DATA TRANSMISSION METHOD, TRANSMITTER, AND RECEIVER

摘要

The invention relates to a receiver and a data transmission method in a system wherein the CDMA multiple access method is utilized and wherein each data signal (30) to be transmitted is multiplied by a pseudorandom code (40) of a certain length, having a bit rate that is higher than that of the data signal to be transmitted. In order to ensure fast and inexpensive reception, the signal multiplied by the pseudorandom code is further modulated in the method according to the invention by a group of waveforms (f1 .. fN) the number of which equals the number of bits in the pseudorandom code, the frequency of each waveform being included in the frequency domain given. According to the method, the signal is converted in the receiver into a digital form and multiplied by the pseudorandom code which has been subjected to an inverse Fourier transform, and the multiplied signal is subjected to a Fourier transform.