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Due to the existence of multiuser interference, codes optimized for point-to-point links may be unsuitable for multiuser networks. In this paper, we are concerned with the design of low-density parity-check (LDPC) codes for binary-input Gaussian interference channels (GIFC). We utilize a Monte-Carlo approach based on the downhill-simplex algorithm to obtain good LDPC degree distributions for GIFC...
In this paper, we apply q-ary LDPC codes to differential modulation systems, and study the design and performance of the resultant coded modulation systems. Two low-complexity joint detection-decoding methods for noncoherent demodulation are proposed, in which the hard-message-passing strategy is used for a joint factor graph. The first method is based on the joint detection-decoding algorithm introduced...
This paper is concerned with Gaussian interference channels (GIFC) in which all transmitters are coded with binary low-density parity-check (LDPC) codes. We focus on the design of decoding algorithms. The main contributions of this paper include: 1) we present three types of iterative decoding algorithms (IDA), which are computing-decoding type, decodingcomputing type and computing-decoding-computing...
The influence of the pre-existing void in the Cu/Sn-58Bi/Cu solder joint on electromigration behavior was investigated by in-situ SEM observation and focused ion beam (FIB) analysis. The results show that the void with smooth internal surface has no influence on the Bi atom migration, while the one with a sharp notch may easily result in Bi atom congregation and further lead to the formation of cracks...
In this paper, we apply q-ary LDPC codes to differential modulation systems, and study the design and performance of the resultant coded modulation systems. A low-complexity joint detection/decoding method for noncoherent demodulation is proposed, in which the hard-message-passing strategy is used for a joint factor graph. It combines trellis-based differential detection aided with channel prediction...
The rapid development of modern electronic devices and products has proposed a great demand for the continuous scaling down in the dimension of solder joints and interconnect pitches in packaging; accordingly the current density in solder interconnects gets higher and higher. The higher current density can easily result in electromigration (EM) which has been regarded as a serious reliability issue...
The microstructural evolution and mechanical behavior of line-type Ni/Sn3.0Ag0.5Cu/Ni interconnects with a small thickness (or height) of 100 µm during isothermal aging were investigated. Microstructural analysis shows that both (Ni,Cu)3Sn4 and (Cu,Ni)6Sn5 IMC phases formed at the interface of the as-reflowed joints; however, after the aging treatment at 125 °C for 100 h or more, the interfacial (Cu,Ni)...
The dimension of solder micro-interconnects has been scaling down to meet the trend of miniaturization of electronic products and devices. In this study, Cu/Sn-0.7Cu-0.05Ni (SCN)/Cu sandwich solder joints with a very small thickness (or height), in the range of 10 to 100 µm, were prepared and the size effect on the microstructure and mechanical behavior of the joints were investigated systematically...
In this paper, we propose a new joint source-channel coding (JSCC) method for transmission of a Gaussian source through an additive white Gaussian noise (AWGN) channel whose bandwidth is higher than that of the source. Firstly, a sequence of random variables from a Gaussian source is discretized with a lattice-based quantizer, resulting in a sequence of lattice points. Secondly, by driving an encoder...
In this paper, we present a low-complexity joint detection-decoding algorithm for nonbinary LDPC coded-modulation systems. The algorithm combines hard-decision decoding using the message-passing strategy with the signal detector in an iterative manner. It requires low computational complexity, offers good system performance and has a fast rate of decoding convergence. Compared to the q-ary sum-product...
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