OVSF code streams, 181 Physical radio layer, 181 Oyster cards, 358 Pico cells, 157 Piezoelectric effect, 119 P frames, 190 Piezoelectric microphones, 131 P25 dual mode radio, 310-311, 313 PIFA antennas, 153, 156 Index PIR detectors, 348 Q factor, 182 Pixel probability, 214-15 Q filters, 149, 212 Pixel resolution, 183 QAM schemes, 35 Plane switching, displays and visual acuity, QC, 367 QCIF, 200, 182 Plante, Gaston, 139 QOS, 70-71, 350 Plasma screen, 167, 169 QPSK, 281, 306, 326 Plaxo, 222 Quad band, 116, 121, 144 PMR (private mobile radio), 305 Quadrature amplitude modulation, 39 Pocket Communications, 3 Qualcom, 137, 178-9, 280, 282, 299 Point coordination (PC) functions, 71 Quality of User Experience Service, 299 Point to multipoint, 258 Quantisation, 189, 191 Point to point microwave, 257 Quantum Efficiency (QE), 187 Polar modulation, 111 Quick Time movie, 210 Polarisation mode dispersion (PMD), Quintuple band, 144 QVGA, 200 Polarization multiplexing, 260 QWERTY keyboard, 130, 137 Population inversion, 24 Portable entertainment systems, 170 R and D, 82, 91, 97, 106, 123, 161, 224, Portable Morse-code transceivers, 125 271-2, 301, 375, 377, 380-381 Positioning capabilities, 132 Racal, 270 Positioning domain, 378 Rademacher, Hans, 58, 60 Post Office Act of 1969, 270-271 Radiation efficiency, 156 Post office cost/efficiency equation, 6, 7 Radio broadcasting, 20, 22 Postal service, 240, 254 Radio telephony, 125 Power amplifier see PA, 150 Radio waves, 211 Power and water economy, 243 Radio-frequency transmission, 43 Power consumption, 79, 205 Ramanujan, Srinivasa, 388 Power control, 72, 76-7, 372-3 Rambus, 178 Power drain, 53, 177, 207 Rapid Spanning Tree Protocol, 263 Power efficiency, 15, 56, 70, 77-9, 89, 110, Rayleigh scattering, 27 119-20, 146, 150, 177-8, 181, 280, 282, RCA Victor Company, 167 290, 370, 373 Real-Time Network, 335 Power handling requirements, 152 Real-time operating system, 335 Preamble overheads, 74 Receive sensitivity, 76-7, 83, 87, 156 Processor architectures, 177, 179-81 Receiver noise, 2