Transmission apparatus and method for use in mobile communication system based on orthogonal frequency division multiplexing scheme

A method for transmitting information bit sequences from a BS (Base Station) transmitter to a plurality of users, comprising the steps of:

• a) dividing each of the information bits received in sub-channel units into a plurality of information bit sequences in response to respective users;
• b) dividing a single frame of information bit sequences to be transmitted to individual users into a plurality of times according to a given time interval, dividing the information bit sequences within the plurality of division times, spreading the divided information bit sequences using different orthogonal codes, combining the spread information bit sequences into a single sequence associated with the individual users, and outputting the single sequence;
• c) dividing the single sequence, distributing the spread information bit sequences over a plurality of bandwidths capable of mapping-processing the spread information bit sequences with sub-carrier frequencies;
• d) frequency hopping for performing a frequency hopping function such that each of the bandwidths does not overlap with time-frequency cells given by the given time interval;
• and
• e) IFT(Inverse Fourier Transform)-processing the spread information bit sequences, and generating the IFT-processed result.

A transmission apparatus for use in a mobile communication system capable of transmitting information bit sequences from a BS (Base Station) transmitter to a plurality of users, comprising:

• a plurality of traffic channel transmitters for dividing a modulation data symbol sequence corresponding to a predetermined user into division modulation data symbol sequences, the number of which is equal to the number of sub-channels assigned to the predetermined user, spreading the respective division modulation data symbol sequences using different channelization codes, and performing a mapping-process with sub-carriers comprising a corresponding sub-channel;
• a TDM (Time Division Multiplexer) for receiving a first input signal from the traffic channel transmitters, the first input signal including traffic channel signals from the traffic channel transmitters, a pilot channel signal, and sync (synchronous) and shred channel signals, which have been spread by a predetermined channelization code and have been modulated by a predetermined modulation scheme, and receiving a preamble channel signal as a second input signal, such that the first input signal and the second input signal are selected in time-domain units of the sub-channel;
• and
• an IFT (Inverse Fourier Transform) unit for IFT-processing a signal selected by the TDM, and generating the IFT-processed result.

A transmission method for use in a mobile communication system capable of transmitting information bit sequences from a BS (Base Station) transmitter to a plurality of users, comprising the steps of:

• a) dividing a modulation data symbol sequence corresponding to a predetermined user into division modulation data symbol sequences, the number of which is equal to the number of sub-channels assigned to the predetermined user, spreading the respective division modulation data symbol sequences using different channelization codes, and performing a mapping-process in association with sub-carriers comprising a corresponding sub-channel;
• b) multiplexing a first input signal and a second input signal such that the first input signal and the second input signal are selected in time-domain units of the sub-channel, wherein the first input signal includes traffic channel signals, a pilot channel signal, and sync (synchronous) and shared channel signals, which have been spread by a predetermined channelization code and have been modulated by a predetermined modulation scheme, and a preamble channel signal is the second input signal,;
• and
• c) IFT (Inverse Fourier Transform)—processing a signal selected at step (b), and generating the IFT-processed result.

A method for transmitting data in a communication system, comprising the steps of:

• dividing a frequency band into a plurality of sub-bands;
• selecting a user to use a sub-band among the plurality of sub-bands;
• allocating a channel which belongs to the selected sub-band to the user;
• controlling an operation of hopping of the allocated channel during a predetermined Orthogoal Frequency Division Multiplexing (OFDM) symbol time interval;
• dividing information bits input by a unit of the sub-channel corresponding to each of users into a plurality of information bit streams;
• spreading each of the plurality of information bit streams by multiplying the each of the plurality of information bit streams with different channelization codes;
• generating a spread information bit stream by adding the plurality of spread information bit streams;
• scrambling the spread information bit stream by multiplying the spread information bit stream with a predetermined scrambling code;
• and
• dividing the scrambled information bit stream into a plurality of scrambled information bit streams,
• wherein the hopping is preformed in the sub-band.