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A 400-MHz 10-Mbps differential BPSK (D-BPSK) transceiver is presented. The receiver adopts a dynamic phase-to-amplitude conversion technique, which converts signal phase transition to amplitude variation. In the transmitter, phase modulated signal is realized by edge combining appropriate phases via an array of phase MUXs. Fabricated in 0.18-μm CMOS process, the receiver accomplishes −63dBm sensitivity...
This paper reports a power-efficient equalizing receiver designed for multi-data rate serial link applications. It includes a continuous-time linear equalizer (CTLE) and a halfrate 1-tap speculative decision feedback equalizer (DFE). The proposed StrongArm latch-based DFE adopts a novel non-50% duty-cycle clocking scheme to achieve 20% higher speed compared with the conventional 50% duty-cycle clocking...
A PAM4 serial I/O receiver efficiently implements a decision feedback equalizer (DFE) that employs 1-FIR and 2-IIR taps for first post-cursor and long-tail ISI cancellation, respectively. The use of a single-clock phase two-stage regenerative comparator simplifies the quarter-rate receiver design and allows for sufficient gain to support PAM4 DFE. Optimization of the direct-feedback design's timing...
IR-UWB communication systems have become popular for Wireless Body Area Network (WBAN) applications in recent times. This paper presents the development and testing of an IR-UWB coordinator node that includes an IR-UWB receiver front-end and a Field Programmable Gate Array (FPGA) based controller. The IR-UWB receiver front-end down converts the high frequency (3.5–4.5 GHz) IR-UWB pulses using a mixer...
A receiver circuit employing a dynamic linear equalization technique is presented. The new circuit method removes the traditional continuous-time linear equalizer (CTLE) and builds equalization into strong-arm latches (SALs). Fabricated in a 22-nm CMOS technology, the receiver's performance is experimentally verified at 11 Gb/s with better than bit error rate $10^{-12}$ at 0.17 mW/Gb/s power efficiency,...
A serial I/O receiver efficiently implements a decision feedback equalizer (DFE) employing 2 IIR taps for improved long-tail ISI cancellation. The use of a modified multi-input two-stage slicer allows for both DFE summation to be performed directly at the slicer and optimization of the first-tap IIR filter/mux feedback path to allow for cancellation of the critical first post-cursor. Fabricated in...
This work examines the idea of dislocating the carrier transmission from the tag-modulated carrier reception, i.e. bi-static rather than mono-static backscatter radio. In that way, more than one carrier transmitters can be distributed in a given geographical area and illuminate a set of RF tags/sensors that modulate and scatter the received carrier towards a single software-defined receiver. The increased...
DC-offset and 1/f noise are serious deficiencies of zero-IF receiver that it is limited in the application. A novel zero-IF receiver solution is presented to solve the problems about the DC-offset and 1/f noise of zero-IF. A receiver of the 915MHz SAW reader is designed, basing on the novel solution. The simulation platform of the circuit model and the communication system model are built under the...
Mixed-signal modules are being used extensively in real-time cyber-physical system design. Such real-time systems experience large changes in workload. In addition, due to the use of aggressively scaled silicon technologies, the nominal performances of ICs used in the design can vary significantly from IC to IC and within each IC from one corner of the IC to another. The key hypothesis of this research...
In this paper, a new trend of Space Time Block codes-Orthogonal Frequency Division Multiplexing (STBC-OFDM) with Convolutional and Turbo codes. The applied method is based on Alamouti's scheme. We examine the performance of two, three and four transmitters with one receiver over Nakagami-m fading channel using convolutional and turbo codes using different types of modulation such as BPSK and 64-QAM...
Extended balanced space-time block coding (EBSTBC) is able to achieve large coding gain and guarantee full diversity for any number of transmit antennas. However, the calculation of feedback information at the receiver employs exhaustive searching scheme which is at a high complexity. In this work, a low-complexity calculating scheme of feedback information is proposed for the receiver in EBSTBC systems...
Traditional transmitted reference (TR) systems for Ultra-Wideband (UWB) communications separate the reference and data-modulated signals in the time domain, thus requiring at the receiver a delay component which is difficult to implement. To circumvent this drawback, frequency-shifted reference (FSR-TR) systems employ an analog carrier to make the reference and data-modulated signals orthogonal with...
Joint parallel interference cancellation (PIC) detection and power control scheme for multi-antenna systems is proposed in this paper. At the receiver, the Minimum Mean-Squared Error (MMSE) detector is utilized in the first stage, and its output is used to reconstruct the interference between antennas. Power control methods are proposed to help with the interference reconstruction at the receiver...
The signal path loss characteristics of the human body channel are dependent on the transmission distance and the ground plate size of both the transmitter and the receiver. We investigate the magnitude response of the path loss channel model based on measurement and compute the compatible transmitter power for the communication link when frequency selective digital transmission is used.
In many wireless communication systems, the phase of the received signal can not be tracked accurately due to the random time-varying nature of the channel. Apart from the degradations caused by multipath fading and additive white Gaussian noise (AWGN), the imperfect phase estimation results in additional bit errors at receiver. In this paper, a simple semi-analytical method is presented for evaluating...
In this paper, we consider a relay system for a downlink communication of multi carrier code division multiple access (MC-CDMA) to improve the performance of cell-edge. However since different signals from the base station and the relay station affect different frequency-selective fading channels, the use of frequency-domain equalization at a receiver cannot restore the orthogonality of these signals...
The dynamic input power range resulting in BER<;10-3 using our proposed joint-SPM compensation scheme can be increased by 0.4 dB and 1.2 dB, compared to separately compensate for SPM at either transmitter or receiver side.
In this paper, a secure communication system based on fractional Fourier transform (FrFT) is proposed. Information data is encrypted by a certain order FrFT at transmitter, and then divided into two parts and sent out. The receiver decodes the signal using FrFT with the corresponding order to the transmitter to obtain the original data. Simulation results demonstrate the effectiveness of the proposed...
Bit-interleaved coded modulation with iterative decoding (BICM-ID) performs well under a variety of channel conditions. Based on a factor graph representation of BICM-ID, we propose a modification of the BICM-ID receiver that can reduce the computational complexity significantly without BER degredation. The basic idea is to avoid updates of code bit log-likelihood ratios whose magnitude is already...
This paper presents some new results on MMSE turbo equalization applied to real sea water trials in the Atlantic ocean. High data rate QPSK communications (2 to 7 kbps) have been tested. The receiver includes timing recovery, equalization, interleaving and channel coding. The results which are evaluated in term of BER and MSE show that turbo equalization improves the performance of the receiver.
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