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Sociedade Brasileira de Telecomunicações

2010 - VII International Telecommunications Symposium



System-Level Analysis of Outer Loop Link Adaptation on Mobile WiMAX Systems

Link adaptation is a process of paramount importance to optimize the performance of wireless communication systems. However, standardization committees have ...

SBrT 2010


Synchronization of Legacy 802.11a/g Devices Operating in IEEE 802.11n Networks

It is investigated the performance of legacy IEEE 802.11a time synchronization algorithms when the synchronization preamble is transmitted by IEEE 802.11n ...

SBrT 2010


Performance Analysis of HARQ in WiMAX Networks Considering Imperfect Channel Estimation

Hybrid Automatic Repeat Query (HARQ) is an error correction technique that has become an integral part of most current broadband wireless standards such a...

SBrT 2010


On the Impact of Non-Linear High Power Amplifiers on Coded OFDM

The high peak-to-average power ratio (PAPR) is one of the main disadvantages of OFDM systems, which reduces the transmission efficiency with non-linear pow...

SBrT 2010


Controlling the Peak-to-Average Power Ratio in the Downlink of WiMAX Systems

It is well known that one of the main implementation issues in multicarrier modulation schemes, like OFDM, is their high peak-to-average power ratio (PAPR)....

SBrT 2010