This invention provides a diversity receiver, which has N branches for receiving M versions of an input signal. The diversity receiver comprises N channel state information estimators, a demodulator and a combining and demapping device. After receiving the M versions of the input signal, the demodulator performs demodulation and then generates M demodulated signals. N channel state information estimators, one channel state information estimator equipped for each branch, respectively fetches the signals from the demodulator to generate M channel parameters related to the M versions of the input signal. The combining and demapping device receives the M demodulated signals, performs signal combining operations and symbol demapping, and finally generate a pre-correcting signal.