Channel estimation by time multiplexed complementary sequences
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United States of America Patent
Stats
-
Dec 9, 2003
Grant Date -
Jul 5, 2001
app pub date -
Dec 28, 2000
filing date -
Dec 30, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of estimating qualities of a transmission or telecommunications channel involves using a pair of complementary sequences s(n) and g(n), with n=0, 1, . . . , N-1, which have the property that the sum of their auto-correlations is a perfect Dirac function (that is, .PHI..sub.s,s (n)+.PHI..sub.g,g (n)=k.multidot..delta.(n)). A composite signal made up of two complementary sequences s(n) and g(n) is used, after having time multiplexed these two sequences in such a way as to exploit the property .PHI..sub.s,s (n)=.PHI..sub.g,g (n)=k.multidot..delta.(n). The composite signal is made up of two sequences which are concatenated with, between them, a guard interval of a duration greater than or equal to the length of the impulse response of the channel to be estimated.
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