Multicarrier constant envelope OFDM signal design for radar applications

2010 ◽  
Vol 64 (11) ◽  
pp. 999-1008 ◽  
Author(s):  
Reza Mohseni ◽  
Abbas Sheikhi ◽  
Mohammad Ali Masnadi-Shirazi
Keyword(s):  
Signal Design ◽  
Constant Envelope ◽  
Ofdm Signal ◽  
Radar Applications

A Unified Dual-frequency Constant Envelope Multiplexing Design Framework for Modernised GNSS Signals

2018 ◽  
Vol 71 (6) ◽  
pp. 1511-1530
Author(s):  
Tao Yan ◽  
Bo Qu ◽  
Ying Wang ◽  
Guoyong Wang ◽  
Wenying Lei ◽  
...  
Keyword(s):  
Design Method ◽  
Phase Relationship ◽  
Satellite System ◽  
Single Frequency ◽  
Design Framework ◽  
Signal Design ◽  
Dual Frequency ◽  
Binary Offset Carrier ◽  
Constant Envelope ◽  
Special Cases

In the field of modernised Global Navigation Satellite System (GNSS) signal design, several Dual-frequency Constant Envelope Multiplexing (DCEM) methods have been recently proposed. However, the existing DCEM methods, such as Alternative Binary Offset Carrier (AltBOC), generalised AltBOC and Asymmetric Constant Envelope Binary Offset Carrier (ACE-BOC), are only applied in some special cases. In this paper, we present a unified DCEM design framework for GNSS signals. The existing DCEM methods can be unified in this framework. First, the signal components at two carrier frequencies are combined into two single-frequency constant envelope signals. Then, the linear sum of dual-frequency signals with non-constant envelopes is obtained. Finally, the linear sum is converted into the corresponding DCEM signal by solving an optimisation problem. The proposed design framework has no strict constraints on the number, power ratio and phase relationship of the signal components. Moreover, some special design cases under this framework are also analysed in detail. The analytical results show that the proposed design method can reach higher multiplexing efficiency compared with the existing methods. Based on the proposed method, we suggest a scheme to multiplex the BeiDou regional signals and global signals at the B2 frequency. The simulation results of correlation functions and Power Spectrum Density (PSD) verify the correctness and effectiveness of the proposed design method.

QAM MAPPED OFDM SIGNAL PROCESSING ON RADAR APPLICATIONS

2014 ◽  
Vol 73 (6) ◽  
pp. 529-535
Author(s):  
H. Avagyan ◽  
A. Hakhoumian ◽  
Kh. Tovmasyan
Keyword(s):  
Signal Processing ◽  
Ofdm Signal ◽  
Radar Applications

Phase-aligned Dual-frequency Constant Envelope Multiplexing Technique for GNSS Signals

2018 ◽  
Vol 71 (4) ◽  
pp. 899-918
Author(s):  
Zhihui Zhou ◽  
Zuping Tang ◽  
Jiaolong Wei ◽  
Xuan Xia ◽  
Tao Yan
Keyword(s):  
Phase Relationship ◽  
Global Navigation Satellite Systems ◽  
Lookup Table ◽  
Signal Design ◽  
Dual Frequency ◽  
Binary Offset Carrier ◽  
Signal Model ◽  
Frequency Signal ◽  
Satellite Systems ◽  
Constant Envelope

In the new generation of Global Navigation Satellite Systems (GNSS), dual-frequency constant envelope multiplexing is widely desired and is becoming an important subject in signal design. Considerable work has been devoted to multiplexing for the Alternative Binary Offset Carrier (AltBOC)-like signal model, for which each sideband consists of two or fewer signal components. In this paper, a phase-aligned dual-frequency constant envelope multiplexing technique is proposed for a general dual-frequency signal model. This multiplexing technique can be used to combine two constant-envelope-modulated signals in two sidebands into a composite signal with a constant envelope, where the constant-envelope-modulated signal in each sideband consists of an arbitrary number of signal components with an arbitrary power ratio and phase relationship among the signal components. A Lookup Table (LUT)-based signal generation method is also proposed, for which the required driving clock rate of the signal generator can be flexibly adjusted to meet the requirements of the satellite payload. Applications for the AltBOC-like signal model and a general dual-frequency signal model in the Beidou B1 band validate the flexibility and high multiplexing efficiency of our method. Specifically, AltBOC is a special case of the proposed method.

scholarly journals Multiplexing modulation design optimization and quality evaluation of BDS-3 PPP service signal

2022 ◽  
Vol 3 (1) ◽  
Author(s):  
Cheng Liu ◽  
Zheng Yao ◽  
Dun Wang ◽  
Weiguang Gao ◽  
Tianxiong Liu ◽  
...  
Keyword(s):  
Average Length ◽  
Large Diameter ◽  
Satellite System ◽  
Transmission Efficiency ◽  
Actual State ◽  
Signal Design ◽  
Binary Offset Carrier ◽  
Modulation Technique ◽  
Constant Envelope ◽  
S Curve

AbstractThe Precise Point Positioning (PPP) service of BeiDou-3 Navigation Satellite System (BDS-3) is implemented on its Geostationary Earth Orbit (GEO) satellites. However, its signal design is limited by the actual power of satellite and other conditions. Furthermore, the design needs to fully consider the compatibility of different service phases. Starting from the actual state of the BDS-3 GEO satellite, this paper studies the multiplexing modulation of the BDS PPP service signal that is based on the Asymmetric Constant Envelope Binary Offset Carrier (ACE-BOC) technique and proposes several feasible schemes for this signal. Comparison and optimization of these techniques are made from the aspects of transmission efficiency, multiplexing efficiency, and service forward compatibility. Based on the Type-III ACE-BOC multiplexing modulation technique, phase rotation and intermodulation reconstruction techniques are proposed to suppress the intermodulation interference issue. Finally, a signal based on improved ACE-BOC multiplexing is designed. The quality of the proposed signal was continuously monitored and tested using large-diameter antennas. The evaluation results show that the power spectrum deviation of the signal is 0.228 dB, the correlation loss is 0.110 dB, the S-curve slope deviation is 1.558% on average, the average length difference between the positive/negative chip and the ideal chip is only 0.0006 ns, and the coherence between the carrier and the pseudo code is 0.082°. All quality indicators are satisfactory, indicating that the proposed signal multiplexing modulation technique is an ideal solution that meets all the requirements of the design constraints, and can achieve efficient information broadcasting and forward compatibility of the BDS PPP service.

Design of OFDM Signal with Good Autocorrelation for Ground Penetrating Radar

Frequenz ◽  
2015 ◽  
Vol 69 (7-8) ◽  
Author(s):  
Shi Zheng ◽  
Xuehan Pan ◽  
Anxue Zhang ◽  
Yansheng Jiang ◽  
Wenbing Wang
Keyword(s):  
Ground Penetrating Radar ◽  
Orthogonal Frequency Division Multiplexing ◽  
Side Lobe ◽  
Main Lobe ◽  
False Alarms ◽  
Main Function ◽  
Signal Design ◽  
Ofdm Signal ◽  
Periodic Autocorrelation ◽  
Ground Penetrating

AbstractOrthogonal frequency division multiplexing (OFDM)-based ground penetrating radar (GPR) has been proved to have a number of advantages. To improve the performance of a GPR system, time domain non-periodic autocorrelation (AC) of the transmitted OFDM signal should be designed to have similar shape to an ideal pulse. Challenge in OFDM signal design for GPR is that there is little pertinent literature and the design should be different from that in communication and air radar fields. In this paper, we propose a design scheme of OFDM signal with good AC for GPR. We divide the AC into main lobe and side lobe with proving that the main lobe is dominated with the functionality of the modulating amplitudes while the side lobe’s main function is modulating phases. Thus, modulating amplitudes and phases can be designed, respectively. Performance of this proposed approach is demonstrated by numerical examples. The results show that the designed OFDM signal yields a better AC and fewer false alarms for GPR systems.

A Constant Envelope OFDM Signal Generation Algorithm Based on Frequency Domain Noise Shaping

2014 ◽  
Vol 602-605 ◽  
pp. 3156-3159
Author(s):  
Qing Shui Gu ◽  
Chen Wei
Keyword(s):  
Power Amplifier ◽  
Time Domain ◽  
High Efficiency ◽  
Sampling Rate ◽  
Signal Generation ◽  
High Signal ◽  
Noise Shaping ◽  
Sigma Delta Modulation ◽  
Constant Envelope ◽  
Ofdm Signal

Presents a OFDM signal generation method which transforms general OFDM signal to constant envelope signal. Through out-of-band of original OFDM signal insertion synthetic noise signal, the composite signal in time domain is constant envelope, and in in-band can achieve a high signal-to-noise ratio. Simulations show that the method can be used in OFDM system to improve the efficiency of power amplifier. Simulations show that the method does not need too high sampling rate, at the same time there is no stability problems, compared to the high efficiency power amplifier based on time-domain Sigma-Delta modulation technology.

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