Method, apparatus and system for orthogonal frequency division multiplexing power control
First Claim
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1. A telecommunications system, comprising:
- a) a hub having a receiver means for receiving orthogonal frequency division multiplexed (OFDM) signals and a transmitter for transmitting OFDM signals over a plurality of first carriers; and
b) a plurality of nodes, each node having a receiver means for receiving OFDM signals and a transmitter means for transmitting OFDM signals, said transmitter means for at least one of said plurality of nodes including means for increasing a transmission power of that node by replicating information transmitted by said transmitter means of that node on a plurality of second carriers.
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Abstract
Data carrier duplication (DCD) is used to implement power control in multipoint-to-point OFDM systems. In DCD, data on several carriers (i.e., frequencies) is utilized in order to increase the power of a channel. Data carrier duplication not only provides power control capabilities, but it also mitigates selective fading problems. In a “closed loop power control” (CLPC) scheme, a hub is provided with certain intelligence which allows it to provide optimal distribution of carriers among nodes. In an “open loop power control” (OLPC) scheme, the nodes are provided with more intelligence to allow them to determine the number of additional carriers they require for transmitting data.
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Citations
36 Claims
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1. A telecommunications system, comprising:
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a) a hub having a receiver means for receiving orthogonal frequency division multiplexed (OFDM) signals and a transmitter for transmitting OFDM signals over a plurality of first carriers; and
b) a plurality of nodes, each node having a receiver means for receiving OFDM signals and a transmitter means for transmitting OFDM signals, said transmitter means for at least one of said plurality of nodes including means for increasing a transmission power of that node by replicating information transmitted by said transmitter means of that node on a plurality of second carriers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A hub for use in an orthogonal frequency division multiplexed (OFDM) telecommunications system having said hub and a plurality of nodes, said hub comprising:
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a) receiver means for receiving orthogonal frequency divisional multiplexed (OFDM) signals;
b) transmitter means for transmitting OFDM signals over a plurality of first carriers; and
c) means for assigning second carriers to the plurality of nodes and for assigning at least one additional second carrier to at least one of the plurality of nodes for carrying a replication of information to be transmitted on an assigned second carrier. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A node for use in an orthogonal frequency division multiplexed (OFDM) telecommunications system having a hub and additional other nodes, said node comprising:
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a) receiver means for receiving orthogonal frequency divisional multiplexed (OFDM) signals from the hub;
b) transmitter means for transmitting information, said transmitter means including means for increasing a transmission power of said node by replicating said information transmitted by said transmitter means simultaneously on a plurality of carriers. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A method for adjusting the transmitting power of a node in an orthogonal frequency division multiplexed (OFDM) telecommunications system having a hub with receiver means and transmitter means and a plurality of nodes each having receiver means and transmitter means, said method comprising:
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a) assigning a node signal carrier to each of said plurality of nodes;
b) estimating signal power of said respective node signal carriers; and
c) adjusting transmitting power of at least one of said plurality of nodes by assigning an additional node signal carrier to that node, such that that node transmits identical information on said additional node signal carrier and on an originally assigned node signal carrier. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification