MIMO receiver having improved SIR estimation and corresponding method
First Claim
1. A method of operating a wireless receiver, the method comprising:
- receiving a plurality of data streams over a wireless multiple-input-multiple-output data channel, whereby each data stream is received at all of a plurality of receive antennas of the receiver from all of a plurality of transmit antennas of a transmitter with a respective weighting having been applied to each stream as transmitted from each different transmit antenna;
receiving a common pilot signal over a common pilot channel common to said receiver and one or more other receivers;
receiving an indication of said weightings;
extracting individual data streams from the plurality received at said receive antennas;
measuring an overall power received in each of the individual data streams;
using said weightings and the common pilot signal together with the measured overall power received in each of the extracted data streams to calculate, for each of said streams, an estimate of signal power relative to interference from the one or more others of said data streams, wherein said calculation comprises;
(i) for each extracted data stream, using a corresponding pilot stream from the common pilot channel to generate a respective estimate of an equivalent channel response for each of the plurality of receive antennas;
(ii) using the estimated channel responses and said weightings to calculate estimates of signal power, noise power, and interference power of the pilot streams; and
(iii) using the estimates of signal power, noise power, and interference from the pilot streams together with the measurements of received power in each extracted data stream to calculate the estimates of signal power, noise power, and interference power from the other data streams by estimating a per data stream power by;
calculating a signal power ratio {circumflex over (γ
)} between the pilot and the data streams, wherein;
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Accused Products
Abstract
A method and corresponding receiver product, the method including: receiving a plurality of data streams over a wireless multiple-input-multiple-output data channel, whereby each data stream is received at all of a plurality of receive antennas from all of a plurality of transmit antennas with a respective weighting having been applied to each stream as transmitted from each different transmit antenna; receiving a common pilot signal over a common pilot channel; receiving an indication of the weightings; extracting the individual data streams from the plurality received at the receive antennas; and using the weightings and the common pilot signal together with information regarding the extracted data streams to calculate, for each of the streams, an estimate of signal power relative to interference from the one or more others of the data streams.
8 Citations
26 Claims
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1. A method of operating a wireless receiver, the method comprising:
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receiving a plurality of data streams over a wireless multiple-input-multiple-output data channel, whereby each data stream is received at all of a plurality of receive antennas of the receiver from all of a plurality of transmit antennas of a transmitter with a respective weighting having been applied to each stream as transmitted from each different transmit antenna; receiving a common pilot signal over a common pilot channel common to said receiver and one or more other receivers; receiving an indication of said weightings; extracting individual data streams from the plurality received at said receive antennas; measuring an overall power received in each of the individual data streams; using said weightings and the common pilot signal together with the measured overall power received in each of the extracted data streams to calculate, for each of said streams, an estimate of signal power relative to interference from the one or more others of said data streams, wherein said calculation comprises; (i) for each extracted data stream, using a corresponding pilot stream from the common pilot channel to generate a respective estimate of an equivalent channel response for each of the plurality of receive antennas; (ii) using the estimated channel responses and said weightings to calculate estimates of signal power, noise power, and interference power of the pilot streams; and (iii) using the estimates of signal power, noise power, and interference from the pilot streams together with the measurements of received power in each extracted data stream to calculate the estimates of signal power, noise power, and interference power from the other data streams by estimating a per data stream power by; calculating a signal power ratio {circumflex over (γ
)} between the pilot and the data streams, wherein; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 26)
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13. A receiver comprising:
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a plurality of receive antenna for receiving a plurality of data streams over a wireless multiple-input-multiple-output data channel, whereby each data stream is received at all of said plurality of receive antennas from all of a plurality of transmit antennas of a transmitter with a respective weighting having been applied to each stream as transmitted from each different transmit antenna; and
for receiving a common pilot signal over a common pilot channel common to said receiver and one or more other receivers;wherein the receiver further comprises a processing means configured to; receive an indication of said weightings; extract individual data streams from the plurality received at said receive antennas; measure an overall power received in each of the individual data streams; use said weightings and the common pilot signal together with the measured overall power received for each of the extracted data streams to calculate, for each of said streams, an estimate of signal power relative to interference from the one or more others of said data streams, wherein said calculation comprises; (i) for each extracted data stream, using a corresponding pilot stream from the common pilot channel to generate a respective estimate of an equivalent channel response for each of the plurality of receive antennas; (ii) using the estimated channel responses and said weightings to calculate estimates of signal power, noise power, and interference power of the pilot streams; and (iii) using the estimates of signal power, noise power, and interference from the pilot streams together with the measurements of received power in each extracted data stream to calculate the estimates of signal power, noise power, and interference power from the other data streams by estimating a per data stream power by; calculating a signal power ratio {circumflex over (γ
)} between the pilot and the data streams, wherein; - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A user equipment comprising:
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a plurality of receive antenna for receiving a plurality of data streams over a wireless multiple-input-multiple-output data channel, whereby each data stream is received at all of said plurality of receive antennas from all of a plurality of transmit antennas of a transmitter with a respective weighting having been applied to each stream as transmitted from each different transmit antenna; and
for receiving a common pilot signal over a common pilot channel common to said receiver and one or more other receivers;wherein the receiver further comprises a processing means configured to; receive an indication of said weightings; extract individual data streams from the plurality received at said receive antennas; measure an overall power received in each of the individual data streams; use said weightings and the common pilot signal together with the measured overall power received for each of the extracted data streams to calculate, for each of said streams, an estimate of signal power relative to interference from the one or more others of said data streams, wherein said calculation comprises; (i) for each extracted data stream, using a corresponding pilot stream from the common pilot channel to generate a respective estimate of an equivalent channel response for each of the plurality of receive antennas; (ii) using the estimated channel responses and said weightings to calculate estimates of signal power, noise power, and interference power of the pilot streams; and (iii) using the estimates of signal power, noise power, and interference from the pilot streams together with the measurements of received power in each extracted data stream to calculate the estimates of signal power, noise power, and interference power from the other data streams by estimating a per data stream power by; calculating a signal power ratio {circumflex over (γ
)} between the pilot and the data streams;
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Specification