In this paper, a power-efficient low-complexity iterative receiver structure for noncoherent transmission over Rayleigh flat fading channels without channel state information (CSI) is presented. As the main contribution, several novel decision-feedback assisted differential demodulators are derived, which are well suited to implementation. Thereby, the general case of multiple transmit and mult...

A self-adaptive maximum likelihood bit synchronization approach dedicated for GPS receivers is proposed. The approach introduces a normalized gap between the maximal and the submaximal bit energies to the conventional maximum likelihood method with fixed noncoherent accumulation times as an indicator, to constrain the noncoherent accumulation times for various signal powers self-adaptively. Sim...

| In this paper, a novel noncoherent linear equalization scheme is introduced and analyzed. The proposed scheme is not only applicable for M{ ary di erential phase{shift keying (MDPSK) but also for M{ary di erential amplitude/phase{shift keying (MDAPSK) and minimizes the variance of intersymbol interference (ISI) in the equalizer output signal. The optimum equalizer coeÆcients may be calculated...

In this paper, we consider noncoherent random linear coding networks (RLCNs) as a discrete memoryless channel (DMC) whose input and output alphabets consist of subspaces. This contrasts with previous channel models in the literature which assume matrices as the channel input and output. No particular assumptions are made on the network topology or the transfer matrix, except that the latter may...

The influence of code synchronization errors on the performance of direct-sequence spread-spectrum (DS/SS) communication systems is investigated. Insight is gained in the degradation of some basic performance parameters due to the tracking bias of a noncoherent delay lock loop (DLL). The performance parameters investigated are the bit-error probability, throughput and delay. Numerical results s...

Eric K. Hall and Stephen G. Wilson University of Virginia Charlottesville, VA 22903 Abstract In this work, the application of turbo codes to communications systems using noncoherent FSK and DPSK is considered for the AWGN channel. For both cases, the turbo decoder is formulated employing the appropriate channel metrics. For DPSK, a Gaussian metric is formed while FSK utilizes two decision stati...

A noncoherent, bandwidth-efficient modulation scheme is proposed for frequency-hopping multiple-access (FH-MA) networks. The proposed scheme is a combination of noncoherent -ary amplitude-shift keying (NMASK) and orthogonal frequency-division multiplexing (OFDM). Using this scheme will minimize the required data bandwidth. The number of frequency slots available to the users will increase signi...

We study the influence of external noise on the relaxation to an invariant probability measure for two types of nonhyperbolic chaotic attractors, a spiral (or coherent) and a noncoherent one. We find that for the coherent attractor the rate of mixing changes under the influence of noise, although the largest Lyapunov exponent remains almost unchanged. A mechanism of the noise influence on mixin...

Low power laser therapy (photobiomodulation, laser biostimulation) was advanced more than 30 years ago. Since then medical treatment with coherent light sources (lasers) or noncoherent light (Light Emitting Diodes, LED’s) has passed through its childhood and early maturity. The controversial points of laser biostimulation, which were topical at the end of 80ties (reviews [1-3]), are not topical...