| 摘要 |
<p>The invention regards to a method and an apparatus in especially TDS-OFDM system, e.g. a system according to terrestrial broadcasting standard of Chinese digital television, for cyclic reconstruction in a frequency equalizer in system with pseudo random sequence (PN) and without cyclic prefix, wherein data consisting of linear convolution of sent data with channel-response are received, and wherein received data are transformed to a circle convolution of sent data and of channel-response. Especially, there are executed the steps of detecting a length of the channel-response by channel estimation, cancelling a distortion of linear convolution which remains in the received data, compensating an information of circle convolution which leaks out of the received data, and generating a starting position of cyclic reconstruction. Especially, such method can be executed independent to any format of pseudo random sequence by executing these four main functions.</p> |
