The jointly optimum noncoherent multiuser detector is obtained for nonlinear nonorthogonal modulation over the frequency nonselective Rayleigh-fading multiple-access channel. Upper and lower bounds on average bit-error probability are derived. While these bounds are numerically computable, they are too complicated to give insight into the relative influence of system parameters on the essential...

This diploma thesis evaluates the performance of differential modulation applied to the 3GPP Long Term Evolution downlink. The focus specifically lies on single input single output transmissions with only one user. The Long Term Evolution downlink is based on channel estimation. The reference symbols, required for channel estimation cannot be used to transmit data, which reduces the spectral ef...

For lack of empty radio bands, ultrawideband (UWB) radio system allowing reuse of already occupied frequency bands is the only solution to accommodate new wireless data communication services. Two types of UWB carriers are considered here, the frequency-shifted Gaussian pulse and chaotic signal with FM-DCSK modulation. A generalized model of transmitted reference systems is introduced first tha...

This paper focuses on maximum-likelihood sequence estimation of noncoherent -ary differential phase-shift keying ( -DPSK) receivers for code division multiple-access (CDMA) systems, which make use of direct-sequence spread-spectrum modulations. A typical frequency-selective Rayleigh environment with multipath diversity at the receiver is considered. In this scenario, the optimum noncoherent dec...

We consider signal design for the noncoherent block-Rayleigh-fading channel, in which neither the transmitter nor the receiver know the fading coefficients. We show that several recently proposed signal designs for this channel can be interpreted as training-based, i.e., part of the coherence interval is used to transmit known symbols to learn the channel and in the remainder a “coherent” infor...

For turbo reception of coded transmissions over unknown doubly selective channels, such as time-varying ISI channels or frequency-varying ICI channels, we propose several soft noncoherent equalizers based on basis expansion (BE) channel modeling and tree search, as a departure from traditional designs based on Gauss-Markov channel modeling and trellis processing. We begin by deriving the optima...

Binary PCM/FM has been widely adopted as a standard by the telemetry community. It offers a reasonable balance between detection efficiency and spectral efficiency, with very simple implementation in both the transmitter and receiver. Current technology, however, allows practical implementations of more sophisticated demodulators, which can substantially improve the detection efficiency of the ...

A noncoherent sequential P N code acquisition technique is proposed in this paper. Noncoherent detection is employed to handle the seriously noisy environments, while the carrier frequency offset and data modulation effects can be simultaneously taken care of. To realize the sequential acquisition, the out-of-phase and in-phase sequences are properly modeled to avoid the significantly high erro...

INTRODUCTION To study the effects of Polarized Polychromatic Noncoherent Light (Bioptron) therapy on patients with carpal tunnel syndrome (CTS). METHODS This study was designed as a randomized clinical trial. Forty four patients with mild or moderate CTS (confirmed by clinical and electrodiagnostic studies) were assigned randomly into two groups (intervention and control goups). At the beginn...