WS(subscript k,j) (i) = W0(subscript k)×δ [(i − j × ∆) mod K] , k, i = 0, 1, . . . K − 1, j = 0, 1, . . . M − 1, where WS is the new subcarriers matrix, each row represents one subcarrier, k is the subcarrier index in W0 , i is the sampling index, j is the extending index, ∆ is the time shift unit, M is the subcarrier extending factor. In Fig.2, ∆1 and ∆2 mean different multiples of ∆: ∆1 = a ∗ ∆, ∆2 = b ∗ ∆, a 6= b. If a subcarrier in W0 is extended into K subcarriers with different time shift, K original subcarriers can generate R = K ×M subcarriers totally which construct the new subcarriers matrix WS . ∆ < K should be set to guarantee the overlapping between adjacent subcarriers, and symbol duration is N = K + (M − 1) × ∆. Thus, the dimension of the subcarriers matrix (WS ) in SN-OWDM is R × N.