Abstract:-This paper focuses on comb-type or scattered pilot arrangement in OFDM systems with a frequency guard band under the time-variant channel. If the maximum channel delay is large, there is a nearly singular matrix problem when a receiver adopts the Frequency Domain LS (FDLS) method to estimate the data subcarrier channel frequency response. This problem renders FDLS channel estimation more sensitive to noise. M. Yu and P. Sadeghi proposed a simply method to avoid the nearly singular matrix problem; however, th… Show more
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