A femtocell base station covering a femtocell located within a macro cell covered by a macrocell base station, wherein the femtocell base station is configured for limiting adjacent channel interference, the femtocell base station comprising: a transmitter for transmitting downlink signals to a first mobile station, wherein the first mobile station is located within the femtocell; characterized in that the femtocell base station comprises: a narrower transmit pulse-shaping filter, wherein the narrower transmit pulse-shaping filter is configured so that a bandwidth of the downlink signals that are transmitted by the femtocell base station to the first mobile station is less than a bandwidth of downlink signals that are transmitted by the macrocell base station to a second mobile station; a receiver for receiving uplink signals from the first mobile station; and a narrower receive pulse-shaping filter that matches a narrower transmit pulse-shaping filter at the first mobile station, wherein the narrower transmit pulse- shaping filter at the first mobile station is configured so that a bandwidth of the uplink signals that are transmitted by the first mobile station to the femtocell base station is less than a bandwidth of uplink signals that are transmitted by the second mobile station to the macrocell base station. a transmitter for transmitting downlink signals to a first mobile station, wherein the first mobile station is located within the femtocell; characterized in that the femtocell base station comprises: a narrower transmit pulse-shaping filter, wherein the narrower transmit pulse-shaping filter is configured so that a bandwidth of the downlink signals that are transmitted by the femtocell base station to the first mobile station is less than a bandwidth of downlink signals that are transmitted by the macrocell base station to a second mobile station; a receiver for receiving uplink signals from the first mobile station; and a narrower receive pulse-shaping filter that matches a narrower transmit pulse-shaping filter at the first mobile station, wherein the narrower transmit pulse- shaping filter at the first mobile station is configured so that a bandwidth of the uplink signals that are transmitted by the first mobile station to the femtocell base station is less than a bandwidth of uplink signals that are transmitted by the second mobile station to the macrocell base station. a narrower transmit pulse-shaping filter, wherein the narrower transmit pulse-shaping filter is configured so that a bandwidth of the downlink signals that are transmitted by the femtocell base station to the first mobile station is less than a bandwidth of downlink signals that are transmitted by the macrocell base station to a second mobile station; a receiver for receiving uplink signals from the first mobile station; and a narrower receive pulse-shaping filter that matches a narrower transmit pulse-shaping filter at the first mobile station, wherein the narrower transmit pulse- shaping filter at the first mobile station is configured so that a bandwidth of the uplink signals that are transmitted by the first mobile station to the femtocell base station is less than a bandwidth of uplink signals that are transmitted by the second mobile station to the macrocell base station.