Jianguo Yuan

• Chongqing University of Posts and Telecommunications

In this paper, a novel soft reliability-based iterative majority-logic decoding algorithm with uniform quantization is proposed for regularly structured low density parity-check (LDPC) codes. A weighted measure is introduced for each check-sum of the parity-check matrix and a scaling factor is used to weaken the overestimation of extrinsic informat...

The higher peak-to-average power ratio (PAPR) is a major shortcoming of coherent optical orthogonal frequency division multiplexing (CO-OFDM) systems. Selective mapping (SLM) technology can effectively reduce the probability of high PAPR, but it has higher computational complexity, and requires additional bandwidth to transmit the side information,...

A novel construction method of quasi-cyclic low-density parity-check (QC-LDPC) codes is proposed based on Chinese remainder theory (CRT). The method can not only increase the code length without reducing the girth, but also greatly enhance the code rate, so it is easy to construct a high-rate code. The simulation results show that at the bit error...

A novel lower-complexity construction scheme of quasi-cyclic low-density parity-check (QC-LDPC) codes for optical transmission systems is proposed based on the structure of the parity-check matrix for the Richardson-Urbanke (RU) algorithm. Furthermore, a novel irregular QC-LDPC(4 288, 4 020) code with high code-rate of 0.937 is constructed by this...

According to the requirements of the increasing development for optical transmission systems, a novel construction method of quasi-cyclic low-density parity-check (QC-LDPC) codes based on the subgroup of the finite field multiplicative group is proposed. Furthermore, this construction method can effectively avoid the girth-4 phenomena and has the a...

Because the partial transmit sequence (PTS) peak-to-average power ratio (PAPR) reduction technology for optical orthogonal frequency division multiplexing (O-OFDM) systems has higher computational complexity, a novel two-stage enhanced-iterative-algorithm PTS (TS-EIA-PTS) PAPR reduction algorithm with lower computational complexity is proposed in t...

This paper presents a novel approach for constructing structured regular QC-LDPC codes based on a special type of combinatorial designs,known as the balanced incomplete block design (BIBD).The code design approach based on the technology of block cyclic shift and dispertion (BCSD) for correcting erasure-bursts over the binary bursts erasure channel...

In order to improve the energy consumption efficiency of the distributed antenna system, a model of the cooperative multipoint transmission (CoMP) system was established. The channel propagation model, the energy consumption evaluation index and the system coverage, and the relationship existed in the distance between base stations and system energ...

To solve the large noise problem for the low-precision gyroscopes in micro-electro mechanical systems (MEMS) of inertial navigation system, an improved noise reduction method, based on the analyses of the fast Fourier transformation (FFT) noise reduction principle and the simple wavelet noise reduction principle, was proposed. Furthermore, the FFT...

In order to improve the acquisition sensitivity of global navigation satellite system (GNSS), the acquisition strategy of GPS system is studied. A novel GPS double-peak-value ratio acquisition strategy is proposed by analyzing traditional double-peak-value ratio acquisition system. This novel acquisition strategy is based on the thought of combinin...

Considering the limited performance of the traditional Gray mapping at medium-to-high signal noise ratio (SNR) region, a novel constellation mapping scheme of 16 quadrature amplitude modulation (QAM) is proposed by redistributing bit position in order to optimize performance at medium-to-high SNR region for Bit-interleaved coded modulation with ite...

According to the defect of the high peak-to-average-power-ratio (PAPR) in optical orthogonal frequency division multiplexing (O-OFDM) systems, the selected mapping (SLM) method for PAPR reduction technologies has been deeply studied. An improved PAPR reduction technology, which combines the idea of the second PAPR selection and the low-complexity S...

A novel hard decision decoding scheme based on a hybrid intelligent algorithm combining genetic algorithm and neural network, named as genetic neural-network decoding (GND), is proposed. GND offsets the reliability loss caused by channel transmission error and hard decision quantization by making full use of the genetic algorithm's optimization cap...

In order to accelerate the acquisition speed of the global positioning system (GPS) and improve the acquisition sensitivity of the system, the acquisition strategy of the GPS system is studied. The basic principle of the acquisition system and the traditional maximum acquisition system are analyzed, and a novel GPS multiple-peak-value acquisition s...

Combining the advantages of both the genetic algorithm (GA) and the chase decoding algorithm, a novel improved decoding algorithm of the block turbo code (BTC) with lower computation complexity and more rapid decoding speed is proposed in order to meet the developing demands of optical communication systems. Compared with the traditional chase deco...

Based on the theoretical analysis of both the characteristics for the concatenation code and the two concatenation code-types in ITU-T G.975.1, a new RS(255,223) + BCH(2040,1930) concatenation code for optical communications is constructed and analyzed. The simulation results show that this new concatenation code, compared with the RS(255,239)+CSOC...

Based on Galois Field (GF(q)) multiplicative group, a new coding scheme for Quasi-Cyclic Low-Density Parity-Check (QC-LDPC) codes is proposed, and the new coding scheme has some advantages such as the simpler construction, the easier implementation encoding, the lower complexity of the encoding and decoding, the more flexible adjustment of the code...

A phase noise inter-carrier interference (ICI) suppression algorithm based on the Wiener filter is proposed so as to solve the ICI problem caused by the phase noise in the coherent optical orthogonal frequency division multiplexing (CO-OFDM) communication systems. The proposed algorithm can effectively suppress the effect of the ICI at the conditio...

In coherent optical orthogonal frequency-division-multiplexing (CO-OFDM) receivers, the phase noise caused by the instabilities of the local oscillator is a potentially serious problem. In order to deal with the common phase error (CPE) caused by the phase noise in actual CO-OFDM receiver, a novel two-stage Least Mean Square (LMS) phase noise adapt...

An effective hierarchical reliable belief propagation (HRBP) decoding algorithm is proposed according to the structural characteristics of systematically constructed Gallager low-density parity-check (SCG-LDPC) codes. The novel decoding algorithm combines the layered iteration with the reliability judgment, and can greatly reduce the number of the...

According to the transmission characteristics of high-speed long-haul optical transmission system, the main construction method of Low-Density Parity-Check (LDPC) code for optical transmission system is presented and a novel construction algorithm of LDPC code is proposed, the theoretical analysis shows that the parity check matrix of the LDPC code...

A novel construction method of quasi-cyclic low-density parity-check (QC-LDPC) code is proposed based on the finite field multiplicative group, which has easier construction, more flexible code-length code-rate adjustment and lower encoding/decoding complexity. Moreover, a regular QC-LDPC(5334,4962) code is constructed. The simulation results show...

In order to meet the requirements of the high bit-rate and the lower bit error-rate of the error-correction code in optical communication systems, based on the balanced incomplete block design (BIBD) and the circulant decomposition in this paper, a novel construction method of quasi-cyclic low-density parity-check (QC-LDPC) codes with the advantage...

A new genetic probability decoding (GPD) algorithm to be fit for forward error correction (FEC) codes of optical communications, based on the genetic algorithm, is proposed through the characteristic analysis of optical communications. This novel algorithm can further optimize the matched filter's output of demodulator by applying the channel inter...

A novel RS(255,239)+BCH(3860,3824) concatenated code with 7.70% redundancy for long-haul optical transmission systems is constructed and analyzed through the theoretical analysis of the relevant concatenated code. The simulation analysis shows that the novel concatenated code, compared with the RS(255,239)+CSOC(k0/n0=6/7,J=8) code in ITU-T G.75.1,...

A novel construction method of the check matrix for the regular low density parity check (LDPC) code is proposed. The novel regular systematically constructed Gallager (SCG)-LDPC(3969,3720) code with the code rate of 93.7% and the redundancy of 6.69% is constructed. The simulation results show that the net coding gain (NCG) and the distance from th...

Based on the optimization and improvement for the construction method of systematically constructed Gallager (SCG) (4, k) code, a novel SCG low density parity check (SCG-LDPC)(3969, 3720) code to be suitable for optical transmission systems is constructed. The novel SCG-LDPC (6561,6240) code with code rate of 95.1% is constructed by increasing the...

In order to improve the decoding performance of low density parity check (LDPC) codes, a sum-product genetic decoding (SPGD) algorithm based on genetic algorithm (GA) is proposed. By means of the classical decoding algorithm of sum-product algorithm (SPA) of LDPC codes, variable node information generated by each hard decision of iteration is regar...

The algorithms and performances of the frame synchronization error estimation based on the traditional pilot arrangement in optical orthogonal frequency division multiplexing (OFDM) systems are thoroughly analyzed and studied. According to their disadvantages, a new algorithm based on block-type pilot arrangement of estimating the signal amplitude...

The bandwidth of phase-locked loop (PLL) in optical transponder unit (OTU) is affected by both the external input jitter and the internal phase noise jitter, so the selection for the bandwidth of the PLL has a contradiction and it is necessary that the bandwidth is optimally designed. Under the consideration of both the external input jitter and th...

After the development trend of high-speed long-haul optical communication systems and the theory of the concatenated code are analyzed, the comparative researches on the performances of the two concatenated codes of the inner-outer type and the improved interleaving type are performed in detail. The theoretical analyses and simulation results show...

Based on the genetic algorithm (GA), a new genetic probability decoding (GPD) scheme for forward error correction (FEC) codes in optical transmission systems is proposed. The GPD scheme can further offset the quantification error of the hard decision by making use of the channel interference probability and statistics information to restore the max...

Based on the construction method of systematically constructed Gallager (SCG)(4, k) code, a new improved construction method of low density parity check (LDPC) code is proposed. Compared with the construction method of SCG(4, k) codes improved before, the proposed construction method has some advantages, such as saving storage space and reducing co...

A novel ameliorated construction method of low density parity check(LDPC) codes, based on the construction method of Systematically Constructed Gallager(SCG) (4,k) code, is proposed. This method, compared with the construction method of SCG(4,k) code ameliorated before, has some advantages such as saving storage space and reducing computation compl...

According to the problem of the high peak-to-average power ratio (PAPR) in optical orthogonal frequency division multiplexing (OFDM) systems, the principle of PAPR reduction method by clipping is studied. Based on this principle, a clipping noise model of optical OFDM systems in the MQAM modulation is established by analyzing and computing a large...

The theoretical analysis and simulations on three kinds of synchronization algorithms for optical orthogonal frequency division multiplexing (OFDM) systems were performed. Based on simulation experiments, comparative analysis on the performance of the three algorithms for the timing metric, timing estimator and frame loss rate was carried out. The...

A novel Reed Solomon (RS) block turbo code (BTC) coding scheme of RS(63,58)×RS(63,58) for optical communications is proposed. The simulation results show that the net coding gain (NCG) of this scheme at the sixth iteration is more than that of other coding schemes at the third iteration for the bit error rate (BER) of 10−12. Furthermore, the novel...

A novel construction method with the advantages of simple construction and easy implementation encoding for quasi-cyclic low-density parity-check(QC-LDPC) codes based on Galois field (GF(q)) multiplicative group is proposed. This algorithm can flexibly adjust code length and code rate Furthermore, the complexity of the encoding and decoding is low....

In this paper, the performances of the hard-decision and the soft-decision decoding algorithms for BCH (Bose, Ray-Chaudhuri, Hocquenghem) codes are analyzed in theory firstly. Then the trellis structure of BCH codes is introduced and the Bahl, Cocke, Jelinek and Raviv (BCJR) algorithm based on trellis is deduced. The experimental results show that...

A novel construction method of quasi-cyclic low-density parity-Ccheck (QC-LDPC) codes is proposed. A sufficient condition of the construction approach for QC-LDPC codes without girth-four is presented. Considering the characteristics of optical communication systems, a QC-LDPC (4221, 3956) code for high-speed long-haul optical communication system,...

An adaptive algorithm of fine synchronization for coherent optical orthogonal frequency division multiplexing (CO-OFDM) transmission system is proposed. The whole synchronization is separated into two steps. In the first step, we use an auto-correlation-style algorithm to achieve the coarse symbol synchronization. In the second step, the proposed a...

When dealing with such complex systems such as the software package of a smart mobile phone, it is necessary to apply powerful methods to detect and report errors when they occur. This paper probes and analyzes a powerful debug method called trap and exception handling, which is supported by the ARM platforms. The method can easily capture some val...

A novel templateless AC electrochemical deposition method for controllable synthesis of gold nano/micro wire was proposed. Liner gold nanowires could be obtained by controlling the processing parameters, such as AC frequency, plating solution concentration, etc. Gold wire fabricated by this method could connect the electrodes using oscillograph to...

The configuration of the hybrid amplifier (Raman Amplifier: RA+Erbium-Doped Fiber Amplifiers: EDFA) has been introduced and the restriction conditions of its optimum design have also been analyzed and discussed, and then the ASE noise and Rayleigh noise in Raman Amplifier (RA) as well as their influences on the Signal Noise Ratio (SNR) of the recei...

In systemic lupus erythematosus (SLE), T lymphocytes overexpress CD70 (TNFSF7 gene), leading to the synthesis of autoreactive IgGs. CD70 upregulation in SLE CD4⁺ T cells is associated with hypomethylation of TNFSF7 promoter. In this study, we explored histone modifications in the TNFSF7 promoter region in SLE CD4⁺ T cells, and characterized the eff...

A modified construction method of LDPC codes, based on the construction method of SCG(4, k) codes, is proposed. Compared with the traditional method, this novel method has such advantages as saving storage space and reducing computation complexity in the hardware realization. LDPC(5929, 5624) codes were constructed with a redundancy of 5.42% by usi...

The bandwidth and jitter of phase-locked loop (PLL) in optical transponder unit (OTU) are inevitably affected by the noises. After the main noise responses of PLL in OTU are separately calculated, and then the power spectrum density (PSD) of the output jitter noise in the loop can be obtained by applying the superposition principle. Basing on the a...

An EPON (Ethernet Passive Optical Network) system based on SSA (Static Slot Allocation) is discussed in detail. How to create a queue model in upstream scheme of the EPON system based on SSA and how to confirm appropriate parameters in OPNET are also probed. Furthermore, the simulation analysis on the performance of EPON system has been performed....

In the wireless sensor network (WSN), how the Network Mobility(NEMO) protocol application scheme is better combined with the WSN is studied to meet the demand of network group mobility. A virtual mobile WSN condition with NEMO is constructed in the simulation tool NS-2, and the comparative simulation analysis with the Mobile Internet Protocol V6 (M...

After the coupling equations of co-pumping, counter-pumping and bidirectional-pumping distributed Raman amplifiers (DRAs) are theoretically analyzed, the power distributions of these three DRAs are acquired with numerical analysis. The performance factors, such as net gain (NG), amplified spontaneous emissions (ASE) noise, double Rayleigh backscatt...

A novel key retrieval algorithm for phase-coding based on double-key segmented composite filtering(SCF) is proposed. During the recovering, at first the segmented phase mask(SPM) of SCF coding system was obtained by the known-plaintext attack. Then, according to the content of the mask, the affiliations of the phase mask were analyzed by Monte Carl...

The methods for an EPON(Ethernet Passive Optical Network) system based on SSA(static slot allocation) to combine with high burst data traffic are discussed. An upstream system scheme of the EPON system based on SSA is built with OPNET and simulations are performed to analyze the performance of the EPON system performance. The simulation result show...

The main construction methods of the forward error correction (FEC) code type for optical transmission systems are proposed and a novel super forward error correction (Super-FEC) concatenated code of RS(255,239)+BCH(2040,1930) to be applied for optical transmission systems is constructed after the characteristics of the concatenated code for optica...

A novel two end-nodes initiating restoration scheme for optical networks is proposed to further reduce the restoration time, which focuses on the defect resulted by only single end-node initiating restoration in the most of current restoration schemes. Under the proposed scheme using pre-computed route, the fault indication messages trigger the sou...

Based on the construction principles of the low-density Parity-check code (LDPC) for optical communication systems, a novel construction method of the LDPC code is proposed, and the novel LDPC (3969, 3720) code with 6.69% redundancy and the novel LDPC(8281, 7920) code with 4.56% redundancy are constructed. The simulation results show that the net c...

A novel super forward error correction (SFEC) coding scheme, based on the block turbo code (BTC) of Bose–Chaudhuri–Hocguenghem (BCH)(64,57)×BCH(64,57), in high-speed long-haul dense wavelength division multiplexing (DWDM) optical communication systems is proposed. The simulation results and its analyses show that the net coding gain (NCG) of the no...

The Amplified Spontaneous Emission (ASE) noise, equivalent spontaneous emission factor and equivalent noise factor for the Raman Amplifier (RA) as well as the respective impacts of the ASE noise, Rayleigh noise, optical fiber length and the switching gain in the RA on the Signal Noise Ratio (SNR) of optical receivers are theoretically analyzed, and...

The construction principle, application selection and error-correction performance of the forward error correction (FEC) code types to be applicable for optical communication systems have theoretically been analyzed. The main construction principles of the FEC code type for optical communication systems are proposed. Both the simulation analyses an...

The three concatenated coding schemes of the inner-outer type, the parallel type and the consecutive type to improve the current forward error correction (FEC) coding technologies are proposed for dense wavelength-division multiplexing (DWDM) systems, after introducing the development trend of DWDM optical communication systems. The concatenated co...

The existing noises, such as the noise to arising from the optical transmitter, the noise in the optical fiber, the Amplified Spontaneous Emission (ASE) noise in the optical amplifier and the noise coming from the optical receiver, in optical communication systems were analyzed and probed. Some noises in optical communication systems can be synthes...

Combined with the research on Anti-Spam technology, the feature selection algorithm in pretreatment of e-mail information and the method of applying machine learning technology to digital information classifier is analyzed. In view of the problem that mail message eigenvector is so huge, GACHI feature selection algorithm as pretreatment of informat...

The structures of the novel super forward error correction (Super-FEC) code type based on the concatenated code for high-speed long-haul optical communication systems are studied in this paper. The Reed–Solomon (RS) (255, 239) + Bose–Chaudhuri–Hocguenghem (BCH) (1023, 963) concatenated code is presented after the characteristics of the concatenated...

A novel concatenated code type of RS(255, 239)+BCH(1023, 963) is proposed after analyzing and studying the characteristics of the concatenated code for optical communication systems and the two super forward error correction(SFEC) code types in ITU-T G.975.1. The simulation results show that this novel code type, compared with the RS(255, 239)+ CSO...

A new super forward error correction (super-FEC) code type (viz: BCH (64, 57) × BCH (64, 57) code type) in optical communication systems, based on block turbo code (BTC), was proposed. The simulation results show that the net coding gain (NCG) of BCH (64, 57) × BCH (64, 57) code at the sixth iteration is 0.34 dB more than that of RS (255, 239)+ CSO...

In this paper, the three ameliorated new coding schemes of the Super-FEC (Forward Error Correction) concatenatedcodes (namely, the inner-outer concatenated-code, the parallel concatenated-code and the successive concatenated-code with interleaving) are proposed after the development trend of high-rate optical transmission systems and the defects of...

The amplified spontaneous emission (ASE) noise, equivalent Signal Noise Ratio (SNR) of optical receivers spontaneous emission factor, equivalent noise factor of the Raman amplifier (RA) and the influences of the ASE noise, Rayleigh noise, optical fiber length and switching gain of RA on are analyzed, and then the double Rayleigh backscattering nois...