COURS MODULATION GMSK PDF

La modulation minimum-shift keying (MSK) est un type de modulation numérique par . En télécommunications numériques, la Gaussian minimum shift keying ( GMSK) est une forme de modulation FSK à phase continue. Elle est similaire au . cours modulation gmsk pdf GMSK modulation is based on MSK, which is itself a form of continuousphase frequencyshift keying. One of the problems with. 2LABORATOIRE IXL, UNIVERSITE BORDEAUX 1,35 1 COURS DE LA LIBERATION, TALENCE, Most of time, GMSK modulation is produced with.

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Therefore, this new expression will be more appropriate when several modulation schemes are possible which is the case for the EGPRS system for example.

In addition, in the case where the quality evaluation is performed in the network, the quality assessment may be performed in one or the other constituent of such a network entities referred to herein as radio network entities mobilesuch as: In systems having a plurality of possible modulation schemes, another possibility is to consider a given modulation scheme corresponding to a given modulation called reference to the raw bit rate, that is to say replacing N i c N c which is the number of bits in a block using the reference modulation e.

The connection is then a downlink or “downlink” in English.

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There are also other cases where BLER is not a satisfactory criterion, especially when using the technique called incremental redundancy or “incremental redundancy” in English.

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A need therefore exists for a quality indicator that would include avoiding the various aforementioned drawbacks, especially that would be relevant for most systems, while being accurate and relatively simple to calculate. TR Free format text: Variable rate forward error correction for enabling high performance communication.

Network entity mobile radio, for carrying out a method according to one of claims 1 to 10, characterized in that it comprises means for evaluating the quality of a radio link, from the net flow transmitted over said link.

According to another feature, said link is a downlink. Mobile station, for carrying out a method according moculation one of claims 1 to 10, characterized in that it comprises means for evaluating the quality of a radio link from the net flow transmitted over said link. This error detection code to detect if an RLC data block is received correctly or not. More the spectral efficiency of modulation is high, and the higher the transmitted bit rate can be high.

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However, a high coding rate requires good radio conditions, otherwise the quality of service is degraded. The transmitter 1 comprises, in the example illustrated: Another object of the present invention is a network entity of mobile radio, this entity being essentially characterized in that it comprises means for assessing the quality of a radio link, from the net flow transmitted over said link. Quality assessment method for a radio link in a mobile radio communications system.

These quality indicators are indeed representative of the quality of the transmission channel, or the relationship between quality of service and the quality of the transmission channel is not fixed but depends on many factors such as environment, speed the mobile station, Methods for forward error correction coding above a radio link control layer and related apparatus.

AT Ref legal event code: According to another feature, the transmitted blocks or radio blocks, which may include one or more blocks or data blocks, depending on the modulation scheme used, the ratio between the net rate and the raw bit rate is obtained by calculating: Another object of the present invention is a mobile radio system, which system is essentially characterized in that it comprises means for evaluating the quality of a radio link from the net flow transmitted over said link.

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A method for evaluating the quality of a radio link in a mobile radio system, said method being characterized in that said quality is estimated from the net flow transmitted over said link. If the g,sk assessment is carried out in the network: Algorithms such as for example, link adaptation algorithms or cell reselection is generally implemented in the network, the network can thus himself determine the BLER, for the downlink direction, without it being necessary that the mobile station defers to the network the value of BLER it determines.

In systems such as eg GPRS and EGPRS systems, the correct or incorrect status of blocks received necessary for the gnsk quality assessment one or other of the above expressions can be obtained as follows.

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The coding rate is defined as the ratio of the number of information bits to be transmitted on the number of bits transmitted or coded modulatoon. The raw bit rate R is defined as the gross bit rate transmitted over the radio interface.

According to another characteristic, the data transmitted over said connection being obtained by encoding bit block of information, the net rate is obtained by calculating: This technique therefore also as the technical link adaptation to increase the throughput, but as the BLER can then be much higher than in the case where this technique is not used, this criterion is not not the most relevant.

A method according to claim 3, characterized in that the ratio between the net rate and the raw bit rate is obtained by calculating: The present invention relates generally to mobile radio systems. NL Ref legal event code: To take into account the fact that one or two RLC data blocks can be transmitted in a radio block, the radio criterion given above may be slightly modified as follows: Mobile radio system, for implementing a method according to one of claims 1 to 10, characterized in that it comprises means for evaluating the quality of a radio link, from the net flow transmitted on said link.

Minimum-shift keying

The higher this number is, the better the radio conditions and thus performance. Ref legal event code: Various modulation techniques are known, characterized by the spectral efficiency, that is to say their ability to transmit a higher or lower number of bits per symbol, for the same allocated frequency band.

However, it is noted that the rate R 0 is only a reference flow and could be calculated differently ie excluding control information “MAC header” and “RLC header”