A transmitting device and a receiving device. The receiving device includes: a signal to noise ratio measuring device, configured to measure a signal to noise ratio of a pilot frequency aggregation bit stream after demodulation and before coding; a pilot frequency parameter adjusting device configured to adaptively adjust a width of the pilot frequency aggregation and/or interval of pilot frequency clusters according to the signal to noise ratio measured by the signal to noise ratio measuring device; and a frequency parameter reporting device configured to report the width of pilot frequency aggregation and/or the pilot frequency cluster interval adjusted by the pilot frequency parameter adjusting device to the transmitting device.