Adaptive Code Assignment Algorithm for a Multi-User/Multi-Rate CDMA System

作者：Yu Qiyue^*; Adachi Fumiyuki; Meng Weixiao

来源：IEICE - Transactions on Communications, 2009, E92B(5): 1600-1607.

DOI：10.1587/transcom.E92.B.1600

• code assignment
• code tree
• cost function
• DCA
• CDMA

Code division multiple access (CDMA) technique is used widely since it can flexibly support multi-rate multi-media services by changing the number of orthogonal spreading codes. In this paper, we present a new adaptive code assignment algorithm, which consists of three steps: reserved-space, improved-crowded-first-space, and multi-code combination to fully use the code space. Compared with the existing algorithms, the proposed algorithm can avoid the code blocking problem and lower its total blocking probability while keeping its computational complexity relatively low, Simulation results show that increasing the free space reduces the average total blocking probability while increasing the blocking probability of high rate users.

• 出版日期2009-5
• 单位哈尔滨工业大学