EP0613266A2
Expired / Lapsed
EP
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OFDM receiver with compensation for differential delays
Assignee: Koninklijke Philips NV
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Filing: 1994-02-02
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Granted: —
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Expires: 2014-02-02
Abstract
Abstract Receiver for receiving a transmission signal comprising N frequency multiplexed data modulated carriers, having a good comprise between insensitivity to multipath reception and receiver complexity, and which may enable a reduction in transmission bandwidth and transmitter power. In such a receiver modulation signals of the carriers are supplied by a frequency multiplex demodulator to a symbol detection device via an equalizer device. The equalizer device compensates distortion in the modulation signals supplied thereto, such that the symbol detection device may detect the transmitted data with reduced error probability. When the transmission signal reaches the receiver with different delay times, this distortion is mainly a kind of cross-talk between the modulation of adjacent carriers. Therefore substantial compensation is achieved by combining the modulation signal of a carrier with signals representative of the data of the adjacent carriers. In the receiver these signals may be obtained from the multiplex signal path between the frequency multiplex demodulator output and the output of the symbol detection device.
Inventors
- 👤 Constant Paul Marie Jozef Baggen
- 👤 Arie Geert Cornelis Koppelaar
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 13:37
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/26; H04L27/2601; H04L27/2647; H04L27/2649; H04L27/2653
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
166 words
Receiver for receiving a transmission signal comprising a plurality of (N) frequency multiplexed data modulated carriers, said receiver comprising a frequency multiplex demodulator and a data recovery device having an input for receiving modulation signals of said carriers from the frequency multiplex demodulator, and an output for supplying recovered data to further signal processing devices, and having a multiplex data recovery signal path between said input and said output for carrying a multiplex signal having N signal components, each component representing the data of an individual carrier, and having an equalization device and a symbol detection device subsequently arranged in the multiplex signal path, characterized in that the equalization device comprises combining means for combining a modulation signal of a carrier with a group of (M) signal components representing the data of M carriers frequency adjacent to said carrier, M being substantially smaller than N, for supplying the combined signal components to the symbol detection device, such as to recover the data modulated on said carrier.
Claim 2
Dependent Claim
166 words
Receiver for receiving a transmission signal comprising a plurality of (N) frequency multiplexed data modulated carriers, said receiver comprising a frequency multiplex demodulator and a data recovery device having an input for receiving modulation signals of said carriers from the frequency multiplex demodulator, and an output for supplying recovered data to further signal processing devices, and having a multiplex data recovery signal path between said input and said output for carrying a multiplex signal having N signal components, each component representing the data of an individual carrier, and having an equalization device and a symbol detection device subsequently arranged in the multiplex signal path, characterized in that the equalization device comprises combining means for combining a modulation signal of a carrier with a group of (M) signal components representing the data of M carriers frequency adjacent to said carrier, M being substantially smaller than N, for supplying the combined signal components to the symbol detection device, such as to recover the data modulated on said carrier.
Claim 3
Dependent Claim
33 words
Receiver as claimed in Claim 1, characterized in that said combining means comprises a feedforward input for receiving modulation signals of a group of frequency sequential carriers supplied by the frequency multiplex demodulator.
Claim 4
Dependent Claim
35 words
Receiver as claimed in Claim 1, characterized in that said combining means comprises a decision feedback input for receiving delayed detected data of a group of frequency sequential carriers supplied by the symbol detection device.
Claim 5
Dependent Claim
61 words
Receiver as claimed in Claim 1, characterized in that said combining means comprises a feedforward input for receiving modulation signals of a group of frequency sequential carriers supplied by the frequency multiplex demodulator, and in that said combining means comprises a decision feedback input for receiving detected data of a group of frequency sequential carriers supplied by the symbol detection device.
Claim 6
Dependent Claim
38 words
Receiver as claimed in Claim 2 or 4, characterized in that the equalization device comprises feedforward scaling means arranged between the frequency multiplex demodulator and said combining means for scaling the modulations signals supplied to the feedforward input.
Claim 7
Dependent Claim
40 words
Receiver as claimed in Claim 3 or 4, characterized in that the equalization device comprises decision feedback scaling means arranged between the symbol detection device and said combining means for scaling the detected data supplied to the decision feedback input.
Claim 8
Dependent Claim
90 words
Receiver as claimed in Claim 5 or 6, characterized in that the equalization device comprises scaling adjustment means for adaptively adjusting said scaling, said scaling adjustment means having a first input for receiving an input signal of said scaling means, a second input for receiving the output signal of said combining means supplied to the symbol detection device, and a third input for receiving the detected data in response to said output signal, and means for performing an adjustment of said scaling according to the Least Mean Square Error algorithm.
Claim 9
Dependent Claim
67 words
Receiver as claimed in one of the previous Claims, characterized in that the frequency multiplex demodulator comprises time multiplexing means for providing time multiplexed modulations signal to said data recovery device of which the multiplex signal path is arranged to carry time multiplex signal components, and that the equalisation device comprises time demultiplexing means preceding said combining means for time demultiplexing said group of M signal components.
Claim 10
Dependent Claim
30 words
Data recovery device as claimed in one of the previous Claims, characterized in that it includes a semiconductor body in which said equalization device is formed as an integrated circuit.
References Cited (Backward Citations)
No citation records indexed.
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