Low-Density Parity-Check Coded Direct Sequence Spread Spectrum Receiver Based on Analog Probabilistic Processing

Ding, Xuhui; An, Jianping; Zhao, Zhe; Bu, Xiangyuan; Yang, Kai

doi:10.1109/tvt.2021.3084939

Cited by 12 publications

(6 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Under the control of the FH synchronizer, the PN-sequence generators at both the transmitter and the receiver are synchronized, and the frequency synthesizer outputs the same carrier frequency. Therefore, we obtain the baseband signals with residual frequency offset and phase offset [10] . And the baseband signals are represented by 12 { , ,..., ,..., } iI = X x x x x , where ={ [1], [1],..., [ ]}…”

Section: System Model For Fh Communication Systemmentioning

confidence: 99%

See 1 more Smart Citation

A novel carrier tracking method for frequency-hopping system

Chen

Ding

Zhang³

et al. 2023

Ninth Symposium on Novel Photoelectronic Detection Technology and Applications

Self Cite

View full text Add to dashboard Cite

The frequency-hopping (FH) method is widely applied in broadband satellite communication systems because of its low interception rate and good anti-jamming performance. In order to design an FH system, the core issue to be considered is synchronization. For a frequency-hopping time-division multiple access (FH-TDMA) system set in satellite optical communication or satellite wireless communication with large orbital angular momentum (OAM), imperceptible changes in carrier frequencies due to the network properties of large bandwidth, low signal-to-noise ratio (SNR), and high-frequency will cause large equivalent doppler frequency shift of the baseband signal, manifesting ‘linear inconsistence’ in the FH pattern of the network. Furthermore, the receiver of such a system needs to be robust to adapt to complex and harsh environments of noise interference for the purpose of fast synchronization and tracking progress. This paper proposes an open-loop carrier synchronization and tracking method based on dichotomous iterations by establishing a maximum likelihood (ML) doppler frequency shift estimation model. This method realizes the multidimensional search for frequencies and phases at low SNR. Compared with traditional open-loop carrier synchronization methods, this method can be functional based on mere complex multiplications and additions and can realize high accuracy frequency offset estimation of data at normalized frequency offset within 4.8e-4.

show abstract

Section: System Model For Fh Communication Systemmentioning

confidence: 99%

“…Generally, ˆi f  is the frequency at which the periodogram of i y achieves its maximum [11] , and ˆi   follows by substituting ˆi f  into (10). In other words, how to locate the peak of the periodogram becomes the key problem.…”

Section: Estimation Of Frequency and Phase Offset Based On Maximum Li...mentioning

confidence: 99%

A novel carrier tracking method for frequency-hopping system

Chen

Ding

Zhang³

et al. 2023

Ninth Symposium on Novel Photoelectronic Detection Technology and Applications

Self Cite

View full text Add to dashboard Cite

show abstract

“…With the development of communication technology, the role of satellite communication systems in the military field is becoming more and more important, and the research on anti-jamming and high-speed satellite communication systems has become an important research direction in the field of satellite communication. FH communication technology has been widely used in military satellite systems due to its strong anti-interference, good confidentiality and mature technology [1] [2] . In a FH communication system, the carrier frequency used by both the transmitter and the receiver is no longer a single frequency, but is randomly hopped under the control of a pseudo-random sequence.…”

Section: Introductionmentioning

confidence: 99%

A novel open-loop timing synchronization algorithm for frequency-hopping system

Zhao

Ding

et al. 2023

Ninth Symposium on Novel Photoelectronic Detection Technology and Applications

Self Cite

View full text Add to dashboard Cite

Frequency hopping (FH) communication system is known as an important direction of research in the field of satellite communication. Timing synchronization, as the process in which signal timing error is eliminated, serves as the basis for the realization of FH synchronization and data transmission, enabling it to be one of the key technologies of the whole system. Due to the characteristics of short frame burst possessed by the FH system, it is required that the system should complete the detection and tracking of signal timing error quickly, which requires high performance of timing synchronization. Through the improvement in the Gardner timing error detection algorithm, as well as use of the shifting of sampling position and interpolation with fixed fractional interval, there is the design of an open-loop timing synchronization algorithm with low complexity and strong real-time performance. With this algorithm, the system can have a bit error rate (BER) lower than 10-7 and no data loss with a clock deviation of 1ppm. Experimental results demonstrate the performance of the algorithm, the algorithm ensures low complexity and no data loss during synchronization process.

show abstract

“…However, with the increase in the number of users, the concern for multi access interference (MAI) becomes more compelling within DS-CDMA systems [5]. MAI exists when a weak received signal is interfered with by one or more strong signals as expounded in [6,7].…”

Section: Introductionmentioning

confidence: 99%

Accumulation and Elimination: A Hard Decision-Based Multi-User Interference Cancellation Method in Satellite Communication System

Li,

Jin,

Zhao

et al. 2023

Electronics

Self Cite

View full text Add to dashboard Cite

With the increasing number of users in the Medium-Orbit (MEO) satellite communication system, multi-access interference (MAI) has become an important factor that restricts the reliability and capacity of the system. Additionally, the low carrier-power-to-noise-density ratio (C/N0) resulting from long-distance transmission poses a significant concern. The parallel interference cancellation (PIC) algorithm, utilized within the paradigm of multi-user detection (MUD), exhibits the capability to effectively mitigate the impact of MAI within the same system. Simultaneously, coherent accumulation serves as a means to substantially enhance the correct detection probability (Pcd) at low C/N0. In this study, a signal acquisition method for multi-user spread spectrum satellite receivers is proposed, which employs interference cancellation and coherent accumulation as its core mechanisms. Furthermore, we introduce a power estimation method based on the outcomes of signal acquisition, which can be integrated into the signal reconstruction module of PIC. Finally, we implement the aforementioned algorithms in both simulation and hardware platforms. Remarkably, we observe that when the interference-to-signal ratio (ISR) caused by MAI equals 20 dB, the improved algorithm attains a maximum Pcd of 0.95 within the high signal-to-noise ratio (SNR) region, closely approaching the theoretical limit for the bit error rate (BER). The experimental results prove the effectiveness and feasibility of the acquisition algorithm. In summary, the enhanced algorithm holds vast potential for widespread implementation in multi-user spread spectrum communication systems.

show abstract

Low-Density Parity-Check Coded Direct Sequence Spread Spectrum Receiver Based on Analog Probabilistic Processing

Cited by 12 publications

References 32 publications

A novel carrier tracking method for frequency-hopping system

A novel carrier tracking method for frequency-hopping system

A novel open-loop timing synchronization algorithm for frequency-hopping system

Accumulation and Elimination: A Hard Decision-Based Multi-User Interference Cancellation Method in Satellite Communication System

Contact Info

Product

Resources

About