In this paper we propose a simple algorithm for the blind separation of m synchronous co-channel BPSK signals by an array of n receiving antennas. We exploit the geometric implications of the finite alphabet property of BPSK signals. After a standard channel whitening step, the noiseless received data vectors describe an m-cube, which is a rotated version of the hypercube defined by the 2, dist...

The Johns Hopkins University/Applied Physics Laboratory Laurel, Maryland ABSTRACT Monte Carlo simulations model the eflects of partial-band jamming on turbo code performance over a slow frequency-hopped spread spectrum signal. Decoders using both hard and soft decision variables corrupted by Additive White Gaussian Noise (A WGN) are considered. Modulations include both Binary Phase Shzjl Keying...

In this paper, we examine the performance of several modulation formats in more than four dimensions for coherent optical communications systems. We compare two high-dimensional modulation design methodologies based on spherical cutting of lattices and block coding of a 'base constellation' of binary phase shift keying (BPSK) on each dimension. The performances of modulation formats generated w...

In this paper, we propose the space-time turbo codes designed over integer ring for BPSK and QPSK modulation. The proposed spacetime turbo codes addeve the full spatial diversity and can be decoded using the iterative binary soft-input sofl-output (SISO) algorithm. The BPSK/QPSK binary rank criterion is used to find the interleavers which guarantee the full spatial diversity. It is shown that t...

This paper describes a methodology for top-down design, modeling, and simulation of complete RF system using hardware description language VHDL-AMS. As a demonstration example, we consider a simple BPSK system (transmitter, channel, and receiver) and show the details of VHDL-AMS implementation for each elementary block (mixer, oscillator, amplifier, channel, etc.). Using these behavioral blocks...

We propose a scheme to achieve regenerative format conversion from a distorted non-return-to-zero-on-off-keying (NRZ-OOK) signal to a return-to-zero-binary-phase-shift-keying (RZ-BPSK) signal of high quality in an integrated device. This proposal is achieved by employing an interferometer on a silicon chip with a coupled ring resonator optical waveguide embedded in one arm. In this scheme the a...

This paper investigates the subject of reducing the complexity of turbo equalization in which a receiver combines the equalization and decoding process in an iterative fashion. We show that it is possible to approximate the a posteriori probability (APP) module by two time varying linear transversal filters and a simple non-linear memoryless processor, and thus replace the exponential complexit...

We study the efficacy of a generalised form of differential encoding of binary phase shift keyed (BPSK) signals transmitted through a shallow underwater acoustic communication channel. Using simulations involving a fixed source and a receiver moving about with the surface waves, we show that no advantage arises from using the generalised differential encoding methods. On the contrary, the best ...