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In this article a brief description of a direct conversion receiver is given, sources of affected channels in such a receiver are examined. Practical methods for eliminating of affected channels of a real radio system are proposed.
This paper presents a 1/4-rate PAM4 receiver employing a sampling decoder with an adaptive variable-gain rectifier (AVGR) to achieve a bit efficiency of 1.38 pJ/bit. By concurrently performing gain adaptation and amplitude rectification for decoding the least significant bit (LSB), the proposed decoder greatly reduces power consumption compared with the conventional full-rate topology using three...
Carrier frequency offset often occurs between wireless transmitter and receiver due to mismatch between the local oscillator in each of them. Standard-compliant communication systems define outer limits of tolerance of this mismatch expressed in parts per million (PPM). For high throughput systems like IEEE 802.11ac, this tolerance range is quite narrow. To meet such stringent specifications, number...
This paper reviews a set of architecture and circuit techniques that have enabled data rates beyond 10Gb/s, and explores a range of design challenges and considerations as we move to higher data rates. In particular, we review ADC-based designs and their challenges and tradeoffs, including ADC resolution, oversampling ratio, and power consumption.
This paper presents a quadrature pulse-position modulation (Q-PPM) impulse radio (IR) system, and its novel transceiver architecture for E-band wireless communications. In the Q-PPM IR system, the wavelet of the transmitted signal is time-shifted by multiples of 3 ps from the periodic base position. This paper focuses on the receiver architecture for demodulation of the Q-PPM IR signal. The principle...
In this paper, we propose a new positioning method by using wireless local area network systems based on a principle of the Real Time Kinematic-Global Positioning Systems (RTK-GPS). The proposed method collects observations of the carrier phase at access points for double phase difference of the RTK-GPS by following the point coordination function of the IEEE 802.11 standard. We show some numerical...
This paper presents a new transceiver for impulse radio ultra-wideband (IR-UWB) systems. This work is related to CHIST-ERA SMARTER project (Smart Multifunctional Architecture and Technology for Energy aware wireless sensoRs) which address autonomous wireless sensors nodes. The ultra low-power transceiver consists of an on-off keying (OOK) modulator/demodulator and a pulse generator. To reduce power...
To satisfy the requirements of complex distributed power electronic system (PES) communication, this paper has proposed a single optic-fiber link data communication protocol based on the Manchester code due to an vacancy in the commonly-adopted protocols, analyzed the encoding and decoding principle of Manchester code, defined the formats of command frame and data frame, calculated the communication...
Although a number of asynchronous physical-layer network coding (PNC) schemes have been proposed, synchronous PNC may still be preferred for its simplicity. In this paper we propose a new symbol-level synchronization scheme which reduces the misalignment to less than one hardware clock cycle period. In addition, we prototype the proposed scheme on the Universal Software Radio Peripheral (USRP) platform...
An 80 Gb/s 4-level pulse amplitude modulation (PAM4) wireline receiver is presented in this paper. This receiver adopts quarter rate architecture to improve data rate and reduce power consumption. In order to reduce the complexity of the clock and data recovery (CDR) design, a voltage control oscillator (VCO) based CDR without reference clock is used. Furthermore, four BBPDs are used to sample the...
This paper reviews the hardware requirements of generalised single photon ADC-less receiver circuits for visible light communications. A receiver based on parallel banks of pulse combiners and pipelined adders is shown to provide over a magnitude of circuit area reduction over the generalised structure.
Satellite selection is an important technology in Global Navigation Satellite Systems (GNSS), for which the dilution of precision (DOP) serves as the key performance metric. Selecting a satellites set with lower DOP often results more accurate positioning and timing. In this paper, the characteristics of DOP for dual-GNSS constellations is studied, where an uncertain clock offset is assumed between...
This work presents an ultra-low power event driven wake-up receiver (WuRx) fabricated in a RF CMOS 130 nm process. The receiver consists of an off-chip lumped element matching network, an envelope detector, a decision circuit capable of detecting sub-mV baseband signal voltages and a clock source consuming 1.3 nW. This receiver has demonstrated a sensitivity of −72 dBm while consuming a total of 8...
After analyzing the shortcomings of existing synchronization methods based on GPS and the research status of synchronization for Crosswell Electromagnetic Imaging Logging Tool(CEMIT), a feasible synchronization method combined the actual conditions of CEMIT with the basis of existing research is proposed. First of all, GPS receiver provides a high accurate 1PPS, which received by Surface System, and...
A novel run-pause-resume (RPR) debug methodology that can achieve complete cycle-level granularity of debug resolution for multiple clock domain systems is proposed. With this methodology one can pause the normal operation of a system at any cycle of any clock domain and resume the system without causing any data invalidation problem. Bidirectional transactions among different clock domains are analyzed...
In the integrated navigation system, the carrier phase has higher accuracy than the pseudo-range, but it has the problem of the solution of integer ambiguity. This paper proposes a GPS/INS integrated navigation algorithm based on the double-difference of time/inter-satellite with carrier phase. First, the algorithm is used to eliminate the influence of ambiguity by the simplified time-differenced...
PPP (Precise Point Positioning) is a relatively new GNSS (Global Navigation Satellite System) method that enables position determinations using a single receiver. Being able to survey with a single receiver makes this approach more attractive and affordable than other GNSS positioning techniques. Since a single receiver is used, a drawback of this technique is propagation of errors such as orbit and...
The run-pause-resume (RPR) debug methodology allows one to pause the normal circuit operations, observe the internal states of flip-flops and then resume the normal operations for further debug process. Data invalidation is a major problem that needs to be addressed when debugging a multiple-clock design with this methodology. This problem occurs when flip-flops in a receiving clock domain capture...
This paper presents a time-interleaved pipelined-SAR converter targeting a multi-band mobile communication receiver. The input buffer is based on a super-source follower and linearized by selecting a specific bias current and drain bias resistor. Time interleaved sampling time mismatch is resolved by using a common sample and hold circuit, and gain mismatch is corrected by fine tuning respective subADC...
We considered the range of PPP online services that solve the problem of high-precision coordinates and receiver time scale shift determination for the RINEX daily records. The comparative estimation of exact indicators of position determination for different geoids is given. The results contains the recommendations for use the online PPP services to solve the problem of time scales comparison.
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