APPARATUS FOR TRANSMITTING AND RECEIVING MESSAGES OF DIFFERENT FRAME LENGTHS VIA INTERMIXING

摘要

PURPOSE: An apparatus is provided to transmit and receive frame messages having different frame lengths from each other, and to intermix frame messages having different frame lengths from each other to transmit the intermixed result. CONSTITUTION: A message buffer(511) stores a frame message communicated when communicating a frame message via a dedicated channel. A modem controller(513) reads the frame message stored in the message buffer(511), parses a message type from a header of the read message, outputs data of a frame to be transmitted via the dedicated channel according to a message type of the parsed frame, and outputs a frame select signal according to the message type of the parsed frame. The first message generator(550) includes a cyclic redundancy check(CRC) generator(515), a tail bit generator(517), a coder(519), and an interleaver(521), and receives the first frame data from the modem controller(513) to generate the first frame message. The second message generator(560) includes a CRC generator(516), a tail bit generator(518), a coder(520), and an interleaver(522), and receives the second frame data from the modem controller(513) to generate the second frame message. A multiplexer(523) receives outputs of the first and second interleavers(521, 522) and selects any one of the received inputs in response to the frame select signal(SCTL) from the modem controller. A signal converting part(522) converts the frame message from the multiplexer to output the converted values to the first channel and the second channel. Gain controllers(527, 528) receive signals from the control bit inserting part(531) to control a gain of received signals in response to a gain control signal(GCTL) from the controller(513). An orthogonal code modulator(533) generates an orthogonal code in response to orthogonal code number and length of an assigned channel. An extension modulator(535) mixes the orthogonal modulated signal with an extension sequence.