Long term evolution (LTE) uplink canonical channel estimation

摘要

A method and system for canonical channel estimation in the Long Term Evolution uplink where a multi-frequency signal is generated and then converted to frequency spectrum which is then convolved in the frequency domain with a truncated window function to obtain a time domain channel impulse response. The time domain channel impulse response can be then transformed to a frequency domain to produce a down sampled user channel response, which can be then linearly interpolated to provide a channel estimate for a plurality of subcarriers. Such an approach achieves channel estimation within Long Term Evolution at only canonical locations to reduce complexity without loss in channel entropy.

主权项

1. A method for canonical channel estimation in a receiver of a wireless network utilizing a digital signal processor, said method comprising:
utilizing the digital signal processor to match a sequence to transmitted pilot symbols to produce a frequency spectrum, Y(ω)=X(ω)*P*(ω), wherein X is the obtained signal in a frequency domain and P is a generated Zadoff-Chu signal matched to pilot symbol; obtaining a down sampled time-domain channel impulse response (CIR) per user, YUserDS(ω), by convolving said frequency spectrum, Y(ω), with a truncated windowing function, WUser(ω), in the frequency domain utilizing equation YUserDS(ω)=Y(ω)*WUser(ω); performing phase correction in the frequency domain on said CIR, YUserDS(ω), utilizing Y′UserDS(ω)·exp(j(0:N)2πδ∫User), wherein δ∫User is a user dependent phase shift and N is the number of subcarriers; linearly interpolating said phase corrected CIR, YUserDS(ω), to produce channel estimates at all subcarrier locations, [YUser(ω4k-0) . . . YUser(ω4k-3)].