Unified closed loop SU/MU-MIMO signaling and codebook design
First Claim
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1. A method comprising:
- at a base station supporting both multi-user multiple input multiple output (MU-MIMO) and single user multiple input multiple output (SU-MIMO) using a multi-resolution codebook comprising a first codebook and a second codebook, receiving first channel feedback from a first wireless device implementing said MU-MIMO, said first channel feedback describing a downlink channel from said base station to said first wireless device, wherein said first channel feedback is quantized using said first codebook;
pre-coding first data for transmission to said first wireless device, using said first channel feedback;
receiving second channel feedback at said base station from a second wireless device implementing said SU-MIMO, said second channel feedback describing a downlink channel from said base station to said second wireless device, wherein said second channel feedback is quantized using said second codebook, and said second codebook is smaller than, and a subset of, said first codebook; and
pre-coding second data for transmission to said second wireless device, using said second channel feedback.
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Abstract
A multi-resolution codebook is used to provide quantization for channel related information in a wireless network that supports both single-user MIMO and multi-user MIMO. The multi-resolution codebook may include a higher resolution “fine” codebook for use with MU-MIMO subscriber stations and a lower resolution “coarse” codebook for use with SU-MIMO subscriber stations. A tracking codebook may also be used to provide quantization for updates to channel related information. In at least one embodiment, the tracking codebook includes a number of unit vectors (or orthogonal matrices) disposed upon a sphere cap.
14 Citations
15 Claims
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1. A method comprising:
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at a base station supporting both multi-user multiple input multiple output (MU-MIMO) and single user multiple input multiple output (SU-MIMO) using a multi-resolution codebook comprising a first codebook and a second codebook, receiving first channel feedback from a first wireless device implementing said MU-MIMO, said first channel feedback describing a downlink channel from said base station to said first wireless device, wherein said first channel feedback is quantized using said first codebook; pre-coding first data for transmission to said first wireless device, using said first channel feedback; receiving second channel feedback at said base station from a second wireless device implementing said SU-MIMO, said second channel feedback describing a downlink channel from said base station to said second wireless device, wherein said second channel feedback is quantized using said second codebook, and said second codebook is smaller than, and a subset of, said first codebook; and pre-coding second data for transmission to said second wireless device, using said second channel feedback. - View Dependent Claims (2, 3, 4, 5)
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6. An article comprising a non-transitory computer readable storage medium having instructions stored thereon that, when executed by a processor, operate to:
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at a base station supporting both multi-user multiple input multiple output (MU-MIMO) and single user multiple input multiple output (SU-MIMO) using a multi-resolution codebook comprising a first codebook and a second codebook, receive first channel feedback from a first wireless device implementing said MU-MIMO, said first channel feedback describing a downlink channel from said base station to said first wireless device, wherein said first channel feedback is quantized using a first codebook; pre-code first data for transmission to said first wireless device using said first channel feedback; receive second channel feedback at said base station from a second wireless device implementing said SU-MIMO, said second channel feedback describing a downlink channel from said base station to said second wireless device, wherein said second channel feedback is quantized using said second codebook, and said second codebook is smaller than, and a subset of, said first codebook; and pre-code second data for transmission to said second wireless device using said second channel feedback. - View Dependent Claims (7, 8, 9, 10)
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11. An apparatus comprising:
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a wireless transceiver to receive signals from a multiple input multiple output (MIMO) channel and to transmit signals into said MIMO channel; and a controller supporting both multi-user MIMO (MU-MIMO) and single user MIMO (SU-MIMO) using a multi-resolution codebook comprising a first codebook and a second codebook, configured to; receive via said wireless transceiver, first channel feedback from a first wireless device implementing said MU-MIMO, said first channel feedback describing a downlink channel from a base station to said first wireless device, wherein said first channel feedback is quantized using said first codebook; pre-code first data for transmission to said first wireless device via said wireless transceiver, using said first channel feedback; receive, via said wireless transceiver, second channel feedback from a second wireless device implementing said SU-MIMO, said second channel feedback describing a downlink channel from said base station to said second wireless device, wherein said second channel feedback is quantized using said second codebook that is smaller than, and a subset of, said first codebook; and pre-code second data for transmission to said second wireless device via said wireless transceiver, using said second channel feedback. - View Dependent Claims (12, 13, 14, 15)
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Specification