Radio determination satellite service

Briskman, Robert D.

doi:10.1109/5.56925

Cited by 14 publications

(3 citation statements)

References 2 publications

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“…Here, we need to point out that data modulation might be inconvenient for the coherent accumulation algorithm. So, we assume that each transmitter sends a non-datamodulated section before its information-bearing segment in every burst frame [27], which is abbreviated as…”

Section: Mathematical System Model Of Synchronous Ds-cdma Channelmentioning

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

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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.

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Section: Mathematical System Model Of Synchronous Ds-cdma Channelmentioning

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

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“…As the first generation of BeiDou system, BeiDou-1 (BD1) is a radio determination satellite service (RDSS) system for regional positioning, user identification, location report and short message service (SMS) applications. The system is realized by a dual-way communication between users and the central control station via geostationary satellites [6], [7].…”

Section: Introductionmentioning

confidence: 99%

A CMOS RF BeiDou-1 Transceiver for Regional Positioning and Short Message Service Applications

Wang

Zhou

Yu³

et al. 2020

IEEE Access

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This paper presents a fully integrated CMOS radio-frequency (RF) transceiver for BeiDou-1, a radio determination satellite service system which can provide regional positioning and short message service. The proposed transceiver incorporates a low-IF receiver and a BPSK transmitter to realize a dualway communication between users and the central control station via satellites. The receiver (RX) RF frontend down-converts the 2491.75 MHz RF signals to a 12.24 MHz IF band with a bandwidth of 8.16 MHz. The complex band-pass filter utilizes passive compensation technique to compensate the phase lag and achieve in-band flatness. The 4.08 Mchip/s baseband signal alternatively selects one of the differential 1615.68 MHz local signals to achieve BPSK modulation for the transmitter (TX). Besides, on-chip low dropout regulators adopt improved power supply rejection ratio techniques by integrating active filtering to obtain stable 1.5 V supply voltages. The transceiver is fabricated in a 130 nm CMOS technology and occupies an area of 5.88 mm 2 with electrostatic discharge circuitry and pads included. The RX channel achieves a 106 dB maximum voltage gain with a 65 dB dynamic range, a 4.95 dB noise figure and a 46 dB image rejection ratio. The output power for the TX ranges from −10 dBm to 5 dBm, with a phase error less than 1.5 degree. INDEX TERMS BeiDou-1, RF transceiver, radio determination satellite service system, low-IF receiver, complex band-pass filter, on-chip low dropout regulators.

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“…Furthermore, the cellular network infrastructure is easily destroyed due to the natural calamities, which will result in that the location information cannot be transmitted to the outside in good season. Fortunately, as a unique part of GNSS, Beidou has both radio navigation satellite service [also known as Beidou(II)] and radio determination satellite service [also known as Beidou(I)], which can provide not only navigation but also message communication function [3]. It is almost not affected by the natural calamities and can improve the communication efficiency effectively to meet the LBS communication requirement at all distress occasions.…”

mentioning

confidence: 99%

Reconfigurable All-Band RF CMOS Transceiver for GPS/GLONASS/Galileo/Beidou With Digitally Assisted Calibration

et al. 2015

IEEE Trans. VLSI Syst.

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This paper presents a fully integrated reconfigurable all-band RF transceiver for GPS/GLONASS/ Galileo/Beidou in 55-nm CMOS. The transceiver incorporates three low-IF receivers (RXs) and one direct up-conversion BPSK transmitter (TX), which can be configured to receive any two global navigation satellite system (GNSS) signals or switched to process the Chinese Beidou(I) signals. A switching module is integrated to provide the connectivity between different RF front-end and IF channel (IFC), which will effectively simplify the design complexity of the IFC and save power consumption, while the GNSS signals are received. A flexible frequency plan with two frequency synthesizers is utilized to satisfy different local oscillator requirements of the transceiver. An optimized automatic frequency calibration scheme using an error compensation logic enables fast and high-precision calibration process for optimum phase-locked loop operation. Several digitally assisted calibration modules are integrated to ensure that the chip performance only shows a weak process, voltage and temperature (PVT) dependence. While drawing about 21.5-30.2 mA per RX channel from a 1.2-V supply, the RXs achieve an image rejection ratio more than 49 dB after I/Q mismatch calibration, an automatic gain control range of 88 dB, and an input-referred 1 dB compression point of better than −25 dBm with a minimum noise figure of about 2 dB. The output power of the TX is about 5 dBm with about 6% error vector magnitude (EVM) and 30-mA current from a 1.2-V supply. The whole transceiver consumes a die area of 2.8 × 3 mm 2 .

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Radio determination satellite service

Cited by 14 publications

References 2 publications

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

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

A CMOS RF BeiDou-1 Transceiver for Regional Positioning and Short Message Service Applications

Reconfigurable All-Band RF CMOS Transceiver for GPS/GLONASS/Galileo/Beidou With Digitally Assisted Calibration

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