Methods and devices for channel estimation
A method for channel estimation, performed by a wireless transmit/receive unit (WTRU), includes: receiving a plurality of input signals, generating a plurality of sensing matrices for the input signals, generating an augmented sensing matrix and an augmented observation vector according to the sensing matrices and the input signals, estimating a plurality of channel delay parameters according to the augmented sensing matrix and the augmented observation vector, and estimating channel information according to the channel delay parameters.
1. A wireless transmit/receive unit (WTRU) comprising:
a receiver configured to receive a plurality of input signals;
a processor coupled to the receiver and configured to:
generate a plurality of sensing matrices for the input signals;
concatenate the sensing matrices to generate an augmented sensing matrix;
generate an augmented observation vector according to the input signals;
estimate a plurality of channel delay parameters according to the augmented sensing matrix and the augmented observation vector; and
estimate channel information according to the channel delay parameters.
2. The WTRU according to claim 1 , wherein the input signals include a plurality of pilot signals.
3. The WTRU according to claim 2 , wherein the processor is further configured to:
transform the input signals into a plurality of frequency domain signals;
extract a plurality of observation vectors from the frequency domain signals according to positions of the pilot signals; and
concatenate the observation vectors to generate the augmented observation vector.
4. The WTRU according to claim 1 , wherein the processor is further configured to:
perform a Compressive Sensing (CS) algorithm using the augmented sensing matrix and the augmented observation vector to estimate the channel delay parameters.
5. The WTRU according to claim 1 , wherein the processor is further configured to:
perform a Least-Squares (LS) algorithm using the channel delay parameters to estimate the channel information.
6. A method for channel estimation, performed by a wireless transmit/receive unit (WTRU), comprising:
receiving a plurality of input signals;
generating a plurality of sensing matrices for the input signals;
concatenating the sensing matrices to generate an augmented sensing matrix;
generating an augmented observation vector according to the input signals;
estimating a plurality of channel delay parameters according to the augmented sensing matrix and the augmented observation vector; and
estimating channel information according to the channel delay parameters.
7. The method according to claim 6 , wherein the input signals include a plurality of pilot signals.
8. The method according to claim 7 , further comprising:
transforming the input signals into a plurality of frequency domain signals;
extracting a plurality of observation vectors from the frequency domain signals according to positions of the pilot signals; and
concatenating the observation vectors to generate the augmented observation vector.
9. The method according to claim 6 , further comprising:
performing a Compressive Sensing (CS) algorithm using the augmented sensing matrix and
the augmented observation vector to estimate the channel delay parameters.
10. The method according to claim 6 , further comprising:
performing a Least-Squares (LS) algorithm using the channel delay parameters to estimate the channel information.