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 .
A new class of modulation schemes, called 8D-CEMS (8 Dimensional Constant Envelope Modulation Scheme), with constant envelope of the modulated sig; nal, for digital radio communications over non-linearly amplified channels is introduced.Computer simulation results show that these modulation schemes lead to significant performance improvement on non-linearly amplified channel, as required in most commercial satellite and terrestrial microwave systems. In particular, we show how to generate an 8D-CEMS that allows one to achieve a bit-error rate of Pb, = at EbINO = 9 dB with spectral efficiency 3 bits/s/Hz.
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