Method and device for estimating transmitted signals in a...

H - Electricity – 04 – L

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H04L 27/01 (2006.01) H03H 21/00 (2006.01) H04B 7/005 (2006.01) H04L 25/03 (2006.01) H04L 7/04 (2006.01) H04L 25/02 (2006.01)

Patent

CA 2126604

In a digital signal transmission system, a receiver (14) receives a signal (R(T)), wherein the signal bandwidth of the system exceeds the system symbol rate. A correlation and sampling circuit (15) receives a baseband signal (y(T)), samples (21) the signal eight times (y(k/8)) per symbol time (TS), correlates (23), generates a channel estimate (~F) and down-samples the sampled signal (y(k/8) ) to form an observed signal (y (k/2)). This signal is filtered in a prefilter (26), whose output is sampled at symbol rate (27, TS/1) and the obtained signal (z(k)) is delivered to a channel equalizer (17) which performs a viterbi algorithm with non-quadratic metric calculation and generates estimated symbols (~D(k)). A channel estimation filter (31) receives a symbol sequence which contains alternate zero-value symbols (.OMEGA.) and the estimated symbols (~D(k)) and generates an estimated signal (~(k/2)). An error signal (e(k/2)=y(k/2)-~(k/2)) is generated and used to adapt (34) the channel estimate (~(k/2)) and also to generate (35) weight factors (.alpha.(k/2)). The coefficients (~(k/2)) of the prefilter (26) are generated as a function of the channel estimate (~(k/2)) and the weight factors (.alpha.(k/2)). Coefficients are generated in a metric calculation filter (39, ~(k)) by convoluting the channel estimate (~(k/2)) with the prefilter (~(k/2)) and are used to generate the estimated symbols (~D(k)). The transmisson channel, excluding the prefilter (26), is estimated explicitly so as to enable fast channel changes to be followed. The use of the weight factors (.alpha.(k/2)) enables a short channel estimate to be used. The insertion of the zero-value symbols (.OMEGA.) simplifies adaptation (34) of the channel estimate (~(k/2)).

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