Code transmitting method and system in orthogonal frequency division multiple access system

The invention provides a code transmitting method and system in an orthogonal frequency division multiple access system. The code transmitting method comprises the following steps that joint coding is conducted on system data bits needing to be sent in M transmission time intervals so that channel coding blocks can be obtained; the channel coding blocks are sent through the M TTIs, wherein the number of redundancy versions of the channel coding blocks is at least two, and M is an integer which is larger than 1.