Spatial multiplexing gain for a distributed cooperative communications system using randomized coding
AssigneePolytechnic Institute of New York University
InventorsElza Erkip, Thanasis Korakis, Pei Liu, Shivendra S. Panwar
Life of this patent
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Abstract
Multiple cooperative relays operate in a highly mobile environment and form a virtual antenna array. Multiple independent streams of data can be simultaneously, transmitted in parallel to the destination receiver. Thus a higher spatial multiplexing gain can be obtained. Each relay device that receives the information without errors splits it into multiple streams. For example, if the relay devices receive B symbols and the number of streams is K, each stream contains B/K symbols. Each relay device then generates a random linear combination of all the streams and transmits this output simultaneously with the other relay devices.
Claims20
A method for transmitting data from a source wireless device to a destination wireless device, the method comprising:
- a) receiving, with each of a plurality of relay wireless devices, a transmission of the data from the source wireless device;
- b) splitting, with each of the plurality of relay wireless devices, the received transmission into K streams;
- c) encoding, with each of the plurality of relay wireless devices, each of the K streams;
- d) applying, with each of the plurality of relay wireless devices, multiple-input-multiple-output (MIMO) encoding to the K encoded streams to generate K parallel streams;
- e) independently generating, with each of the plurality of relay wireless devices, a random vector of length K;
- f) linearly combining, with each of the plurality of relay wireless devices, the K parallel streams using the random vector to obtain an output signal;
- and
- g) transmitting, with each of the plurality of relay wireless devices, the output signal to the destination device.
A method comprising:
- a) receiving, with one of a plurality of relay wireless devices, a transmission of data from a source wireless device;
- b) splitting, with the one relay wireless device, the received transmission into K streams;
- c) encoding, with the one relay wireless device, each of the K streams;
- d) applying, with the one relay wireless device, multiple-input-multiple-output (MIMO) encoding to the K encoded streams to generate K parallel streams;
- e) independently generating, with the one relay wireless device, a random vector of length K;
- f) linearly combining, with the one relay wireless device, the K parallel streams using the random vector to obtain an output signal;
- and
- g) transmitting, with the one relay wireless device, the output signal to a destination device.
A wireless apparatus comprising:
- a) a receiver configured to receive a transmission of data from a source wireless device;
- b) a converter configured to split the received transmission into K streams;
- c) channel encoders configured to encode each of the K streams;
- d) a multiple-input-multiple-output (MIMO) encoder configured to apply multiple-input-multiple-output (MIMO) encoding to the K encoded streams to generate K parallel streams;
- e) a randomizing processor configured to independently generate a random vector of length K;
- f) a combiner configured to linearly combine the K parallel streams using the random vector to obtain an output signal;
- and
- g) a transmitter configured to transmit the output signal to a destination device.
Dependencies are inferred from the claim text.