Predistortion arrangement for a digital transmission system

Details Predistortion arrangement for a digital transmission system Predistortion arrangement for a digital transmission system

H - Electricity

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H04B 15/00 (2006.01) H03F 1/32 (2006.01) H04B 1/62 (2006.01) H04B 7/15 (2006.01) H04L 27/36 (2006.01)

Patent

CA 2026820

PHF 89.594 12/09/1990 ABSTRACT Predistortion arrangement for a digital transmission system. Predistortion arrangement (9) for a digital transmission system which transmits complex input data of a constellation by means of a modulator (14) and a power amplifier (15) which distorts the data, the arrangement comprising a predistortion circuit (11) which predistorts the input data in opposite sense before they pass through the amplifier. It comprises a transmit filter (10) which applies oversampled filtered data encoded with 2N bits to the predistortion circuit (11) at the rate k/T, which circuit comprises an encoder (20) transforming the filtered 2N-bit encoded data into data encoded with 2M bits (M < N) which address a memory (51) that stores complex predistortion coefficients, and which circuit includes a complex multiplier (52) that multiplies for each data element the 2N bits of the filtered data element by the selected predistortion coefficient for producing predistorted data. Reference: Fig. 5.

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