80211b hr dsss a high-rate dsss using a 24 ghz
802.11b HR DSSS
a) High-rate DSSS using a 2.4 GHz band
b) Similar to DSSS excluding for encoding method
c) Uses complementary code keying (CCK), encoding 4 or 8 bits to one CCK symbol
d) Defines four data rates: 1, 2, 5.5 and 11 Mbps
Expected delivery within 24 Hours
selective repeat arq - processing at the receiver additionally complex- the window size is reduced to 2m-1 2m2 at most- both the transmitter as well
q explain about bandwidth ndash delay productbandwidth - delay product - a measure of competence of arq system bandwidth bits per second round-trip
q calculate utilization percentage of the link- system stop and wait arq- bandwidth 1mbps- round trip for one bit 20ms- frame length 1000
80211a ofdma orthogonal frequency-division multiplexing utilizing a 5-ghz bandb same as fdm except all sub bands are used by only one source at a
80211b hr dsss a high-rate dsss using a 24 ghz bandb similar to dsss excluding for encoding methodc uses complementary code keying cck encoding 4 or
80211g ofdm a uses ofdm with same 24 ghz bandb achieves a 54-mbps data ratec works with same 80211b
q explain full duplex data transmission- have two separate communication channels as well as use each one for simplex data traffic in different
carrier sense multiple accesscollision avoidancea necessary since wireless lans cannot implement csmacdb collision detection requires increased
fragmentation- wireless environment is very noisy- corrupt frames must be retransmitted- large frames must be divided into smaller ones to increase
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