Power control for partial channel-state information (CSI) multiple-input, multiple-output (MIMO) systems
First Claim
1. A method for controlling transmit power for a plurality of data streams in a wireless multi-channel communication system, comprising:
- processing a plurality of received symbol streams in accordance with a particular receiver processing technique to provide a plurality of detected data streams;
estimating signal-to-noise-and-interference ratios (SNRs) of the plurality of detected data streams;
identifying each SNR that exceeds a setpoint; and
determining an adjusted transmit power for each detected data stream associated with an SNR exceeding the setpoint;
wherein the received symbol streams are processed in accordance with a successive interference cancellation receiver processing technique;
determining a list of detection orders to be evaluated;
evaluating each detection order in the list by processing the plurality of received symbol streams in accordance with the successive interference cancellation receiver processing technique and based on the detection order to provide a plurality of detected data streams, estimating the SNRs of the plurality of detected data streams, deriving adjusted SNRs for the plurality of detected data streams by adjusting each SNR that exceeds the setpoint to be equal to the setpoint, and determining spectral efficiency for the detected data streams based on the adjusted SNRs, and wherein the adjusted transmit powers for the detected data streams are determined for a particular detection order selected based on the spectral efficiencies determined for the detection orders in the list.
1 Assignment
0 Petitions
Accused Products
Abstract
Techniques for controlling the transmit power for a number of data streams in a wireless multi-channel (e.g., MIMO) communication system. In one method, a number of received symbol streams are initially processed in accordance with a particular (e.g., CCMI, CCMI-SC, MMSE, or MMSE-SC) receiver processing technique to provide a number of detected data streams. The post-detection SNRs of the detected data streams are estimated, and each SNR that exceeds a setpoint is identified. This setpoint may correspond to (1) the SNR needed to achieve the maximum allowed spectral efficiency or (2) the target SNR needed to achieve a specified spectral efficiency. A new (or adjusted) transmit power for each detected data stream associated with a post-detection SNR that exceeds the setpoint is determined and used for the data stream. Different power control schemes are provided for different classes of receiver processing techniques with different characteristics.
84 Citations
27 Claims
-
1. A method for controlling transmit power for a plurality of data streams in a wireless multi-channel communication system, comprising:
-
processing a plurality of received symbol streams in accordance with a particular receiver processing technique to provide a plurality of detected data streams;
estimating signal-to-noise-and-interference ratios (SNRs) of the plurality of detected data streams;
identifying each SNR that exceeds a setpoint; and
determining an adjusted transmit power for each detected data stream associated with an SNR exceeding the setpoint;
wherein the received symbol streams are processed in accordance with a successive interference cancellation receiver processing technique;
determining a list of detection orders to be evaluated;
evaluating each detection order in the list by processing the plurality of received symbol streams in accordance with the successive interference cancellation receiver processing technique and based on the detection order to provide a plurality of detected data streams, estimating the SNRs of the plurality of detected data streams, deriving adjusted SNRs for the plurality of detected data streams by adjusting each SNR that exceeds the setpoint to be equal to the setpoint, and determining spectral efficiency for the detected data streams based on the adjusted SNRs, and wherein the adjusted transmit powers for the detected data streams are determined for a particular detection order selected based on the spectral efficiencies determined for the detection orders in the list. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
-
20. A method for determining an amount of transmit power required to achieve a specified spectral efficiency in a wireless multi-channel communication system, comprising:
-
determining a first set of transmission channels selectable for use for data transmission;
estimating performance of each of transmission channel in the first set, wherein each transmission channel is associated with a particular spectral efficiency;
determining a second set of transmission channels to be used for data transmission, wherein the second set include a minimum number of transmission channels from the first set with an aggregate spectral efficiency that meets the specified spectral efficiency; and
determining transmit power for each of the transmission channels in the second set to reduce overall transmit power while achieving the specified spectral efficiency. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
-
Specification