An experimental method for characterizing the time-resolved phase noise of a fast switching tunable laser is discussed. The method experimentally determines a complementary cumulative distribution function of the laser's differential phase as a function of time after a switching event. A time resolved bit error rate of differential quadrature phase shift keying formatted data, calculated using ...

The performance of frequency domain differentially encoded quadrature phase shift keying (FDQPSK) 26 Mb/s orthogonal frequency division multiple access (OFDMA)-systems with respect to phase noise and time-variant frequency-selective fading is analyzed. FDQPSK completely eliminates the common phase error (CPE) when used in combination with a pilot carrier. Despite its higher sensitivity to inter...

ARTICLE HISTORY: Received 28 May 2014 Revised 7 June 2014 Accepted 30 June 2014 In this paper, we propose an optical millimetre wave radio-over-fibre (mm-wave RoF) system that uses a dual drive Mach Zehnder modulator (DD-MZM), which is biased at the maximum transmission biasing point, to generate an optical double sideband-suppressed carrier. The input to the DD-MZM are binary phase shift keyin...

The authors report on a terahertz band wireless communication experiment employing resonant tunneling diode receiver (Rx) and uni-travelling carrier photodiode transmitter. An intermediate-frequency based transmission facilitates low-complexity envelope-detection type Rx architecture for complex-modulated signals. Forward error correction recoverable data-rates using quadrature phase shift keyi...

This paper presents the throughput comparison at the fully functional device and reduced functional devices of IEEE 802.15.4 with different modulation schemes for Wireless Sensor Networks (WSNs). From the simulations it is revealed that Minimum Shift Keying (MSK) is best suited for all types of devices in 802.15.4 for wireless sensor networks if throughput is to be maximized. Simulations also r...

We experimentally demonstrate compensation of nonlinear distortion caused by the Kerr effect in a 3 × 32-Gbaud quadrature phase-shift keying (QPSK) wavelength-division multiplexing (WDM) transmission system. We use optical phase conjugation (OPC) produced by four-wave mixing (FWM) in a 7-mm long silicon nanowire. A clear improvement in Q-factor is shown after 800-km transmission with high span ...

A continuous phase modulation (CPM) implementation alternative of a recently standardized class of Feher-patented quadrature phase-shift keying (FQPSK-B) modulation is proposed. It is based on the fact that FQPSK-B signal has quasi-constant amplitude and continuous phase characteristics, allowing CPM interpretation. Based on this, we derive the modulation index, premodulation filter and alterna...

In this paper, two-user Gaussian interference channel (GIC) is revisited with the objective of developing implementable (explicit) channel codes. Specifically, low density parity check (LDPC) codes are adopted for use over these channels, and their benefits are studied. Different scenarios on the level of interference are considered. In particular, for strong interference channel examples with ...

In modern communication systems, modulation is a key function that embeds the baseband signal (information) into a carrier wave so that it can be successfully broadcasted through a medium such as air or cables. Here we report a flexible all-graphene modulator circuit with the capability of encoding a carrier signal with quaternary digital information. By exploiting the ambipolarity and the nonl...