Patent ID: 8731093

Claim:
A communication system with a data-dependent superimposed training mechanism, comprising: a transmitter, comprising: a modulation module, arranged for receiving two-bit data to produce modulation data; and a precoding module, arranged for receiving the modulation data, and precoding the modulation data by a precoding matrix to produce precoding data, and the transmitter adding the precoding data to a data-dependent superimposed training sequence to produce superimposition data, and the superimposition data being added to a cyclic prefix to produce transmission data; and a receiver, arranged for receiving the transmitted data, and removing the cyclic prefix, and then executing a discrete Fourier transform to perform a channel estimation, and then performing a frequency domain equalization and an inverse discrete Fourier transform before performing a demodulation process, so as to restore the transmitted data; wherein, the precoding matrix is an N×N unitary matrix comprised of a Q×Q precoding sub-matrix, and Q is equal to a block size N divided by a channel length, and the precoding matrix distributes the modulation data uniformly on the frequency domain, and any two sets of data precoded by the precoding matrix must be different from each other, such that the receiver can identify the transmitted data and reduce a computational complexity of the receiver effectively; wherein the precoding sub-matrix is comprised of a discrete Fourier transform matrix and a diagonal matrix having a perfect sequence of diagonal elements; wherein the perfect sequence has the same gain of frequency domain and time domain.