Iterative LMMSE channel estimation for LTE/MIMO-OFDM


by florenti
Tags: woodbury identity
florenti
florenti is offline
#1
Apr7-12, 10:01 AM
P: 9
Hi,

I have the following problem regarding the iterative channel estimation employing LMMSE.

The channel estimation formula is:

H_lmmse,nt,nr,ns=Rhh*Xnt,ns'(sum(Xnt,ns*Rhh*Xnt,ns')+sigma^2)^-1*Ynr,ns.

Explonation:

Rhh - channel autocorrelation matrix of size KxK (K number of subcarriers)

Xnt,ns - diagonal matrix size Kx, kontaining in its diagonal: pilot symbols, data symbols and zero symbols. nt-Tx antenna index. ns - OFDM symbol index.

sigma-noise variance

sum - goes from 1 to Ntx(for the number of Tx antennas)

Ynr,ns - Rx signal. nr - Rx antenna index.

Is there any posibility to apply the WOODBURY identity to the H_lmmse,nt,nr,ns, and how can this be done?

Thanks in advance
Phys.Org News Partner Science news on Phys.org
Internet co-creator Cerf debunks 'myth' that US runs it
Astronomical forensics uncover planetary disks in Hubble archive
Solar-powered two-seat Sunseeker airplane has progress report

Register to reply

Related Discussions
spectrum estimation with noisy data, unbiased estimation of amplitudes needed Electrical Engineering 6
channel estimation i communication Electrical Engineering 0
Wiring a 6 channel audio with a 2 channel RCA Electrical Engineering 1
How to add additional channel for analog TV (Local Community Channel) General Engineering 1
UFO Hunters on The SciFi Channel and The History Channel Science Fiction & Fantasy 18