| 摘要 |
N channels of encoded data are added into added data, which is compared with a first threshold of 2 M -1 - A and a second threshold of 2 M -1 - 1, where M is the number of the bit positions of the binary representation of N and A is defined by 2 M - ( N + 1). When the added data is less than the first threshold, it is selected. When the added data falls between the first and second thresholds, inclusive, either the added data or shifted data, obtained by adding A to the added data, is selected. When the added data exceeds the second threshold, the shifted data is selected. Based on output data representing the values of the respective bit positions of the binary representation of the selected data, the k -th output data, where k is a natural number less than M , is amplified into k -th amplified data having an amplitude level of 2 k-1 , and the M -th output data is amplified into M -th amplified data having an amplitude level of 2 M -1 - A . The first to M -th amplified data are multiplexed into a CDM signal. The number of the amplifying circuits is decreased, thus reducing the component costs and the size of the circuitry. |
