization involved. In this way, we claim that redundant system complexity caused by the quantization process is eliminated, thus gives better power efficiency in wireless communication systems, …
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Performance analysis of the Link-16/JTIDS waveform with concatenated coding, soft decision Reed Solomon decoding and noise-normalization
… double-pulse structure, is considered both for soft decision (SD) RS decoding and for soft diversity combining with noise-normalization. Both coherent and noncoherent detection are considered. Based on the analyses, the alternative JTIDS waveform outperforms the original in all cases considered. …
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Coding Techniques for Linear Block Codes With Applications to Fault Identification
… channel reliability information is available, soft-decision decoding becomes attractive for many applications, since maximum-likelihood (ML) soft-decision decoding offers (roughly) 3 dB additional gain over algebraic decoding. Since ML soft-decision decoding is an NP-hard problem, we …
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Improved error control techniques for data transmission
… The choice falls mainly into two areas: hard-decision algebraic decoding, a computationally-efficient method, and soft-decision combinatorial decoding, which although more complex offers better error-correction. The work presented in this Thesis is intended to provide practical decoding …
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On the construction, dimensionality, and decoding of linear block code trellises
… the use of longer error control codes and soft-decision maximum-likelihood (ML) decoding. Unfortunately, the implementation of such techniques is limited by the computational requirements of the decoder. In this thesis, we consider several aspects of trellis-based ML, and 'near-ML', …
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Contributions to the decoding of linear codes over Z4
This thesis explores various hard and soft decision decoding techniques for linear codes over Z4, all of which, offer substantial coding gains over classical algebraic decoding. We focus only on codes which are free, i.e., (n, k, d) linear codes whose canonical images over GF(2) are (n, k) linear …
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Iterative Techniques Based on Energy Spreading Transform for Wireless Communications
… complexity of linear detectors. Either a hard or soft decision can be fed back to the interference-cancellation stage at the subsequent iteration. The soft-decision scheme prevents error propagation of the hard-decision scheme for a low SNR and improves the performance. We analyze the performance …
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Guessing Random Additive Noise Decoding in Coded Multiple-Input Multiple-Output Systems
… disjoint from the MIMO detector, we compare the soft-decision Ordered Reliability Bits GRAND (ORBGRAND) to CRC-Assisted Successive Cancellation List (CA-SCL) decoding of the CRC-Assisted Polar (CA-Polar) [105, 128] code found in the 5G New Radio standard. For this code, we find that ORBGRAND …
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Direct-form adaptive equalization for underwater acoustic communication
… is on applying concepts from inference and decision theory and information theory to provide an approach to deriving and analyzing adaptation algorithms. Limited work has been done so far on rigorously devising adaptation algorithms to suit a particular situation, and the aim of this thesis …
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Performance of GMSK and 7/4-DQPSK Modulations in Land Mobile Radio Channels
… modulation with frequency-offset diversity and soft decision Viterbi decoding. Based on the numerically computed bit error rate bound it was found that the combination of frequency- offset diversity and convolutional coding results in a very significant improvement compared to a simple …
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Direct-form adaptive equalization for underwater acoustic communication
… is on applying concepts from inference and decision theory and information theory to provide an approach to deriving and analyzing adaptation algorithms. Limited work has been done so far on rigorously devising adaptation algorithms to suit a particular situation, and the aim of this thesis …
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Design and testing of a real time simulation for Trellis Coded Modulation
… number of memory elements, v. For TCM schemes, soft decision decoding, based on euclidean distance, rather than hard decision decoding, based on hamming distance, is used. Ungerboeck developed a mapping of encoder bits to channel signals on a constellation diagram. The mapping is called mapping …
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Multiuser detection for CDMA systems with convolutional coding
… The first scheme is recommended due to its soft-decision estimation of transmitted signal and implementation considerations. The analytical results for the first scheme are presented. Simulation results for both of these two schemes are obtained and compared.
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Concatenation of Space-Time Block Codes with ConvolutionalCodes
… block coded systems utilizing both hard and soft decision decoding. Simulation results are presented and are compared with the analytical results.
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Self-concatenated coding for wireless communication systems
… binary rather than non-binary schemes, a soft decision demapper was introduced in order to exchange extrinsic information with<br/>the SECCC decoder. To analyse this information exchange 3D-EXIT chart analysis was invoked for visualizing the extrinsic information exchange between the …
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Designing Low -Power Communication Systems via Noise-Tolerance
We develop the soft-decision channel (SDC) model for deriving the lower bounds on energy dissipation of noisy digital systems. We compare the energy-efficiency bounds for domino and noise-tolerant dynamic circuits, and demonstrate that noise-tolerant techniques improve the energy-efficiency when …
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Efficient signal, code, and receiver designs for MIMO communication systems
… them with tilted-QAM codes using hard and soft decision decoding to obtain good performance at moderate SNR. These new systems are compared to orthogonal space-time coded systems, which we show to achieve near optimal performance at low SNR. We also examine traditional sequential versions …
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The realization of signal processing methods and their hardware implementation over multi-carrier modulation using FPGA technology. Validation and implementation of multi-carrier modulation on FPGA, and signal processing of the channel estimation techniques and filter bank architectures for DWT using HDL coding for mobile and wireless applications.
… FPGA chip, largely taken up by the FFT, IFFT and soft decision encoder. Secondly, a new wavelet-based OFDM system based on FDPP-DA based channel estimation is proposed as a reliable ECG Patient Monitoring System, a Personal Wireless telemedicine application. The system performance for different …
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