Emerging Wireless LANs Wireless PANs and Wireless MANs

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Extra info for Emerging Wireless LANs Wireless PANs and Wireless MANs

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11e amendment. By removing the need for one ACK for every data frame, the amount of overhead required for the ACK frames, as well as preamble and framing, is considerably reduced. BAs are helpful, but only if all the frames in a burst can be delivered without any problem. Missing one frame in the block or losing the ACK itself carries a steep penalty in protocol operations since the entire block must be retransmitted again. 11n MAC, frame aggregation is also expected to be a mandatory MAC entity component.

3 THIRD-PARTY-BASED CENTRALIZED WLAN RESOURCE MANAGEMENT 33 The LNC gathers the measured resource usage statistics from all the APs via simple network management protocol (SNMP) [28]. SNMP also provides security-related functions such as user authentication and message encryption [29]. Most enterprise-class APs can support SNMP [2]. APs collect signal characteristics from client stations in each domain. 11 WLAN standard. 11k task group, a portion of the signal characteristics are obtained directly from the WLAN cluster.

The reason interleaving is used in OFDM is to attempt to spread the errors out in the bit stream presented to the error correction decoder. A common type of error correction coding scheme used with OFDM-based systems is convolutional coding, which is often concatenated with Reed– Solomon coding. Convolutional coding is used as the inner code and Reed– Solomon coding is used for the outer code, usually with additional interleaving on top of the time and frequency interleaving and between the two layers of coding.

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