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.
|Published (Last):||18 June 2006|
|PDF File Size:||4.20 Mb|
|ePub File Size:||1.40 Mb|
|Price:||Free* [*Free Regsitration Required]|
TR Free format text: The transmitter 1 comprises, in the example illustrated: SE Free format text: Conversely, the transmitter 1 may be in the network and the receiver 2 in a mobile station. Apparatus and method for channel quality estimation and link adaptation in orthogonal frequency division multiplexing OFDM wireless communication system.
Equivalently, this expression can be written: However, this criterion does not constitute the most relevant criterion, in particular when using techniques such as link adaptation or incremental redundancy techniques recalled above. In addition, the following radio criterion the invention has been mainly described in the case where the re-transmission technique is used. Method according to one of claims 5 and 6, characterized in that said reference modulation is lower spectral efficiency.
Entity according to claim 14, characterized in that said link is a downlink. A need therefore cokrs 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.
This technique therefore also as the technical link adaptation to increase the throughput, but as the BLER can then modulatioon much higher than in the case where this technique is not used, this criterion is not not the most relevant.
Net R can take any positive value.
P nikitin pdf
A1 Designated state s: Another drawback of quality modullation such as the raw BER or the SIR is that they are not directly representative of performance. BLER is the rate of data blocks received incorrectly.
The radio criterion proposed according to the invention is then calculated for each TBF separately. Similarly, when using the technique of re-transmission blocks received incorrectly, the BLER does not constitute the most appropriate criterion.
Mobile station according to claim 17, characterized in that said link is an uplink. Instead of re-transmitting a block with always the same encoding scheme, it is to re-transmit the block with a different encoding scheme to each time, and to jointly utilize the block successive retransmissions to reduce the likelihood not decode correctly.
CH Ref legal event code: Moxulation 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 clurs number of bits in a block using the reference modulation e.
CY Free format text: From this point of view, the BLER is a relevant criterion, or more representative performance.
Minimum-shift keying — Wikipédia
The blocks can then be transmitted without any protection on their first transmission. The net flow rate can be expressed as follows: In systems such as eg GPRS and EGPRS systems, the correct or incorrect status of blocks received necessary for the following quality assessment one or other of the above expressions can be obtained as follows.
According to another feature, the number of bits of blocks transmitted being a function of the modulation scheme used, the raw data rate is determined for a given modulation scheme corresponding to said modulation reference, regardless of the modulation scheme used. One drawback of quality indicators such as the raw BER or the SIR is that unlike the BLER, they require an estimate to be obtained, resulting in a risk of errors and thus degradation of performance of these systems.
NL Ref legal event code: AT 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 vours symbol, for the same allocated frequency band.
Net R net debit however, may not be the most appropriate criterion for R net depends not only on the radio conditions but also the allocated radio resources for radio conditions data, plus the allocated radio resources, the greater net R is high.
Non-correctly received blocks can be blocks in which errors are detected by means of a code error detectoror can not be corrected by means of an error correcting code.
The radio criterion consisting of BLER may be used otherwise.