A signal sending method, comprising: modulating (101, 301), by a base station by using a first modulation scheme, signaling carried in a control channel, and modulating, by using a second modulation scheme, data carried in a traffic channel; and sending (102, 302), by the base station, a signal obtained after modulation to a user equipment, UE, wherein the control channel and the traffic channel are multiplexed using time division multiplexing, frequency division multiplexing, or space division multiplexing; wherein the first modulation scheme is a single-carrier modulation scheme, and the second modulation scheme is an orthogonal frequency division multiplexing, OFDM, modulation scheme; characterized in that the method further comprises: using, by the base station, a multiple access manner of Time Division Multiple Access, TDMA, for the control channel, so as to distinguish signaling of the UE from signaling of other UE; wherein the signaling carried in the control channel comprises the signaling of the UE and system message signaling, and the modulating, by a base station by using a first modulation scheme, signaling carried in a control channel comprises: classifying, by the base station, the signaling of the UE and the system message signaling into at least one group, wherein each group comprises at least a part of the signaling of the UE and at least a part of the system message signaling; and performing, by the base station, multiplexing and interleaving on signaling in each group, performing an N+M point discrete Fourier transform, DFT, on the signaling after the interleaving, and mapping, to a system resource of K points, M+N points obtained after the DFT, and then performing a K point inverse fast Fourier transform, IFFT, so as to obtain a single carrier, SC, symbol corresponding to each group; wherein M, N, and K are positive integers, and a sum of M and N is less than or equal to K. modulating (101, 301), by a base station by using a first modulation scheme, signaling carried in a control channel, and modulating, by using a second modulation scheme, data carried in a traffic channel; and sending (102, 302), by the base station, a signal obtained after modulation to a user equipment, UE, wherein the control channel and the traffic channel are multiplexed using time division multiplexing, frequency division multiplexing, or space division multiplexing; wherein the first modulation scheme is a single-carrier modulation scheme, and the second modulation scheme is an orthogonal frequency division multiplexing, OFDM, modulation scheme; characterized in that the method further comprises: using, by the base station, a multiple access manner of Time Division Multiple Access, TDMA, for the control channel, so as to distinguish signaling of the UE from signaling of other UE; wherein the signaling carried in the control channel comprises the signaling of the UE and system message signaling, and the modulating, by a base station by using a first modulation scheme, signaling carried in a control channel comprises: classifying, by the base station, the signaling of the UE and the system message signaling into at least one group, wherein each group comprises at least a part of the signaling of the UE and at least a part of the system message signaling; and performing, by the base station, multiplexing and interleaving on signaling in each group, performing an N+M point discrete Fourier transform, DFT, on the signaling after the interleaving, and mapping, to a system resource of K points, M+N points obtained after the DFT, and then performing a K point inverse fast Fourier transform, IFFT, so as to obtain a single carrier, SC, symbol corresponding to each group; wherein M, N, and K are positive integers, and a sum of M and N is less than or equal to K. using, by the base station, a multiple access manner of Time Division Multiple Access, TDMA, for the control channel, so as to distinguish signaling of the UE from signaling of other UE; wherein the signaling carried in the control channel comprises the signaling of the UE and system message signaling, and the modulating, by a base station by using a first modulation scheme, signaling carried in a control channel comprises: classifying, by the base station, the signaling of the UE and the system message signaling into at least one group, wherein each group comprises at least a part of the signaling of the UE and at least a part of the system message signaling; and performing, by the base station, multiplexing and interleaving on signaling in each group, performing an N+M point discrete Fourier transform, DFT, on the signaling after the interleaving, and mapping, to a system resource of K points, M+N points obtained after the DFT, and then performing a K point inverse fast Fourier transform, IFFT, so as to obtain a single carrier, SC, symbol corresponding to each group; classifying, by the base station, the signaling of the UE and the system message signaling into at least one group, wherein each group comprises at least a part of the signaling of the UE and at least a part of the system message signaling; and performing, by the base station, multiplexing and interleaving on signaling in each group, performing an N+M point discrete Fourier transform, DFT, on the signaling after the interleaving, and mapping, to a system resource of K points, M+N points obtained after the DFT, and then performing a K point inverse fast Fourier transform, IFFT, so as to obtain a single carrier, SC, symbol corresponding to each group; wherein M, N, and K are positive integers, and a sum of M and N is less than or equal to K.