An apparatus for wireless communication, comprising: a processor configured to generate a packet for transmission via a wireless signal, wherein the packet is generated for transmission over a bandwidth of 1 MHz using at least one orthogonal frequency-division multiplexing, OFDM, symbol; and a transmitter configured to transmit the packet via the wireless signal having a power spectral density, wherein: the power spectral density within ±0.45 MHz of a center frequency of the wireless signal is at a first power spectral density level; the power spectral density between 0.45 MHz and 0.6 MHz from the center frequency of the wireless signal and between -0.45 MHz - and -0.6 MHz from the center frequency of the wireless signal is less than the first power spectral density level; the power spectral density between 0.6 MHz and 1 MHz from the center frequency of the wireless signal and between -0.6 MHz and -1 MHz from the center frequency of the wireless signal is less than -20 dBr with respect to the first power spectral density level; the power spectral density between 1 MHz and 1.5 MHz from the center frequency of the wireless signal and between -1 MHz and -1.5 MHz from the center frequency of the wireless signal is less than -28 dBr with respect to the first power spectral density level; and the power spectral density of greater than ±1.5 MHz from the center frequency of the wireless signal is less than -40 dBr with respect to the first power spectral density level. a processor configured to generate a packet for transmission via a wireless signal, wherein the packet is generated for transmission over a bandwidth of 1 MHz using at least one orthogonal frequency-division multiplexing, OFDM, symbol; and a transmitter configured to transmit the packet via the wireless signal having a power spectral density, wherein: the power spectral density within ±0.45 MHz of a center frequency of the wireless signal is at a first power spectral density level; the power spectral density between 0.45 MHz and 0.6 MHz from the center frequency of the wireless signal and between -0.45 MHz - and -0.6 MHz from the center frequency of the wireless signal is less than the first power spectral density level; the power spectral density between 0.6 MHz and 1 MHz from the center frequency of the wireless signal and between -0.6 MHz and -1 MHz from the center frequency of the wireless signal is less than -20 dBr with respect to the first power spectral density level; the power spectral density between 1 MHz and 1.5 MHz from the center frequency of the wireless signal and between -1 MHz and -1.5 MHz from the center frequency of the wireless signal is less than -28 dBr with respect to the first power spectral density level; and the power spectral density of greater than ±1.5 MHz from the center frequency of the wireless signal is less than -40 dBr with respect to the first power spectral density level. the power spectral density within ±0.45 MHz of a center frequency of the wireless signal is at a first power spectral density level; the power spectral density between 0.45 MHz and 0.6 MHz from the center frequency of the wireless signal and between -0.45 MHz - and -0.6 MHz from the center frequency of the wireless signal is less than the first power spectral density level; the power spectral density between 0.6 MHz and 1 MHz from the center frequency of the wireless signal and between -0.6 MHz and -1 MHz from the center frequency of the wireless signal is less than -20 dBr with respect to the first power spectral density level; the power spectral density between 1 MHz and 1.5 MHz from the center frequency of the wireless signal and between -1 MHz and -1.5 MHz from the center frequency of the wireless signal is less than -28 dBr with respect to the first power spectral density level; and the power spectral density of greater than ±1.5 MHz from the center frequency of the wireless signal is less than -40 dBr with respect to the first power spectral density level.