Serial-in encoders for quasi-cyclic low-density parity-check (qc-ldpc) codes are widely used. To provide flexible interfaces and reduce complexity, three parallel-in qc-ldpc encoders are proposed. One consists of shif...
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Serial-in encoders for quasi-cyclic low-density parity-check (qc-ldpc) codes are widely used. To provide flexible interfaces and reduce complexity, three parallel-in qc-ldpc encoders are proposed. One consists of shift-register-adder-accumulator (SRAA) circuits, the others consist of rotate-left-accumulator (RLA) circuits. It is shown that a partially parallel-in encoder is comparable to or even superior to a serial-in one based on the same circuits;an RLA-based encoder is preferable to a SRAA-based one with the same speed, whether they are partially parallel-in or fully parallel-in.
This paper explains the structure of a newly designed quarter-rate low density parity check (ldpc) code for the cloud transmission system, and presents its truncated performance under additive white Gaussian noise (AW...
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ISBN:
(纸本)9781467360470
This paper explains the structure of a newly designed quarter-rate low density parity check (ldpc) code for the cloud transmission system, and presents its truncated performance under additive white Gaussian noise (AWGN) channel. Since new quarter-rate ldpccode has fountain code's property, at the receiver, it can be decoded with truncated codeword for power saving and less latency under high signal to noise ratio (SNR) regions. By computer simulation, the truncated ldpccode shows the same or worse performance compared with the dedicated DVB-T2/S2 ldpccode.
Aiming at the security issue of big data, a new encryption scheme with data compression was designed, which is based on the coding theory. Combining with the theory of compression, a compressed encryption scheme based...
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ISBN:
(数字)9783319491486
ISBN:
(纸本)9783319491486;9783319491479
Aiming at the security issue of big data, a new encryption scheme with data compression was designed, which is based on the coding theory. Combining with the theory of compression, a compressed encryption scheme based on quasi-cyclic low density parity check code was proposed. Furthermore, the performance and security of the scheme are analyzed, and through analysis it demonstrates the superiority of the scheme for big data encryption.
The energy efficiency of error control scheme is very important because of the strict energy constraints of wireless sensor networks. Wireless sensor node requires simple error control schemes because of the low compl...
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ISBN:
(纸本)9783642272004
The energy efficiency of error control scheme is very important because of the strict energy constraints of wireless sensor networks. Wireless sensor node requires simple error control schemes because of the low complexity request of sensor nodes. Automatic repeat request(ARQ) and forward error correction(FEC) are the key error control strategies in wireless sensor networks. In this paper. we implemented the efficient qc-ldpc encoder which does not require matrix inversion to improve the complexity of the encoder. It is shown that the efficient qc-ldpc code obtained 17.9% and 36% Rain respectively in the mean number of transmission for the transmission power of -19.2dBm and -25dBm.
As a new technology to solve wireless communication security problems, covert communication can not only hide the transmitted secret information, but also hide the communication process. Therefore, it has become a hot...
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ISBN:
(纸本)9781728181813
As a new technology to solve wireless communication security problems, covert communication can not only hide the transmitted secret information, but also hide the communication process. Therefore, it has become a hot research issue in wireless communication security in recent years. Aiming at the problems of the square root law model in the practical process, this paper deduces and analyzes a constraint condition of the signal-to-noise ratio to measure the covert system. Thus, a covert communication model of OFDM system based on the combination of qc-ldpc and symbol spread spectrum is constructed. Through theoretical and simulation analysis methods, we respectively proved the Gaussian-like, low probability of detection characteristics of the model's radio frequency signal and the reliable communication performance of the system under low signal-to-noise ratio. It is proved that the model can successfully realize the covert communication with limited parameters.
This paper firstly briefed the basic concepts of N public key cryptosystem, RS code and qc-ldpc code, and then put forward the cascade cryptosystem with the RS code being the outer code and qc-ldpc code being the inte...
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This paper firstly briefed the basic concepts of N public key cryptosystem, RS code and qc-ldpc code, and then put forward the cascade cryptosystem with the RS code being the outer code and qc-ldpc code being the internal code. At last, the writer analyzed in detail the security and performance of the N cryptosystem based on double public key, and thus proved its better security and performance than the traditional public key cryptosystem based on error correcting code. In addition, it is also endowed with higher practicability in complex environment.
A serial-input serial-output encoder based on pipelined rotate-left-accumulator (RLA) circuits is designed for multi-rate Quasi-Cyclic Low-Density Parity-Check (qc-ldpc) codes of Chinese digital terrestrial/television...
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ISBN:
(纸本)9781479958368
A serial-input serial-output encoder based on pipelined rotate-left-accumulator (RLA) circuits is designed for multi-rate Quasi-Cyclic Low-Density Parity-Check (qc-ldpc) codes of Chinese digital terrestrial/television multimedia broadcasting (DTMB) standard. The RLA circuit can make the area usage economical, and the pipelined architecture can simplify the memory structure. The encoder is implemented on FPGA. Simulation results demonstrate that the design meets the requirement of DTMB standard with lower energy consumption and fewer hardware resources.
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