Method, apparatus and computer program product providing randomized relay network
AssigneeNokia Siemens Networks Oy
InventorAri Hottinen
Life of this patent
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Abstract
A relay node is provided for being interposed between at least one source node and at least one destination node. The relay node includes a receiver, a transmitter and a control unit. A transmission signal transmitted by the at least one source node is received by the relay node and modified by the control unit in a substantially pseudo-random manner to generate a time-varying signal that is transmitted by the relay node to the at least one destination node.
Claims47
A relay node for being interposed between at least one source node and at least one destination node, comprising:
- a data processor;
- and
- a memory storing computer program code, the memory and the computer program code being configured to, with the data processor, cause the relay node at least to perform:
- receive a transmission signal from the at least one source node;
- and
- modify the received transmission signal in a substantially pseudo-random manner to generate a time-varying signal that is to be transmitted by the relay node to the at least one destination node, wherein a complex channel h23 between the relay node (node 2) and the at least one destination node (node 3) is modified at a time slot t to:
- {tilde over (h)}23[t]=√{square root over (p2[t])}w2[t]h23
- where p2[t] is a transmit power of the relay node and w2[t] is a unit-power complex-valued coefficient applied at the relay node.
A relay node for being interposed between at least one source node and at least one destination node, comprising:
- a data processor;
- and
- a memory storing computer program code, the memory and the computer program code being configured to, with the data processor, cause the relay node at least to perform:
- receive a transmission signal transmitted from the at least one source node;
- and
- modify the received transmission signal to generate a time-varying signal that is to be transmitted by the relay node to the at least one destination node,
- wherein a complex channel h23 between the relay node (node 2) and the at least one destination node (node 3) is modified at a time slot t to:
- {tilde over (h)}23[t]=√{square root over (p2[t])}w2[t]h23
- where p2[t] is a transmit power of the relay node and w2[t] is a unit-power complex-valued coefficient applied at the relay node, and
- wherein factors √{square root over (p2[t])}w2[t] are selected such that a received signal power is made to combine coherently at the at least one destination node and a received noise power is made to combine incoherently at the at least one destination node.
A relay device comprising:
- control means coupled to receiver means and transmitter means, said control means for modifying a received signal in a substantially pseudo-random manner to generate a time-varying signal that is to be transmitted by the transmitter means, wherein a complex channel h23 between the relay device (node 2) and at least one destination node (node 3) is modified at a time slot t to:
- {tilde over (h)}23[t]=√{square root over (p2[t])}w2[t]h23
- where p2[t] is a transmit power of the relay device and w2[t] is a unit-power complex-valued coefficient applied at the relay device.
A wireless communication system comprising a plurality of relay nodes interposed between at least one source node and at least one destination node, wherein each relay node of the plurality of relay nodes comprises a data processor and a memory storing computer program code, the memory and the computer program code being configured to, with the data processor, cause the relay node at least to perform:
- receive a transmission signal;
- and
- modify the received transmission signal in a substantially pseudo-random manner to generate a time-varying signal that is to be transmitted by the relay node performing the modification, wherein the relay node comprises an in-band relay node, wherein a complex channel h23 between the relay node (node 2) and the at least one destination node (node 3) is modified at a time slot t to:
- {tilde over (h)}23[t]=√{square root over (p2[t])}w2[t]h23
- where p2[t] is a transmit power of the relay node and w2[t] is a unit-power complex-valued coefficient applied at the relay node.
A method for relaying a signal comprising:
- receiving, by a relay node, a transmission signal from at least one source node, wherein the relay node is interposed between the at least one source node and at least one destination node;
- and
- modifying, by the relay node, the received transmission signal in a substantially pseudo-random manner to generate a time-varying signal that is to be transmitted by the relay node to the at least one destination node, wherein a complex channel h23 between the relay node (node 2) and the at least one destination node (node 3) is modified at a time slot t to:
- {tilde over (h)}23[t]=√{square root over (p2[t])}w2[t]h23
- where p2[t] is a transmit power of the relay node and w2[t] is a unit-power complex-valued coefficient applied at the relay node.
A non-transitory computer-readable medium storing program instructions, execution of the program instructions by a relay node resulting in operations comprising:
- receiving a transmission signal from at least one source node, wherein the relay node is interposed between the at least one source node and at least one destination node;
- and
- modifying the received transmission signal in a pseudo-random manner to generate a time-varying signal that is to be transmitted by the relay node to the at least one destination node, wherein a complex channel h23 between the relay node (node 2) and the at least one destination node (node 3) is modified at a time slot t to:
- {tilde over (h)}23[t]=√{square root over (p2[t])}w2[t]h23
- where p2[t] is a transmit power of the relay node and w2[t] is a unit-power complex-valued coefficient applied at the relay node.
Dependencies are inferred from the claim text.