Equalizer for radio receive signal

Details Equalizer for radio receive signal Equalizer for radio receive signal

H - Electricity

04

B

H04B 1/16 (2006.01) H04B 7/005 (2006.01) H04L 25/03 (2006.01)

Patent

CA 2046399

In a transversal type equalizer having a series connected delay elements, multipliers coupled with each output of each delay element and an adder for adding outputs of said multipliers to provide an equalized output signal for equalizing time division radio receive signal for every burst in mobile communication, a receive memory (11) for storing receive signal, a transversal type equalization process circuit (77a) coupled with output of said memory (11), and an output memory (100) for storing equalized output signal are provided. In training tap coefficients of a transversal filter, a tap or a delay element is precluded when an absolute value of a tap coefficient is less than a predetermined value, so that calculation amount for updating tap coefficients is decreased and tracking characteristics are improved; a multiplier (15) is inserted between an output of said receive memory (11) and an input of said equalization process circuit (77a) so that a signal which is subject to equalization is phase-shifted beforehand so that frequency offset between transmit frequency in a transmitter and local frequency in a receiver is compensated. The phase adjustment by said multiplier (15) depends upon residual phase error at output of said equalization process circuit (77a); an output memory (100) is used as a training signal to initialize the tap coefficients of said equalization process circuit (77a) during a burst when equalized output signal has error larger than a predetermined value.

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