Transmitting and receiving method and radio system
AssigneeNokia Telecommunications Oy
InventorsHannu Häkkinen, Ari Hottinen, Mikko Kokkonen, Risto Wichman
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Abstract
The invention relates to a transmitting and receiving method and a radio system. In a transmitter the signals to be transmitted are spread coded in means and modulated by subcarriers in means. In a receiver (R) the signals are demodulated in means and submitted to multiuser detection in means by using the subcarriers to limit the number of detectable signals in the means. The receiver uses multiuser detection for reducing multiple access interference and correcting frequency-selective fading.
Claims20
A transmitting and receiving method used in a digital radio system comprising at least one base station and subscriber terminal communicating with one another by transmitting and receiving signals, wherein upon transmission spread-coding and modulating the signals by predetermined subcarriers in accordance with Orthogonal Frequency Divisional Multiple Access or Code Division Multiple Access (OFDMA/CDMA) methods, and upon reception demodulating and multiuser-detecting the signals by selecting the signals to be detected in the multiuser detection using the predetermined subcarriers and consequently reducing the number of signals in the multiuser detection.
A radio system comprising at least one base station and subscriber terminal with a transmitter and receiver arranged to transmit and receive digital signals wherein the transmitter comprises means for spread coding and means for modulating the transmission signals by predetermined subcarriers in accordance with Orthogonal Frequency Divisional Multiple Access or Code Division Multiple Access (OFDMA/CDMA) methods, and the receiver comprises demodulation means arranged to select a detectable signal on the basis of the predetermined subcarriers, and means for multiuser detection of the received signals.
Dependencies are inferred from the claim text.