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A
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SECTION A — HUMAN NECESSITIES
B
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SECTION B — PERFORMING OPERATIONSTRANSPORTING
C
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SECTION C — CHEMISTRYMETALLURGY
D
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SECTION D — TEXTILESPAPER
E
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SECTION E — FIXED CONSTRUCTIONS
F
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SECTION F — MECHANICAL ENGINEERINGLIGHTINGHEATINGWEAPONSBLASTING
G
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SECTION G — PHYSICS
H
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SECTION H — ELECTRICITY
H01
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BASIC ELECTRIC ELEMENTS
H02
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GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
H03
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BASIC ELECTRONIC CIRCUITRY
H04
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ELECTRIC COMMUNICATION TECHNIQUE
H04B
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TRANSMISSION [4]
H04B 1/00
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Details of transmission systems, not covered by a single one of groups H04B 3/00-H04B 13/00Details of transmission systems not characterised by the medium used for transmission [4]
H04B 1/02
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Transmitters
H04B 1/03
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. . Constructional details, e.g. casings, housings [2]
H04B 1/034
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. . . Portable transmitters [2]
H04B 1/036
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. . . Cooling arrangements [2]
H04B 1/04
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. . Circuits
H04B 1/06
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Receivers
H04B 1/08
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. . Constructional details, e.g. cabinet
H04B 1/10
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. . Means associated with receiver for limiting or suppressing noise or interference
H04B 1/12
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. . . Neutralising, balancing, or compensation arrangements
H04B 1/14
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. . . Automatic detuning arrangements
H04B 1/16
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. . Circuits
H04B 1/18
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. . . Input circuits, e.g. for coupling to an aerial or a transmission line (coupling networks between aerials or lines and receivers independent of the nature of the receiver H03H)
H04B 1/20
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. . . for coupling gramophone pick-up, recorder output, or microphone to receiver
H04B 1/22
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. . . for receivers in which no local oscillation is generated
H04B 1/24
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. . . . the receiver comprising at least one semiconductor device having three or more electrodes
H04B 1/26
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. . . for superheterodyne receivers (multiple frequency-changing H03D 7/16)
H04B 1/28
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. . . . the receiver comprising at least one semiconductor device having three or more electrodes
H04B 1/30
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. . . for homodyne or synchrodyne receivers (demodulator circuits H03D 1/22)
H04B 1/38
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Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
H04B 1/40
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. . Circuits
H04B 1/44
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. . . Transmit/receive switching [2]
H04B 1/46
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. . . . by voice-frequency signalsby pilot signals
H04B 1/48
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. . . . in circuit for connecting transmitter and receiver to a common transmission path, e.g. by energy of transmitter
H04B 1/50
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. . . using different frequencies for the two directions of communication
H04B 1/52
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. . . . Hybrid arrangements, i.e. for transition from single-path two-way transmission to single transmission on each of two paths, or vice versa
H04B 1/54
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. . . using the same frequency for both directions of communication (H04B 1/44 takes precedence)
H04B 1/56
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. . . . with provision for simultaneous communication in both directions
H04B 1/58
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. . . . Hybrid arrangements, i.e. for transition from single-path two-way transmission to single transmission on each of two paths, or vice versa
H04B 1/59
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RespondersTransponders
H04B 1/60
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Supervising unattended repeaters
H04B 1/62
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for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio
H04B 1/64
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. . Volume compression or expansion arrangements
H04B 1/66
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for reducing bandwidth of signalsfor improving efficiency of transmission (H04B 1/68 takes precedence)
H04B 1/68
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for wholly or partially suppressing the carrier or one side band [4]
H04B 1/69
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Spread spectrum techniques [6, 2011.01]
H04B 1/692
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. . Hybrid techniques using combinations of two or more spread spectrum techniques [2011.01]
H04B 1/707
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. . using direct sequence modulation [6, 2011.01]
H04B 1/7073
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. . . Synchronisation aspects [2011.01]
H04B 1/7075
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. . . . with code phase acquisition [2011.01]
H04B 1/7077
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. . . . . Multi-step acquisition, e.g. multi-dwell, coarse-fine or validation [2011.01]
H04B 1/708
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. . . . . Parallel implementation [2011.01]
H04B 1/7083
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. . . . Cell search, e.g. using a three-step approach [2011.01]
H04B 1/7085
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. . . . using a code tracking loop, e.g. a delay-locked loop [2011.01]
H04B 1/7087
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. . . . Carrier synchronisation aspects [2011.01]
H04B 1/709
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. . . Correlator structure [2011.01]
H04B 1/7093
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. . . . Matched filter type [2011.01]
H04B 1/7095
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. . . . Sliding correlator type [2011.01]
H04B 1/7097
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. . . Interference-related aspects [2011.01]
H04B 1/71
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. . . . the interference being narrowband interference [2011.01]
H04B 1/7103
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. . . . the interference being multiple access interference [2011.01]
H04B 1/7105
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. . . . . Joint detection techniques, e.g. linear detectors [2011.01]
H04B 1/7107
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. . . . . Subtractive interference cancellation [2011.01]
H04B 1/711
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. . . . the interference being multi-path interference [2011.01]
H04B 1/7113
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. . . . . Determination of path profile [2011.01]
H04B 1/7115
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. . . . . Constructive combining of multi-path signals, i.e. RAKE receivers [2011.01]
H04B 1/7117
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. . . . . . Selection, re-selection, allocation or re-allocation of paths to fingers, e.g. timing offset control of allocated fingers [2011.01]
H04B 1/712
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. . . . . . Weighting of fingers for combining, e.g. amplitude control or phase rotation using an inner loop [2011.01]
H04B 1/713
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. . using frequency hopping [6, 2011.01]
H04B 1/7136
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. . . Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform [2011.01]
H04B 1/7143
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. . . Arrangements for generation of hop patterns [2011.01]
H04B 1/715
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. . . Interference-related aspects [2011.01]
H04B 1/7156
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. . . Arrangements for sequence synchronisation [2011.01]
H04B 1/7163
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. . using impulse radio [2011.01]
H04B 1/717
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. . . Pulse-related aspects [2011.01]
H04B 1/7176
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. . . Data mapping, e.g. modulation [2011.01]
H04B 1/7183
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. . . Synchronisation [2011.01]
H04B 1/719
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. . . Interference-related aspects [2011.01]
H04B 1/72
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Circuits or components for simulating aerials, e.g. dummy aerials
H04B 1/74
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for increasing reliability, e.g. using redundant or spare channels or apparatus [3]
H04B 1/76
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Pilot transmitters or receivers for control of transmission or for equalising [3]
H04B 3/00
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Line transmission systems (combined with near-field transmission systems H04B 5/00)
H04B 5/00
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Near-field transmission systems, e.g. inductive loop type
H04B 7/00
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Radio transmission systems, i.e. using radiation field (H04B 10/00, H04B 15/00 take precedence)
H04B 10/00
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Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication [5, 2013.01]
H04B 11/00
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Transmission systems employing ultrasonic, sonic or infrasonic waves
H04B 13/00
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Transmission systems characterised by the medium used for transmission, not provided for in groups H04B 3/00-H04B 11/00
H04B 14/00
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Transmission systems not characterised by the medium used for transmission (details thereof H04B 1/00) [4]
H04B 15/00
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Suppression or limitation of noise or interference (by means associated with receiver H04B 1/10)
H04B 17/00
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MonitoringTesting [2]
H04H
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BROADCAST COMMUNICATION (multiplex communication H04J; pictorial communication aspects of broadcast systems H04N)
H04J
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MULTIPLEX COMMUNICATION (peculiar to transmission of digital information H04L 5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N 7/08; in exchanges H04Q 11/00)
H04K
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SECRET COMMUNICATIONJAMMING OF COMMUNICATION
H04L
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TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) [4]
H04M
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TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08)
H04N
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PICTORIAL COMMUNICATION, e.g. TELEVISION [4]
H04Q
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SELECTING (switches, relays, selectors H01H;  wireless communication networks H04W) [1, 2009.01]
H04R
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LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERSDEAF-AID SETSPUBLIC ADDRESS SYSTEMS (generating mechanical vibrations in general B06B; transducers for measuring particular variables G01; transducers in clocks G04; producing sounds with frequency not determined by supply frequency G10K; transducers in recording or reproducing heads G11B; transducers in motors H02) [6]
H04S
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STEREOPHONIC SYSTEMS (information storage on discs or tapes G11B; broadcast systems for the distribution of stereophonic information H04H 20/88; multiplex systems in general H04J) [3]
H04W
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WIRELESS COMMUNICATION NETWORKS [2009.01]
H05
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ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
H99
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SUBJECT MATTER NOT OTHERWISE PROVIDED FOR IN THIS SECTION [2006.01]

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