The invention relates to a time-frequency coding diversity MT-CDMA (multiple tone-
code division multiple access)
system transmitting and receiving method and belongs to a
broadband multicarrier
wireless communication transmitting and receiving method. A two-dimensional dispreading and multi-path separation module utilizes a time-frequency two-dimensional
spread spectrum code group matrix, the two-dimensional dispreading and multi-path separation of users is realized, multiple paths of mutually irrelevant
fading signals are obtained, each path of signals is merged by a
phase correction and merging technology, and final output results are obtained through judgment; the
spread spectrum code length can be any integral multiple of the
subcarrier number, each user carries out two-dimensional coding according to a time-frequency coding grid chart, the
duration time of a basic frame is enabled to be constant, and the
data rate of a single user of a
system is not reduced; and multiple multicarrier symbols are used as the basic frame during the
system processing, and the basic frame is respectively used as a basic unit of
processing time at
transmitter and
receiver ends. The transmitting and receiving method has the advantages that the method maintains the compatibility of the existing MT-CDMA system on the basis of a time-frequency coding diversity MT-CDMA
wireless communication system of a
RAKE receiver, and the system modification can be conveniently completed.