Index_Q

Q

quadrature amplitude modulation (QAM), 23, 212

quadrature phase shift keying (QPSK), 19, 22, 23

quality of life and wireless, 10-11

quality of service (QoS), 7-9, 53, 106, 107, 121-139, 158, 197, 213, 330, 331-332

802.11e and, 150-154

acknowledgment (ACK) in, 146

arbitration interframe space (AIFS) in, 150

attenuation in, 220-224

bandwidth management in, 127

basic service sets (BSS) in, 145

carrier sense multiple access with collision avoidance (CSMA/CA) and, 143-148

carrier sense multiple access with collision detection (CSMA/CD), 143

challenges of, 139-140

clear channel assessment (CCA) in, 144

coax and connector loss in, 219-220, 219

compression/decompression in, 178

delay and, 123-125, 127, 129, 175-177

diffraction loss, 219

DiffServ and, 127, 130-133

distributed coordination function (DCF) in, 142, 143, 143

dropped packets and, 133, 177-178, 187

echo in, 125-126, 187

enhanced DCF (EDCF) in, 142, 151-152, 151

factors affecting, 122-123

fade, 218-219

fragmentation of data and, 148, 149

grade of service (GoS) and, 131

hybrid coordination function (HCF) in, 142, 150, 151, 152-154

improving, networkwide, 127-139

interference and, 107-118

interframe spaces in, 146-147, 150

IP networks and, 121-139

jitter in, 178, 186

label switching using multiprotocol label

switching (MPLS) in, 127, 134-139

latency and, 140-142, 175-177

legacy 802.11 MAC and, 142-143

logical link control (LLC) in, 148-149

MAC protocol data units (MPDU) in, 146-147

mean opinion score (MOS) in, 135, 173-174, 183

media access control (MAC) and, 150-154

need for, 139-142

network allocation vector (NAV) and, 146

per hob behaviors in, 131

perceptual speech quality measurement (PSQM) in, 173, 174-175, 175

point coordination function (PCF) in, 142, 143, 143, 149

prioritization in, 127

queuing delay in, 129-130

receiver and transmitter addresses in, 146

request to send (RTS) and clear to send (CTS) frames in, 145, 145

resource reservation protocol (RSVP) in, 127-130

routers and gateways, improving QoS in, 123

security and, 79

signal to noise ratio (SNR), 225, 226

silence suppression or voice activation detection (VAD), 126

standards for, 122, 142

transmit opportunity (TXOP) in, 152, 153-154

virtual carrier sense protocol in, 147-148, 147

voice over IP (VoIP) and, 164, 172, 173-178, 332-333

quasi-property-rights model for frequency spectrum, 323-324

queuing delay, 129-130



Wi-Fi Handbook(c) Building 802.11b Wireless Networks
Wi-Fi Handbook : Building 802.11b Wireless Networks
ISBN: 0071412514
EAN: 2147483647
Year: 2003
Pages: 96

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