Rohde and Schwarz Gmbh & Co. Kg

Rainer Bott

Dimitri Korobkov

Guenter Greiner

Karlheinz Pensel

Günter Wicker

A method for frequency and time synchronization of a receiver for receiving Orthogonal Frequency Division Multiplexing (OFDM) signals is described. A quality criterion of a OFDM signal is determined during one of the frequency intervals (hops) for each point of one of the two-dimensional frequency and time search areas. The area point having the optimum quality criterion (&#x3c4;, f) of the OFDM signal is then determined on the basis of said quality criterion, and the receiver is synchronized on the nominal frequency in view of the different between the nominal frequency (f) and the frequency value (f) corresponding to the optimum quality criterion. The OFDM signal may be demodulated and decoded starting with the time value (&#x3c4;) corresponding to the optimum quality criterion.

Synchronization of an orthogonal frequency division multiplexing (OFDM) receiver

The invention relates to a system for transmitting data according to the frequency hopping method. The digital data, which is transmitted in suddenly changing transmission frequency hops, is encoded according to a woven code consisting of an interlinked external and internal convolution code. The data to be transmitted by hop is preferably distributed over several parallel hops sent with different frequencies.

System for treatment data by the frequency hopping method

A method and apparatus for processing Orthogonal Frequency Division Multiplex (OFDM) signals is described, in which OFDM signals are conditioned in an OFDM modulated on the transmitter side for each symbol of a data stream to be transmitted and sent as a multicarrier signal. For each OFDM signal, the maximum amplitude of a block is determined for least one block and then normalized to a system-specific, transmitter-specific maximum value.

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Andechs, Germany

Rainer Bott