802.11 slot time propagation delay
Throughput and Delay Limits of IEEE Transmission time for a symbol. Propagation delay. and delay limits of IEEE - IEEE Communications Letters. Propagation delay inﬂuence in IEEE outdoor networks Keywords WLAN IEEE MAC Propagation delay Slot time 1 Introduction. IEEE MAC −→ CSMA/CA with → CW is in units of slot time.
Propagation delay influence in IEEE 802.11 outdoor networks
In telecommunications , guard intervals are used to ensure that distinct transmissions do not interfere with one another, or otherwise cause overlapping transmissions.
The purpose of the guard interval is to introduce immunity to propagation delays, echoes and reflections, to which digital data is normally very sensitive. In OFDM , the beginning of each symbol is preceded by a guard interval. As long as the echoes fall within this interval, they will not affect the receiver's ability to safely decode the actual data, as data is only interpreted outside the guard interval. In TDMA , each user's timeslot ends with a guard period, to avoid data loss and to reduce interference to the following user, caused by propagation delay.
Thus a user's timeslot is protected from interference from the preceding user, by the guard interval guard period at the end of that preceding user's timeslot. Longer guard periods allow more distant echoes to be tolerated.
However, longer guard intervals reduce the channel efficiency. For example, in DVB-T , four guard intervals are available given as fractions of a symbol period:. Ideally, the guard interval is just longer than the delay spread of the channel. The standard symbol guard interval used in To increase data rate, A scheme could be developed to work out whether a short guard interval would be of benefit to a particular link.
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А может и не стоит ее сдерживать и тем более стыдиться.
Девочка же показала себя с самой лучшей стороны, устроив парню такой страстный интим, что челюсть может отпасть от наблюдения за подобным трахом. Девушки проводят время на пляже, загорая топлес и завлекая мужчин своими голыми телами и красивыми сиськами. that pushed the disease way down the ladder of people's priorities," admitted another.
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