Method and system for performing channel estimation in a multiple antenna block transmission system
View Patent ↗Methods and systems for performing channel estimation in a multiple antenna block transmission system are provided so as to improve the channel estimation quality and/or the delay spread of the channels that can be estimated.
1. A method for performing channel estimation of each transmit antenna-receive antenna pair in a block transmission system, the method comprising the steps of:
a. determining a delay profile of each transmit antenna-receive antenna pair;
b. calculating at least one weighted averaged delay profile, wherein the step of calculating a weighted averaged delay profile comprises performing a spatial weighted averaging of the delay profiles of a plurality of transmit antenna-receive antenna pairs, and wherein spatial weighting corresponding to each transmit antenna-receive antenna pair is determined based on the pilot density of the corresponding transmit antenna; and
c. estimating a channel response of each transmit antenna-receive antenna pair based on the at least one weighted averaged delay profile.
2. The method of claim 1 , wherein the delay profile is a power delay profile.
3. The method of claim 1 , wherein the delay profile is a channel impulse response (CIR) auto-correlation matrix.
4. The method of claim 1 , wherein a weighted averaged delay profile is calculated corresponding to each transmit antenna-receive antenna pair.
5. The method of claim 4 , wherein the channel response of each transmit antenna-receive antenna pair is estimated based on corresponding weighted averaged delay profile.
6. The method of claim 1 , wherein a weighted averaged delay profile is calculated corresponding to a plurality of transmit antenna-receive antenna pairs.
7. The method of claim 1 , wherein spatial weights corresponding to a transmit antenna-receive antenna pair is a function of the tap locations.
8. The method of claim 1 , wherein spatial weighting corresponding to a transmit antenna-receive antenna pair is determined based on the pilot boosting of the corresponding transmit antenna.
9. The method of claim 1 , wherein spatial weighting corresponding to a transmit antenna-receive antenna pair is determined based on the interference on the pilot locations of the signal transmitted by the corresponding transmit antenna.
10. The method of claim 1 , wherein the step of calculating the weighted averaged delay profile further comprises performing a weighted averaging across a plurality of symbols in time.
11. A system for performing channel estimation of each transmit antenna-receive antenna pair in a block transmission system, the system comprising:
a. a delay-profile-determining module, the delay-profile-determining module determining a delay profile of each transmit antenna-receive antenna pair;
b. a weighted averaging module, the weighted averaging module, calculating at least one weighted averaged delay profile, wherein the weighted averaging module, comprises a spatial averaging module, the spatial averaging module performing a spatial weighted averaging the delay profiles of a plurality of transmit antenna-receive antenna pairs, and wherein spatial weighted averaging corresponding to each transmit antenna-receive antenna pair is determined based on the pilot density of the corresponding transmit antenna; and
c. a channel response estimator, the channel response estimator estimating a channel response of each transmit antenna-receive antenna pair based on the at least one weighted averaged delay profile.
12. The system of claim 11 , wherein the weighted averaging module, further comprises a time averaging module, the time averaging module performing a weighted averaging across a plurality of symbols in time.