The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Carrierless amplitude and phase modulation (CAP) has been widely employed in visible light communication (VLC) as a result of its implementation simplicity. While the simplicity of CAP receiver results in the elimination of carrier recovery, it also leads to significant increase in CAP sensitivity to timing jitter. In this paper, a novel correlation-based synchronization algorithm whose synchronization...
We propose and demonstrate via both simulation and experiment a scheme for a low-bit resolution digital-to-analog convertor (DAC) to improve the signal-to-quantification noise ratio (SQNR) of an intensity-modulated direct-detection (IM-DD) orthogonal frequency division multiplexing (OFDM) signal. In this scheme, the discrete output levels of a DAC are nonuniform and properly assigned based on the...
An area-efficient digitally-assisted DC canceling loop is presented for high sensitivity single-chip UHF RFID readers. The proposed loop suppresses the DC blocker in RFID receivers by 41 dB with the aid of negative feedback. A delta-sigma modulator with 67dB dynamic range is implemented in the loop to enhance the sensitivity of the receiver. A reconfigurable digital loop filter with low cut off frequency...
We report on the use of 4-Dimension coded modulation for short-reach interfaces. With low extra complexity, 4D-coded PAM4 enables a performance improvement when associated with low-latency and low-complexity FEC, as demonstrated by experimental results.
We propose a new 4D coded modulation format, 64SP-12QAM, with same SE as PM-8QAM and straightforwardly-switchable with PM-16QAM. We experimentally demonstrated over 0.2 dB better sensitivity for 64SP-12QAM compared to PM-8QAM, enabling a transmission reach extension to 6,000 km at 6b/s/Hz.
A 1.25 Gb/s ASK PON system with −51dBm sensitivity (at BER=2−103) is enabled by a polarization-independent coherent receiver that needs no DSP (nor ADC). The system just uses common DFBs and commercial electronic devices and has 52 dB dynamic range.
A broadband preamplifier with gain control and automated common-mode level regulation is presented. It is implemented in 65-nm CMOS as part of an analog front-end (AFE) that is especially suitable for wireline receivers incorporating digital signal processing or multilevel modulation. S-parameter measurements of the receiver show that the preamplifier remains well matched to the channel impedance...
We extend a non-data-aided constant modulus algorithm (CMA) by a differential phase compensation (DPC-CMA) and simulate its polarization demultiplexing performance in a digital coherent QPSK receiver against that of the standard CMA.
An ultra-low power 2.4 GHz RF Wakeup Receiver is designed for wireless sensor networks nodes. The receiver demodulates On-Off Keying at 100 kbps. A 120 nm CMOS chip includes the analog front-end and consumes only 7.5 mu W from a single 1.5 V supply. The digital signal processing is implemented in an FPGA. The results of measures and simulations are evaluated for the use of this receiver in wireless...
Coherent optical communications were studied extensively in the 1980s; however, their R&D activities have been interrupted for almost 20 years behind the rapid progress in high-capacity WDM systems using EDFAs. In 2005, the demonstration of the digital coherent receiver stimulated a widespread interest in coherent optical communications again. This is because such receiver enables us to employ...
This paper discusses the performance of the wavelet based filtered multi-tone (WFMT) modulation. The novel WFMT modulation was proposed in 2003 for improving characteristics of wireless and DSL multicarrier systems. In this paper we describe a main idea of WFMT and discuss the advantages of this novel modulation. The WFMT modulation in comparison with OFDM and DMT has low level of out-of-band side...
Coherent systems can achieve better spectral efficiency, and better sensitivity than conventional on-off keying systems. This paper reviews recent research efforts and examines future possibilities in the field.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.