Ec8004 wireless networks unit 1 ieee 802.11a and ieee 802.11b
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IEEE 802.11b operates in the 2.4 GHz band with data rates from 1-11 Mbps and a transmission range of 300m outdoors and 30m indoors. It has wide manufacturer support and is inexpensive, making it suitable for home networks. Limitations include slow speeds, limited simultaneous users, and lack of scalability. IEEE 802.11a operates in the 5 GHz band with higher data rates from 6-54 Mbps but shorter transmission ranges of 100m outdoors and 10m indoors. It uses OFDM modulation like BPSK, QPSK, 16-QAM and 64-QAM. It has faster speeds than 802.11b but shorter ranges.
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Ec8004 wireless networks unit 1 ieee 802.11a and ieee 802.11b
- 1. IEEE 802.11b
- 2. WLAN: IEEE 802.11b Data rate 1, 2, 5.5, 11 Mbit/s, depending on SNR User data rate max. approx. 6 Mbit/s Transmission range 300m outdoor, 30m indoor Max. data rate ~10m indoor Frequency Free 2.4 GHz ISM-band Advantages: Widely supported by manufacture and very cost effective Suits well for home segment due to lower costs and simple set-up. Easy to set-up and maintain. Disadvantages: a. Transmission speed is slow b. Provides access to few users simultaneously. c. Doesn’t provide suitable scalability,
- 3. IEEE 802.11b PHY PACKET FORMATS
- 5. IEEE 802.11a
- 6. WLAN: IEEE 802.11a Data rate 6, 9, 12, 18, 24, 36, 48, 54 Mbit/s, depending on SNR User throughput (1500 byte packets): 5.3 (6), 18 (24), 24 (36), 32 (54) 6, 12, 24 Mbit/s mandatory Transmission range 100m outdoor, 10m indoor E.g., 54 Mbit/s up to 5 m, 48 up to 12 m, 36 up to 25 m, 24 up to 30m, 18 up to 40 m, 12 up to 60 m Frequency FCC (US) 5.15-5.25, 5.25-5.35, 5.725-5.825 GHz ISM-band ETSI (Europe) 5.15 – 5.35 GHz, 5.47 – 5.725 GHz Modulation BPSK, QPSK, 16 – QAM and 64 - QAM
- 7. Usage of OFDM in IEEE 802.11a
- 8. IEEE 802.11a Physical Layer PDU
- 9. Difference between IEEE 802.11b and 802.11a PARAMETERS IEEE 802.11b IEEE 802.11a DATA RATE TRANSMISSION RANGE FREQUENCY MODULATION 1, 2, 5.5 ,11 Mbit/s 6, 9, 12, 18, 24, 36, 48, 54 Mbit/s 300m outdoor, 30m indoor 100m outdoor, 10m indoor 2.4 GHz 5 GHz 1 & 2 Mbit/s – DBPSK & DQPSK 5.5, 11 Mbit/s – CCK, PBCC BPSK, QPSK, 16-QAM and 64-QAM