摘要:
A radio communications system provides frequency channels which are formed both by time slots and by broadband frequency ranges, and in which information from a plurality of connections is simultaneously transmitted between mobile stations and base stations wherein it is possible to distinguish the information from different connections in accordance with a connection-specific fine structure. Frequency channels are repeatedly provided for time synchronization of the mobile stations in the downward direction in which a signal form is transmitted in addition to information from further connections. The mobile station to be synchronized determines from received signals at least one instant of the arrival of the signal form, which is subsequently used by the mobile station for time synchronization. The system is advantageously applied, for example, in TDD mode for the third mobile communications generation which combines a TDMA and CDMA subscriber separation method.
摘要:
A TDMA/CDMA radio communications system provides frequency channels which are formed both by time slots and by broadband frequency ranges, and in which information from a plurality of connections can be simultaneously transmitted between mobile stations and a base station wherein it is possible to distinguish the information from different connections in accordance with a connection-specific fine structure. Frequency channels are repeatedly provided for frequency synchronization of the mobile stations in the downward direction in which a symbol sequence is transmitted. From received signals, the mobile station to be synchronized determines estimated values for the symbol sequence and compares these estimated values with a reference sequence. It is thereby possible to calculate a phase drift in the estimated values with reference to the reference sequence wherein a frequency offset, which is used for frequency synchronization, is determined from the phase drift.
摘要:
A mobile radio telephone system comprises a plurality of operatively coupled base stations, having first and second radio communications apparatus which operate to effect radio communications with at least one mobile station via first and second radio signals with radio frequencies which occupy common parts of the radio frequency spectrum, wherein a frequency re-use pattern associated with the first radio communications apparatus is substantially matched to a frequency re-use pattern associated with the second radio communications apparatus.
摘要:
A process and installation for producing reinforcement wire meshes by welding longitudinal and transverse wires (L, Q) together at their crossing points, leaving ends (E) or the transverse wires projecting beyond the longitudinal edge wires using a continuous wire meshes welding machine, in which, in order to produce reinforcement wire meshes where at least one of the projecting ends or the transverse rods is bent back towards the longitudinal edge wire in the form or a loop and welded thereto, straight transverse wires are supplied, at least one of the ends in front of the weld line of the wire meshes welding machine is bent back in the form of a loop towards the longitudinal edge wire (L') and the loop end (S) is welded to the longitudinal edge wire in the weld line (C) at the same time as the longitudinal and transverse wires are welded together.
摘要:
Reinforcement body for a cast concrete floor slab provided with stiffening ribs, having a foundation reinforcement (1), a distribution reinforcement (2) and at least one displacement body (8) e.g. of polystyrene foam, arranged between these reinforcements which delimits cavities to accept the stiffening ribs. The displacement body is rigidly fixed between the reinforcements by means of spacer wires (7) connecting the foundation reinforcement to the distribution reinforcement (2) at a selectable distance, e.g. by passing through the displacement body, so that the foundation reinforcement, the distribution reinforcement and the displacement body form a dimensionally stable unit. Additional reinforcement elements (10, 11, 15), can be placed in the rib cavities (9). The cavities are either formed in a one-part displacement body or formed between several displacement bodies and having predetermined directional course in the reinforcement body and predetermined width, in accordance with the static requirements of the floor slab including the stiffening ribs.
摘要:
Process and device for guiding wire sections through an intermittently advanced insulating body, consisting at least partially of non-pliable material, of a component; wherein, between successive advancing steps a channel for receiving the wire is initially formed in the insulating body and only then is the wire advanced by a wire supply guided through the reception channel from one of the two sides of the insulating body.
摘要:
Apparatus for loading a grid-welding machine with elongate elements, comprising, evenly spaced from each other and arranged transverse to the feed direction in a feed plane, means (1) for inserting the elongate elements into feed channels (K) mounted in the feed plane for pivotal movement transverse to the feed direction, each feed channel being laterally confined by guide members (5) fixedly connected to the insertion member and individually pivotable transverse to the feed direction, the free ends of the guide members being releasably fixable to the inlet end of downstream feed members (7) of the welding machine by guide means (15, 16) mounted on the feed members, the feed members transversely moveable relative to the feed direction being adjustable to freely selectable transverse spacings and each feed member being connectable to one or more feed channels by the guide members.
摘要:
A bending mechanism for wire or strip material is provided, which is intended in particular for bending back towards the edge longitudinal wires the projecting end portions of crosswires of reinforcement grids for reinforced concrete construction. The mechanism comprises a substantially circular-sectioned cylindrical bending form, and a bending-tool eccentrically mounted on a rotatable tool carrier which can be rotated in either direction about the axis of the bending-form. The bending-form is shiftable along said axis between a working position, in which the end faces of said tool carrier and said bending-form are substantially touching, and a rest position in which said two end faces define between them a gap for the passage of a wire which is to be bent, in particular a crosswire of a reinforcement grid.
摘要:
A grid mat consists of longitudinal (L) and transverse (Q) wires welded to one another, in which at least some transverse wires project beyond the longitudinal edge wires and are bent back to these in the form of loops (S).For the purpose of space-saving stacking of the grid mats in the same way and with the same devices as used for grid mats with perfectly straight longitudinal and transverse wires, at each mat edge at least the curved parts of the loops (S) formed by the ends of the transverse wires are angled or curved out of the plane of the transverse wires (Q) so far in the direction of the plane of the longitudinal wires (L) that the arches of the loops lie between these two planes.
摘要:
Grid bodies which consist of two parallel plane grid mats of longitudinal and transverse wires crossing one another and welded together at the points of cross, and of spacer wires, which hold the mats spaced apart and which are welded at each end to one wire of one of the two grid mats, are produced in a continuous method and in such a way that if necessary an insulating core may be introduced into the grid body during its production. For this purpose two widths (3,4) of grid matting are drawn off in steps from stock coils (1,2), straightened and arranged at a distance apart. Simultaneously a number of wires (22,23) are drawn off in steps from stock coils (20,21), straightened and introduced through one (3) of the widths (3,4) of grid matting from the side into the gap between the widths of grid matting, welded to one wire in each width of grid and separated from the wire stock.