EP0752779A2
Expired / Lapsed
EP
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Distribution of phase of references in a multicarrier system
Assignee: Nokia Oyj
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Filing: 1996-06-28
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Granted: —
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Expires: 2016-06-28
Abstract
Abstract The invention relates to the organization of phase references in a data transfer system based upon the multiplexing of orthogonal frequency components, when transmissions in the said system are composed of relatively short symbol sequences. In accordance with the invention, in the first symbol (OS1) of the sequence differential phase-shift keying between elementary signals is carried out, based upon a phase reference (Ref) transmitted in one or several subfrequency bands (fc) and upon a phase shift chain propagated one subfrequency thereof at a time. In each subfrequency band in the subsequent symbols of the sequence phase-shift modulation refers to the elementary signal of the preceding symbol of the same subfrequency band. The invention may be applied with benefit to digital cellular network systems which employ the OFDM method.
Inventors
- 👤 Esa Malkamäki
- 👤 Jari Junell
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 09:44
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/18; H04L27/20; H04L27/2032; H04L27/2053; H04L27/206; H04L27/2067; H04L27/2075; H04L5/00; H04L5/0001; H04L5/0003; H04L5/0005; H04L5/0007; H04L5/003; H04L5/0048
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
230 words
A method for the application of data for transfer to a radio-frequency signal, the generation of which is based upon the multiplexing of orthogonal frequency components, comprising a plurality of carriers of differing frequencies, which form subfrequency bands (f) and comprise in time direction distinct elementary signals (R), of which the simultaneous elementary signals of different subfrequency bands form a symbol (OS; OS1), those symbols in temporal succession forming a symbol sequence, characterized in that the said data for transfer are applied to the said radio-frequency signal by a phase modulation method, wherein - the first symbol (OS1) ) of the said symbol sequence comprises the first elementary signal (Ref), which contains the phase reference, - the said first symbol (OS1) comprises a group of other elementary signals, the information content of which is defined as the phase shift in frequency direction to the adjacent elementary signal, forming a differential phase shift chain, the head of which is the said first elementary signal (Ref), and - the information content of each elementary signal in other symbols of the said symbol sequence is defined as a phase shift to the preceding elementary signal in time direction of the same subfrequency band, forming a differential phase shift chain, the head of which is the elementary signal of the first symbol (OS1) of the said symbol sequence in the subfrequency band in question.
Claim 2
Dependent Claim
82 words
A method in accordance with Claim 1, characterized in that the said radio-frequency signal is transmitted from the transmitter device to the receiver device via a data transfer system which employs time-division multiple access and that from it is formed for transfer by the method according to Claim 1 symbol sequences, each of which is transmitted from the said transmitter device to the said receiver device in one particular time slot, the time interval of which determines the said time-division multiple access.
Claim 3
Dependent Claim
85 words
A method in accordance with Claim 1, characterized in that the group of said elementary signals comprised by the first symbol (OS1) is divided into two parts, elementary signals (Ref) belonging to the first part of which are used for transmission of the phase references and elementary signals belonging to the second part of which are used for transmission of actual data for transfer and the ratio of the number of elementary signals in the said first and second parts of which is essentially 1/100.
Claim 4
Dependent Claim
112 words
A transmitter device for application of the data for transfer to a radio- requency signal and for its transmission to the receiver, which transmitter comprises apparatus (D1, D2) for the formation of subfrequency bands (f) which are formed from a plurality of orthogonal frequency components and for application of the data to the said subfrequency bands as elementary signals of a certain length, characterized in that it comprises apparatus (1f, X) for the formation of differential phase-shift keying between temporally simultaneous elementary signals belonging to different subfrequency bands (f) and apparatus (1T, X) for the formation of differential phase-shift keying between temporally successive elementary signals belonging to the same subfrequency bands (f).
Claim 5
Dependent Claim
108 words
A receiver device for the reception of a radio-frequency signal and for decoding of transferred data therefrom, which receiver comprises apparatus for division of the said radio-frequency signal into subfrequencies and for decoding of the data from the said subfrequencies as elementary signals of a certain length in time, of which the temporally simultaneous elementary signals at different subfrequencies form a symbol, characterized in that it comprises apparatus for the decoding of data from differential phase-modulation chains formed by the said elementary signals, which chains consist of elementary signals of the same symbol in different subfrequency bands or elementary signals of the same subfrequency band in different symbols.
References Cited (Backward Citations)
No citation records indexed.
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