CDMA radio multiplex transmitting device and CDMA radio multiplex receiving device

DETAILED DESCRIPTION The present invention is made in the light of the above described situation and its object is to provide an excellent transmitting device and its receiving device which can improve performance of a synchronous detection by improving reliability of a pilot symbols in a CDMA radio multiplex transmission.
In order to realize the above described object of the present invention, it is so arranged that the transmitting end transmits by periodically inserting the pilot symbols into one channel (one spreading code) only which is multiplexed in the multi code transmission.
While, the receiving end infers a line condition (transfer function) from the pilot symbols received and, on the basis of the information thus obtained, a synchronous detection of each channel multiplexed is preferred.
Particularly, it is so arranged that a transmitting data is not transmitted by other channel in a pilot transmitting period.
Or again, it is so arranged that the transmitting data is transmitted by other channel in the pilot transmitting period to the extent that reliability of the pilot symbols is not damaged largely (within a limit tolerable for practical use).
According to the present invention, at the transmitting end, interference with a pilot channel can be reduced by transmitting the pilot symbols by inserting it into one channel only.
Also, at the receiving end, reliability of the pilot symbols is increased due to reduction in interference with the pilot symbols, as a result of which the synchronous detection of all multiplexed channels becomes possible, thereby improving a detection performance.