An eight-dimensional signaling scheme for bandlimited channels

Abstract

The demand for higher bandwidth and power efficiencies in digital communication makes multidimensional modulation schemes increasingly attractive. In this paper we introduce one such scheme, called 8D-4P2C (for 8 Dimensions, 4 Pulses, and 2 Carriers). This scheme has a compact spectrum and is easily implementable. Moreover, it is amenable to a simplified detection scheme with a marginal loss of efficiency with respect to optimum demodulation. Its performance, obtained by computer simulation, proves its attractiveness for digital radio systems.Ezio Biglierit data vector is recovered by exploiting the orthogonality of the basis functions: a bank of N filters, each matched t o one $j(t), gives x at its output. When seen from this point of view, Q2PSK can be seen as simple way of generating an orthogonal basis endowed with a special "two-st age" structure, which makes detect ion simpler.In this paper we describe a new technique to generate easily implement able multidimensional basis signals for transmission over bandlimited channels. When applied to the generation of 8-D modulations, it provides signals that outperform comparable 2-D and 4-D schemes. Although the analysis is restricted here to N = 8, our approach is general enough to be easily extended to any larger N .

Advances in multidimensional coded modulation techniques for nonlinear channels

“…Recently, we introduced a modulation scheme, called 8D-4P2C (for 8 Dimensional, 4 Pulses and 2 Carriers) [2]. Such a modulation scheme has a nonconstant envelope, which *The author undertook this work with the support of the "ICTP Programme for Training and Research in Italian Laboratories," 'Ikieste, Italy.…”

“…This selection of q5(t) gives us a large number of possible waveforms suitable for designing different 8D-CEMS.In particular, we may choose(4)where is T = 4Tb. This coded modulation scheme we called 8D-4P2C[2]. Another choice for $(t) is 1 q(t) = 4 3 (sin u sin w + -sin 3u sin 3w…”