scholarly journals A Carrier Parameter Decoupling Algorithm for High Order APSK Modulation

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Xiangchuan Gao ◽  
Xupeng Zhang ◽  
Linlin Duan ◽  
Kexian Gong ◽  
Peng Sun ◽  
...  
Keyword(s):  
Parameter Estimation ◽  
Phase Shift ◽  
Satellite Communication ◽  
Frequency Offset ◽  
Original Method ◽  
Phase Shift Keying ◽  
Carrier Synchronization ◽  
Modulation Mode ◽  
Shift Keying ◽  
Decoupling Algorithm

In satellite communication, carrier parameter estimation usually uses a serial structure, and the accuracy of frequency offset estimation (FOE) will greatly affect the accuracy of phase offset estimation (POE). A new carrier synchronization mode (NCSM) can realize the decoupling of carrier FOE and POE to a certain extent, but this mode is based on multibase phase shift keying (MPSK) modulation analysis, the decoupling performance is poor when uses in amplitude phase shift keying (APSK) modulation, and the decoupling performance of NCSM has a low tolerance of frequency offset. An improved carrier parameter estimation decoupling technique is proposed to solve these problems. The simulation results show that, compared with the original method, under the premise of ensuring the accuracy of carrier parameter estimation, the proposed method is more robust to the modulation mode, the POE has stronger antioffset ability, and the normalized FOE range has been significantly enhanced.

scholarly journals A Reduction of Peak-to-Average Power Ratio Based Faster-Than-Nyquist Quadrature Signals for Satellite Communication

Symmetry ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 346
Author(s):  
Sergey B. Makarov ◽  
Mingxin Liu ◽  
Anna S. Ovsyannikova ◽  
Sergey V. Zavjalov ◽  
ILya Lavrenyuk ◽  
...  
Keyword(s):  
Phase Shift ◽  
Satellite Communication ◽  
Average Power ◽  
Reduction Rate ◽  
Digital Television ◽  
Power Ratio ◽  
Phase Shift Keying ◽  
Quadrature Phase Shift Keying ◽  
Quadrature Phase ◽  
Shift Keying

The increase in the throughput of digital television and radio broadcasting (DVB) channels can be achieved due to application of signals with a compact spectrum and a relatively small peak-to-average power ratio (PAPR). The reason is the usage of traveling wave tubes (TWT) for amplifying and transmitting signals from a satellite repeater in DVB-S2X systems. At the same time, given that the bandwidth allocated for transmission should be used as efficiently as possible, a high reduction rate of out-of-band emissions level is required. The most effective solution in this direction is the transition to spectrum-economic signals, such as optimal Faster-Than-Nyquist (FTN) signals, which can provide a certain reduction rate of the out-of-band emissions level and minimum acceptable PAPR. This article proposes a method for obtaining optimal FTN pulses, which have symmetry in time domain, with specified PAPR and reduction rate of out-of-band emissions for the quadrature phase shift keying (QPSK) and offset quadrature phase shift keying (OQPSK). The possibility of synthesizing signals with OQPSK modulation is presented theoretically for the first time. Optimal FTN signals can provide PAPR reduction by at most 3 dB and outperform known root raised cosine (RRC) pulses. The simulation model adopts an architecture for quadrature generation of optimal FTN signals with OQPSK modulation with blocks for adjustable pre-amplification, clipping, and power amplification. The proposed signals can be used to increase the spectral and energy efficiencies of satellite broadcasting systems, such as DVB-S2/S2X, as well as low-rate return channels of interactive broadcasting systems with a frequency resource shortage.

Implementation of Costas Loop for BPSK Receivers Using FPGA

2012 ◽  
Vol 263-266 ◽  
pp. 990-993
Author(s):  
Si Yu Guo ◽  
Dong Hai Qiao ◽  
He Ming Zhao
Keyword(s):  
Phase Shift ◽  
Phase Shift Keying ◽  
Carrier Synchronization ◽  
Binary Phase ◽  
Functional Simulation ◽  
Shift Keying ◽  
Fpga Chip ◽  
Costas Loop ◽  
Binary Phase Shift Keying

This paper introduced a scheme of BPSK (Binary Phase Shift Keying) carrier synchronization based on all digital Costas loop. The principle and implementation of every module used in Costas loop were demonstrated in detail and some of them were optimized to shorten the carrier recovering time. The functional simulation with the ModelSim shows the digital Costas loop works well and its carrier synchronization could be reached in only several cycles. The proposed Costas loop are implemented in FPGA chip and verified by Altera built-in SignalTap logic analyzer. For the implementation with Altera Cyclone IV EP4CE115F29C7N chip, the entire digital Costas loop only occupies a very small part of FPGA resources.

scholarly journals Power Estimation of QPSK and BPSK Modulation Systems for FPGAs based on IP Modeling for Wireless Applications

2021 ◽  
Author(s):  
Neerja Singh ◽  
Gaurav Verma ◽  
Vijay Khare
Keyword(s):  
Phase Shift ◽  
Communication Systems ◽  
High Performance ◽  
Satellite Communication ◽  
Power Estimation ◽  
Supervised Machine Learning ◽  
Phase Shift Keying ◽  
Estimation Model ◽  
Shift Keying ◽  
Bpsk Modulation

Abstract FPGA market has expanded due to its adoption in mobile phones and wearable devices. The communication IP blocks in Field Programmable Gate Array (FPGAs) has made it possible to realize different communication systems. However, in spite of their high performance, FPGAs suffers from high power consumption due to their complex architecture as compared to their ASIC counterpart. This has made power estimation as an important design metric. The existing commercial tools provide the option to estimate the power, but at the cost of longer estimation time as the designs have to follow the complete design cycle. Moreover, literature, mostly focuses on power estimation of individual blocks and power estimation of the complete system is still in infancy stage. Therefore, in this work, Quadrature Phase Shift Keying (QPSK) and Binary Phase Shift Keying (BPSK) modulation systems have been designed that are used in various wireless and satellite communication applications. Further, a new identity is proposed that could evaluate the power of whole system. The QPSK and BPSK systems have been designed via embedded IP and user-defined IP cores. A power estimation model of diverse blocks of QPSK and BPSK modulation systems have been developed based on a supervised machine learning technique using MATLAB R2016b and models are validated against commercial tool. Finally, the power of complete QPSK and BPSK modulation system is estimated using the proposed identity and is also validated for accuracy with reference to Vivado 2014.2 tool targeted to the Zynq family device and state of the art work. It has been seen from the results that the proposed identity outperforms in power estimation of complete systems as compared to existing identities available in literature and is providing aligned results with reference to the commercial tool.

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