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AssigneeNokia Corporation
InventorsKeijo Ruotsalainen, Markku Heikkila
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A digital communication system (20) in which a signal constellation (30) of a dimensionality of at least four is used, with distance properties chosen to reduce the bit error rate compared to that of digital communication systems using signal constellations of half the dimensionality. A symbol generator (21) uses the higher dimensional signal constellation (30), or any orthogonal transformation of the higher dimensional signal constellation (30), to translate a bit stream into a stream of higher dimensional symbols, which it then provides to a modulator (22). The modulator (22) transmits each higher dimensional symbol in at least two parts, using a modulation scheme according to the prior art, such as QAM or QPSK.
A digital communication system (20) having a symbol generator (21) and a modulator (22), the symbol generator (21) for translating a bit stream into a symbol stream based on a predetermined signal constellation (30), each symbol in the symbol stream representing a predetermined even number of consecutive bits in the bit stream, the modulator (22) using a predetermined modulation scheme to modulate a carrier signal with the symbol stream so as to provide a modulated carrier signal, characterized in that the signal constellation (30) has a dimensionality that is at least four and is an integral multiple of two, and that each symbol of the signal constellation (30) corresponds to an ordered set of at least two sets of two or more numbers, and further characterized in that for each of the at least four-dimensional symbols, the modulator (22) modulates the carrier signal using in turn each of the at least two corresponding sets of two or more numbers.
A method by which a digital communication system (20) transmits a bit stream, the digital communication system (20) having a symbol generator (21) and a modulator (22), the symbol generator (21) for translating the bit stream into a symbol stream based on a predetermined signal constellation (30), each symbol in the symbol stream representing a predetermined even number of consecutive bits in the bit stream, the modulator (22) using a predetermined modulation scheme to modulate a carrier signal with the symbol stream so as to provide a modulated carrier signal, characterized in that the signal constellation (30) has a dimensionality that is at least four and is an integral multiple of two, and that each symbol of the signal constellation (30) corresponds to an ordered set of at least two sets of two or more numbers, and further characterized in that for each of the at least four-dimensional symbols, the modulator (22) modulates the carrier signal using in turn each of the at least two corresponding sets of two or more numbers.
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