DS-CDMA transmission method

• Main Authors: OKUMURA, YUKIHIKO, OKAWA, KOICHI, OHNO, KOJI, UEBAYASHI, SHINJI, SAWAHASHI, MAMORU
• Format: Patent
• Language: English; French; German
• Published: 04.06.2003
• Edition: 7
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; MULTIPLEX COMMUNICATION; TRANSMISSION; WIRELESS COMMUNICATIONS NETWORKS

A DS-CDMA transmission method using a code multiplexing method which transmits a signal generated by code multiplexing through a plurality of code channels, said DS-CDMA transmission method comprising, when assembling frames for respective code channels by adding to information symbols pilot symbols used for channel estimation for coherent detection at fixed intervals, the steps of: dividing N code channels between K blocks each consisting of H code channels, where N is the number of multiplexed code channels, K is the number of blocks, H is the number of code channels in the block, and N=HxK; adding pilot symbols at the same frame position in the H code channels in the same block; and shifting positions at which said pilot symbols are added from block to block such that the intervals between the closest pilot symbols become uniform with regard to the entire pilot symbols in the K blocks.