Patent ID: 7327776
Filing Date: 2008-02-05
Classification: H04B,H04L

Abstract:
1. A time domain spreading method for a ultra-wide band (UWB) receiver, the UWB receiver being adapted to receive a series of multi-band orthogonal-frequency-division-multiplexing (MB OFDM) symbol signals transmitted from a UWB transmitter, the UWB transmitter comprising a time domain spreading apparatus to exchange real part and imaginary part of a signal S(n)=P 1 (n)+jP Q (n) to obtain another signal R(n)=P Q (n)+jP 1 (n), wherein n is an integer, and the UWB receiver receives a series of symbol signals, the time domain spreading method for the UWB receiver comprising following steps: performing a fast Fourier transform (FFT) to obtain a series of transformed signals Y(m) according to one of the received signals, wherein the Y(m)=Y exchanging real part and imaginary part of the transformed signals, inversely outputting the exchanged signals to obtain a plurality of despreading received data signals X(m), wherein the X(m)=Y