Abstract: A channel estimation method for use with a received signal by a receiver is disclosed. The received signal comprises multiple data bursts which are transmitted to the receiver via multiple path channels, with each of the data bursts having a plurality of preamble symbols which are decoded. The channel estimation method includes the following steps: firstly, at least one correlation pattern is generated according to the decoded preamble symbols. Then, a cross correlation of the correlation pattern with the received signal is performed to yield at least one correlation result of channel impulse response (CIR). Wherein, the symbol boundary of the received signal is decided according to the correlation result.

Abstract: An Inter-Symbol Interference (ISI) removing method for a received signal executed by a receiver in an Orthogonal frequency division multiplexing (OFDM) system to estimate a frequency-domain data signal carried on the received signal is provided. The method comprises the steps of: removing the first interference of known signal of the received signal; estimating a first data signal according to the received signal; performing a hard decision operation on the first data signal to generate a first frequency-domain signal; performing an Inverse Fast Fourier Transform operation on the first frequency-domain signal to generate a first time-domain signal; creating a tailing signal according to the first time-domain signal; removing a preamble signal from the received signal to generate a second signal; combining the first time-domain signal and the second signal to estimate the frequency-domain data signal.

Abstract: An ISI removing method for a received signal executed by a receiver in an OFDM system to estimate a frequency-domain data signal carried on the received signal is provided. The method comprises the steps of: removing the first interference of known signal of the received signal; estimating a first data signal according to the received signal; performing a hard decision operation on the first data signal to generate a first frequency-domain signal; performing an Inverse Fast Fourier Transform operation on the first frequency-domain signal to generate a first time-domain signal; creating a tailing signal according to the first time-domain signal; removing a preamble signal from the received signal to generate a second signal; combining the first time-domain signal and the second signal to estimate the frequency-domain data signal.

Abstract: A channel estimation method for use with a received signal by a receiver is disclosed. The received signal comprises multiple data bursts which are transmitted to the receiver via multiple path channels, with each of the data bursts having a plurality of preamble symbols which are decoded. The channel estimation method includes the following steps: firstly, at least one correlation pattern is generated according to the decoded preamble symbols. Then, a cross correlation of the correlation pattern with the received signal is performed to yield at least one correlation result of channel impulse response (CIR). Wherein, the symbol boundary of the received signal is decided according to the correlation result.

Abstract: A method for co-channel interference suppression in Orthogonal Frequency Division Multiplexing (OFDM) systems with multiple receiving antennas is provided, wherein the co-channel interference (CCI) in different directions is suppressed by the spatial technique provided by the antenna arrays, and the interference to a desired carrier caused by other sub-carriers is also taken into consideration, that is, the interference of other sub-carriers is cancelled by means of a multistage interference cancellation, thereby the performance for interference suppression is improved.