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Extended Kalman Filter (EKF) can not only be used for tracking L1 signal under high dynamic, but also combine with semi-codeless techniques to track high dynamic L2 signal. And EKF can hold stability lock with semi-codeless in the ionospheric scintillation. The method of maximum a posteriori (MAP) estimation is used to estimate the unknown W-bit to overcome anti-spoofing (AS). EKF based semi-codeless...
Internet of things (IoT) is widely expected to be an important scenario in the fifth generation (5G) wireless network. Major challenges of IoT include the low cost of devices, low energy consumption, low latency and the ability to support a large number of simultaneous connections. In this article, a new type of non-orthogonal multiple access scheme called multi-user shared access (MUSA) is proposed...
A non-coherent 10Msps Ultra-Wideband (UWB) receiver using 3.1–5GHz pulse position modulation (PPM) signaling is implemented in a 65 nm CMOS process. The receiver is mainly comprised of low noise amplifier (LNA), squarer, integrator and comparator. All RF and baseband circuits operate at 0.5-V power supply. The chip area is 1.1mm×1.0mm. Total power dissipation is 7.44mW and 0.8nJ/bit can be achieved...
A multi-constellation GNSS RF front-end with an integer-N PLL has been implemented for Compass and GPS applications in a 0.35μm SiGe BiCMOS process. A LNA in common-emitter topology with a noise figure of 1.7dB is integrated on the chip. An inter-N PLL based frequency synthesizer is designed to generate different local oscillator (LO) signals for down-converting the received Compass/GPS signals in...
A configurable multi-band GNSS RF receiver with wide bandwidth in a heterodyne radio topology is implemented for Compass/GPS/Galileo applications in a 0.35μm SiGe BiC-MOS process. The receiver adopts a Σ − Δ fractional-N PLL to generate different local oscillator (LO) signals and down-converts GNSS signals in L1/B1/B2/B3/L1C/E1/E1b, c bands to an identical intermediate frequency (IF) of 46MHz. By...
A configurable Compass/GPS multiband GNSS RF receiver with wide bandwidth in a heterodyne radio topology is implemented in a 0.35μm SiGe BiCMOS process. By programming the synthesizer to generate different local oscillator (LO) signals, the proposed receiver downconverts GNSS signals in L1/B1/B2/B3 bands to an identical intermediate frequency (IF) of 46MHz. An automatic gain control (AGC) loop is...
A 46MHz centre frequency, 2.046MHz bandwidth 6th order Chebyshev-I band pass integrated filter using a biquad Gm-C structure is designed and implemented. Negative resistance cells are used in the biquad structure to obtain high Q of the filter. The Tran conductor has a high linearity with source degeneration technique using MOS resistors. The whole filter circuit is designed and simulated in 0.35µm...
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