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An iterative detection/decoding algorithm of correlated sources for the LD-PC-based relay systems is presented. The signal from the source-destination (S-D) link is formulated as a highly correlated counterpart from the relay-destination (R-D) link. A special XOR vector is defined using the correlated hard decision information blocks from two decoders and the extrinsic information exchanged between...
In the tornado code, cascading with traditional erasure codes (mostly Reed-Solomon codes) is always used to protect the last level, which will enhance the erasure correcting performance. However, this method increases the complexity in the process of encoding and decoding. In this paper, we introduce an improved algorithm to get linear coding complexity and simplify the implementation of decoder in...
Decoding of Raptor codes consists of decoding of both the LT part and the precode part of the codes. When LT decoding is performed, a scenario may arise where the message passing-based decoding process is unable to provide non-zero log-likelihood ratio (LLR) updates to a fraction of input symbols even if it is mathematically possible to do so. The problem is even more critical for codes with short...
Satellite communication plays an important role in the ubiquitous global communication. However, for a long time, the communication provided by satellite suffers from serious signal attenuation and transmission delay. Conventional techniques such as HARQ couldn't provide timely service unless powerful channel codes are used. Once channel code fails, retransmission will be inevitable, and unbearable...
In this letter, we propose a new cross-level decoding method for LT codes, where the results of packet-level decoding are fed back to bit-level decoding to improve the overall decoding performance. Another advantage of our method is that it keeps the original LT decoder structure and does not require extra real field computation. We provide the revised And-Or Tree analysis for the proposed method...
Belief propagation (BP) algorithm has been widely used for decoding LT codes. It is well known that the premature termination of the BP decoding due to the lack of degree one symbols in the ripple impairs the decoding performance of the code. This problem has been well studied and tackled for binary erasure channel (BEC). However, for binary input additive white Gaussian noise (BIAWGN) channels, the...
Vision field describes the real world visual information by summarizing the seven-dimensional plenoptic function into three domains: view, light, time, from which a better understanding of previous 3D capture and reconstruction systems can be provided. In this paper, we first show how to reconstruct 3D spatial information from all the three attributes of the vision field, namely full-space vision...
In this paper, we consider a scenario that multiple users transmit data to a common destination node with the help of one relay station. We present one coding matrix that is invertible in the finite field and has maximum information spreading. We analyze the performance based on the input-out weight enumerate function (IOWEF) of the relay coding matrix and show a close match with the results of log-likelihood...
In this paper we investigate the effect of power allocation on the performance of the Distributed Turbo Product Code (DTPC) system. We study the error propagation on distributed coding systems when the relay makes erroneous decisions and present a simple power allocation method to alleviate the effect of relay decoding errors on the iterative decoding at the destination. We validate this method with...
Adoption of relay stations has been commonly accepted as a key technique for future IMT-advanced 4G systems to improve the link performance. While study in relay systems is often carried out for individual users independently, in this paper, we present a design termed as relay-based multi-user cooperative communication specifically for the uplink of 4G systems. In this system, data streams from multiple...
Differential encoding used in conjunction with sequence decoding is a primary method to implement high performance noncoherent demodulation. Though noncoherent decoding based on serially concatenated convolutional codes (SCCC) with differential encoding is almost similar to coherent demodulation in performance, its high decoding complexity makes its engineering application difficult. To solve this...
In this paper, a serial concatenated scheme combining USTM with LDPC codes over GF(2m) is presented. A modulation technique of USTM, Unitary space-time modulation, can efficiently work on decoding when the channel state information is unknown at the receiver in multi-input multi output system over flat raleigh fading channel. The BER performance of USTM system in MIMO channel will largely be improved...
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