Transmitting extra bits by rotating signal constellations

Applying spread spectrum technique for transmitting extra bits over AWGN channel

Floating Signal Constellations for Multimedia

Floating Signal Constellations for Multimedia Steganography Mahalingam Ramkumar, Ali N. Akansu and Xiaodong Cai Department of Ele tri al and Computer Engineering New Jersey Center for Multimedia Resear h New Jersey Institute of Te hnology University Heights, Newark, NJ 07102. ali megahertz.njit.edu Abstra t| Conventional spread spe trum ommuni ation methods essentially map a dis rete symbol fro...

Transmitting a signal by amplitude modulation in a chaotic network

We discuss the ability of a model of network with nonlinear units and chaotic dynamics to transmit signals, on the basis of a linear response theory developed by Ruelle [D. Ruelle, J. Stat. Phys. 95, 393 (1999)] for dissipative systems. We discuss in particular how the dynamics may interfere with the graph topology to produce an effective transmission network, whose topology depends on the sign...

Signal Constellations for Noncoherent Space-Time Communications

We examine the problem of designing signal constellations for the multiple transmitmultiple receive antenna Rayleigh fading communication channel. By employing the asymptotic union bound on the probability of error, we find a new formulation of the problem of signal design for the noncoherent fading channel. Since unitary signals are optimal (in the limit of large signal to noise ratios), the d...

Irregular Signal Constellations , Mappings and Precoder

This paper investigates adaptive bit-interleaved coded modulation (BICM) with different iterative decoding schemes for bandwidth efficient transmission. We assume knowledge of the average channel quality at the transmitter. For a fixed modulation scheme, the bandwidth efficiency can be adapted to the channel quality by changing the channel code rate and the iterative decoding procedure can be o...