Method and apparatus for switching operating modes of a receiver

1. A method for switching operating modes of a receiver receiving data, the method comprising:

determining whether a criteria is met to switch the operating mode of the receiver, wherein the criteria for switching the operating mode of the receiver is selected from the group consisting of: a signal to noise ratio (SIR) input, a transport format resource combination (TFRC) input, a delay spread estimate and a power save input;

switching the operating mode of the receiver from a first mode to a second mode if the criteria is met;

performing a channel estimation on the received data using M number of taps; and

performing equalization on the received data using a tap update of L number of taps;

wherein the first and second operating modes are selected from the group consisting of an equalizer mode and a matched filter (MF) mode;

wherein the first mode is the equalizer mode and the second mode is the MF mode;

wherein the receiver is operating in the second mode, further comprising:

stopping the equalization of the received data;

enlarging the M number of taps, wherein the enlargement of the number of M taps is dynamic; and

reassigning equalization resources to channel estimation resources.

2. The method of claim 1 wherein switching the operating mode of the receiver from the first mode to a second mode if the criteria is met is performed if the delay spread estimation indicates that the transmission channel consists of a single path.

3. The method of claim 1 wherein switching the operating mode of the receiver from the first mode to a second mode if the criteria is met is performed if the battery power is lower than a pre-defined value.

4. The method of claim 1 wherein the enlargement of the number of M taps is permanent.

5. The method of claim 1 , further comprising setting a number N of tapped delay line (TDL) taps based upon the operating mode of the receiver.

6. The method of claim 5 wherein the number N is set to the L number of taps when the receiver is operating in the equalizer mode.

7. The method of claim 5 wherein the number N is set to the M number of taps when the receiver is operating in the MF mode.

8. The method of claim 1 , further comprising:

weighting the output of the receiver.

9. A receiver comprising:

a channel estimation block a window length of M taps;

a complex conjugation block configured to generate a matched filter (MF) output;

an equalization block including a window of L taps and configured to generate an equalized signal;

a selection block configured to determine whether a criteria is met to switch from a first operating mode of the receiver to a second operating mode and wherein the selection block is configured to receive a signal to noise ratio (SIR) input, a transport format resource combination (TFRC) input, a delay spread estimate and a power save input; and

a switch, configured to receive the equalized signal from equalization block, the MF output from the complex conjugation block, and an input from the selection block, wherein the switch is configured to output either the equalized signal or the MF output based upon the input from the selection block.

10. The receiver of claim 9 wherein the selection block is further configured to signal to the switch to switch from the first mode of operation to the second mode of operation.

11. The receiver of claim 9 wherein the first mode of operation is an equalization mode and the second mode of operation is a matched filter (MF) mode.