Frequency modulating apparatus and transmitting apparatus including the same, and frequency demodulating apparatus and receiving apparatus including the same

摘要

Provided are a frequency modulation/demodulation apparatus using a frequency selective baseband and a transmitting/receiving apparatus using the same. In a frequency selective baseband transmission technique or an FS-CDMA technique, a transmission rate is controlled according to communication channel environment, spread code groups are repeatedly selected in a receiving side so as to obtain a frequency diversity gain. Accordingly, it is possible to reduce interference between users. In addition, even in a case where strong interference induced from electronic exists, it is possible to implement low-power, stable human-body communication and to ensure a communication quality.

主权项

1. A frequency modulating apparatus, comprising:
a transmission rate controller configured to control a data transmission rate and a number of repetitive transmission times according to a communication channel environment; a data generator controlled by the transmission rate controller and configured to output serial data repetitively based on the number of repetitive transmission times; a serial-to-parallel converter configured to convert the serial data outputted from the data generator into parallel data; and a frequency selective spreader configured to select and output a frequency selective spread code corresponding to the parallel data, under the control of the transmission rate controller, wherein the transmission rate controller is configured to control the frequency selective spreader to select one of a plurality of spread code groups obtained by dividing 2N spread codes used for performing frequency spreading on the parallel data by 2M spread codes, using N−M frequency selective control bits, each spread code group including 2M spread codes, N being a natural number greater than 1, and M being a natural number smaller than N, and wherein the selected and outputted frequency selective spread code is selected from spread codes of the selected spread code group.