A control channel of a communication method and an apparatus includes at least one timeslot, and the method includes: obtaining, according to a first data symbol sequence to be transmitted in a timeslot and coefficients a(i) and d(i), a second data symbol sequence and a third data symbol sequence, where, in a(i)+d(i), at least one pair of a(u)+d(u) and a(v)+d(v) have moduli unequal to each other; and using the same extension sequence [w(0), w(1), . . . , w(N−1)] to process the second data symbol sequence and the third data symbol sequence, mapping the processed data respectively onto the same time-frequency resources corresponding to a first antenna array and a second antenna array, and transmitting the data, where i, u, and v are integers, 0≦i≦M−1, and u≠v.