PSK is a common modulation format in digital communications. The estimation of modulation parameters is necessary for emitter interception in support of numerous military applications. This paper develops the Cramer-Rao Lower Bound for the modulation parameters of a PSK signal. The modulation parameters considered are the carrier frequency, the symbol time and the signal amplitude. The results ...

The capacity of time-hopping pulse position modulation (PPM) and pulse amplitude modulation (PAM) for an ultra-wideband (UWB) communication system is investigated based on the multipath fading statistics of UWB indoor wireless channels. A frequency-selective fading channel is considered for both single-user and multiple-user UWB wireless systems. A Gaussian approximation based on the single-use...

A new mathematical treatment and algorithm for the design of |B1(+)|-selective RF excitation pulses is presented and validated. The algorithm is based on a rotated Shinnar-Le Roux pulse design algorithm, wherein the pulse's frequency modulation waveform is directly designed by the algorithm, and its amplitude and sign modulation waveform takes the place of the gradient field. A new pulse config...

This paper proposes a new scheme Pulse Width Modulation (PWM) to overcome low performances of conventional PWM control strategy in Cascaded Multilevel Inverter (ACMLI). This scheme advance conventional Carrier-Based PWM (CBPWM) using triangle carrier in different amplitudes. By this scheme ACMLI can control by PWM that according to dc voltage amplitude used and finally the Total Harmonics Disto...

In this paper, we present the construction of full rate, fully diverse and totally real space-time (ST) codes for ultra-wideband (UWB) transmissions. In particular, we construct two families of codes adapted to real carrier-less UWB communications that employ Pulse Position Modulation (PPM), Pulse Amplitude Modulation (PAM) or a combination of the two. The first family is constructed from total...

In the NLC, the energy variation along the multi-bunch beam pulse will be controlled by preloading the structure with a ramped rf profile which is followed by constant amplitude rf. The rf amplitude modulation will be achieved by combining the outputs of pairs of oppositely phase-modulated klystrons through a hybrid. Such agile phase modulation is currently used in the NLCTA[ I]. The duration o...

Minimum shift keying and offset QPSK are two well-known modulations which can be interpreted as a set of time/phase-shifted AM pulses. We show in this paper that any constant amplitude binary phase modulation can also be expressed as a sum of a finite number of time limited amplitude modulated pulses (AMP decomposition). New methods for computing autocorrelation and power frequency spectrum are...

© 2010 Chengshi Zhao et al. 11 A novel ultra-wideband (UWB) transceiver structure is presented to be used in wireless body area networks (WBANs). In the proposed structure, a data channel and a control channel are combined into a single transmission signal. In the signal, a modulation method mixing pulse position modulation and pulse amplitude modulation is proposed. A mathematical framework ca...

We introduce a flexible, software-defined real-time multi-modulation format receiver implemented on an off-the-shelf general-purpose graphics processing unit (GPU). The flexible is able to process 2 GBaud 2-, 4-, 8-, and 16-ary pulse-amplitude modulation (PAM) signals as well 1 16- 64-ary quadrature amplitude (QAM) signals, with the latter detected using Kramers-Kronig (KK) coherent receiver. E...

We introduce a subspace-based algorithm for the blind identification of time-dispersive channels in pulse shaping OFDM systems based on offset quadrature amplitude modulation (OFDM/OQAM). Our approach exploits cyclostationarity induced by the use of overlapping pulse shaping filters and uses second-order statistics only. The proposed method is similar in spirit to modulation-induced cyclostatio...