Evolution of CDMA from interference-limited to noise-limited
Wireless communications systems and networks
Time of arrival estimation for UWB localizers in realistic environments
EURASIP Journal on Applied Signal Processing
EURASIP Journal on Advances in Signal Processing
Performance of Coherent Receivers for PCTH-Based UWB System with Diversiform Modulation Schemes
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
A new parameter for UWB indoor channel profile dentification
IEEE Transactions on Wireless Communications
Blind linear equalization of PPM signals using third-order moments
IEEE Transactions on Wireless Communications
Communication in a Poisson field of interferers-part II: channel capacity and interference spectrum
IEEE Transactions on Wireless Communications
Fundamental limits of wideband localization: part I: a general framework
IEEE Transactions on Information Theory
Non-coherent UWB communication in the presence of multiple narrowband interferers
IEEE Transactions on Wireless Communications
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This paper characterizes the power spectral density (PSD) of various time-hopping spread-spectrum (TH-SS) signaling schemes in the presence of random timing jitter, which is characterized typically by a discrete-time stationary random process (independent of the TH sequences and data sequence) with known statistical properties. A flexible model for a general TH-SS signal is proposed and a unified spectral analysis of this generalized TH-SS signal is carried out using a systematic and tractable technique. The key idea is to express the basic baseband pulse in terms of its Fourier transform which allows flexibility in specifying different TH formats throughout the general derivation. The power spectrum of various TH-SS signaling schemes can then be obtained as a special case of the generalized PSD results. Although general PSD results are first obtained for arbitrary timing jitter statistics, specific results are then given for the cases of practical interest, namely, uniform and Gaussian distributed jitter. Applications of this unified spectral analysis includes: (1) clocked TH by a random sequence; (2) framed TH by a random sequence; and (3) framed TH by a pseudorandom periodic sequence. Detailed descriptions of these different TH techniques are given where the first two techniques employ a random sequence (stochastic model) and the third technique employs a pseudorandom sequence (deterministic model).