Sectored random beams for compressive channel estimation in massive MIMO
A method for compressive channel estimation in a massive multiple input, multiple output (MIMO) system using sectored random beams is provided. In an embodiment, a method in a massive multiple input, multiple output (MIMO) transceiver for channel estimation includes obtaining a sector. The sector includes less than a complete coverage area of the transceiver. The method also includes transmitting, by the transceiver, a plurality of random beams to a user equipment (UE) in the sector.
1. A method in a massive multiple input, multiple output (MIMO) transceiver for channel estimation, the method comprising:
obtaining a sector of sectors, the sector comprising less than a complete coverage area of the transceiver; and
transmitting, by the transceiver, a plurality of random beams to a user equipment (UE) in the sector, wherein the plurality of random beams are generated by spatial filtering of a random beam pattern.
2. The method of claim 1 , wherein the random beams are generated according to spatial filter coefficients.
3. The method of claim 1 , wherein a first one of the random beams is used on a first pilot subcarrier and a second one of the random beams is used on a second pilot subcarrier, wherein the first pilot subcarrier is different from the second pilot subcarrier.
4. The method of claim 1 , wherein the random beams are aggregated together in one orthogonal frequency-division multiplexing (OFDM) symbol.
5. The method of claim 1 , wherein the random beams occupy only a portion of the spatial spectrum.
6. The method of claim 1 , wherein the sectors are formed based on frequency division duplex (FDD) reciprocity.
7. The method of claim 1 , wherein the sectors are determined according to an uplink sounding signal from the UE.
8. The method of claim 1 , wherein the sectors are determined according to out-of-band information.
9. A transceiver in a massive multiple input, multiple output (MIMO) system configured for channel estimation comprising:
a processor configured to obtain a sector of sectors, the sector comprising less than a complete coverage area of the transceiver; and
a transmitter configured to:
transmit a plurality of random beams to a user equipment (UE) in the sector, wherein the plurality of random beams are generated by spatial filtering of a random beam pattern.
10. The transceiver of claim 9 , wherein the random beams are generated according to spatial filter coefficients.
11. The transceiver of claim 9 , wherein a first one of the random beams is used on a first pilot subcarrier and a second one of the random beams is used on a second pilot subcarrier, wherein the first pilot subcarrier is different from the second pilot subcarrier.
12. The transceiver of claim 9 , wherein the random beams are aggregated together in one orthogonal frequency-division multiplexing (OFDM) symbol.
13. The transceiver of claim 12 , wherein the random beams occupy only a portion of the spatial spectrum.
14. The transceiver of claim 9 , wherein the sectors are formed based on frequency division duplex (FDD) reciprocity.
15. The transceiver of claim 9 , wherein the sectors are determined according to an uplink sounding signal from the UE.
16. The transceiver of claim 9 , wherein the sectors are determined according to out-of-band information.
17. A network component comprising:
a memory storage comprising instructions; and
one or more processors in communication with the memory storage, wherein the one or more processors execute the instructions to:
obtain a sector of sectors, the sector comprising less than a complete coverage area of a transceiver; and
transmit a plurality of random beams to a user equipment (UE) in the sector, wherein the plurality of random beams are generated by spatial filtering of a random beam pattern.