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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
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