We claim:
1. A carrier for carrying a roll of metal plate having a hole defined therethrough, comprising:
a frame comprising a base adapted to extend into the hole of the roll; and
a support plate attached to the base of the frame, the support plate having an arcuate outer surface adapted to contact an inner surface of the metal plate.
2. The carrier as recited in claim 1, wherein a flexible cushion is attached to the arcuate outer surface of the support plate, for preventing the roll from being damaged.
3. The carrier as recited in claim 2, wherein the support plate defines a plurality of screw holes, the cushion defines a plurality of bores corresponding to the screw holes, and a plurality of screws extends into the bores and the screw holes for attaching the cushion to the support plate.
4. The carrier as recited in claim 1, wherein at least one rib is attached to the base of the frame, for supporting the support plate.
5. The carrier as recited in claim 1, wherein the frame comprises a beam extending in an upward direction from the base for abutting against the roll, and wherein a shield is attached to the beam for preventing the roll from being damaged by the beam.
6. The carrier as recited in claim 5, wherein the shield has an arcuate bottom edge corresponding to the arcuate outer surface of the support plate.
7. The carrier as recited in claim 5, wherein a top surface of the base of the frame is sloped upwardly from the beam to a free end of the base, for preventing the roll from sliding off the carrier.
8. The carrier as recited in claim 5, wherein the frame further comprises a boom extending from the beam and adapted for carrying the roll.
9. The carrier as recited in claim 8, wherein the boom defines a pair of openings at opposite ends thereof, and wherein the boom and the base extend from the beam in substantially the same direction.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A digital satellite transmission system to transmit a periodic unique word, comprising:
a transmitter to transmit the periodic unique word, the periodic unique word comprising a 64-symbol QPSK modulated waveform with baseband I and Q bits defined as
UWI=0x40F0B6EC088E3A21,
UWQ=0xEB498CA3B538F49D.
2. A digital storage media to store a unique word, comprising:
a memory to store the unique word, the unique word comprising baseband I and Q bits defined as
UWI=0x40F0B6EC088E3A21,
UWQ=0xEB498CA3B538F49D.
3. A frame format of a digital satellite transmission, comprising:
a plurality of frames, each frame having a fixed number of modulated symbols, regardless of a modulation type of the system, and each frame beginning with a unique word, wherein a spacing, in number of symbols, between any two consecutive unique words is identical, regardless of modulation type in the system, and a length of the pilot segments is adjustable.
4. A frame format of a digital satellite transmission, comprising:
a plurality of frames, each frame having a fixed number of modulated symbols, regardless of a modulation type of the system, and each frame beginning with a unique word,
wherein a spacing, in number of symbols, between any two consecutive unique words is identical, regardless of modulation type in the system, and the number of symbols per frame, excluding the unique word, an auxiliary control code and the pilot segments, perfectly accommodates a different number of codewords for each different modulation while maintaining a fixed frame length.
5. A frame format of a digital satellite transmission, comprising:
a plurality of frames, each frame having a fixed number of modulated symbols,
regardless of a modulation type of the system, and each frame beginning with a unique word,
wherein a spacing, in number of symbols, between any two consecutive unique words is identical, regardless of modulation type in the system, and network operation information andor other private information may be transmitted through a plurality of system information in a header of each frame.
6. A digital satellite receiver system to receive a signal with a periodic unique word designed to combat various impairments in satellite communication systems, comprising:
a receiver to receive a signal, wherein the receiver achieves synchronization to the signal based on the periodic unique word that undergoes a special pre-coding before a complex correlator and is QPSK modulated with I and Q defined as
UWI=0\xd740F0B6EC088E3A21
UWQ=0XEB498CA3B538F49D.
7. A digital satellite receiver system to process a received signal, comprising:
a receiver to receive the signal; and a processor to process the signal, wherein the signal comprises a frame format that contains a fixed number of modulated symbols per frame and a unique word at a beginning of each frame, and said receiver can decode all the codewords in a frame based on only a header embedded in the first codeword of the frame, regardless of number of codewords in the frame; the unique word is QPSK modulated with I and Q defined as
UWI=0\xd740F0B6EC088E3A21
UWQ=0XEB498CA3B538F49D.
8. The method of claim 7, wherein said receiver can decode a plurality of FEC codewords in a single frame, regardless of modulation employed.
9. The method of claim 7, wherein said receiver can process an inserted pilot segment of a given length if in a pilot operation mode.
10. The method of claim 9 wherein said receiver can decode network operation information andor other private information located immediately following a header field in each frame for any modulation.
11. A digital communications system, comprising: a transmitter to transmit a digital signal; and wherein the digital signal comprises a plurality of frames, each frame comprising at least one codeword, wherein said system supports at least two different modulations, each of the plurality of frames has the same number of symbols, and a first codeword in each frame comprises a header, the header comprising a plurality of system information to transmit network operator information.