下行64QAM是HSDPA(High Speed Downlink Packet Access)技术的延伸。由于在信道质量较好的时候可以采用比16QAM更高阶的调制,从而可以提高单用户的峰值速率以及整个系统的容量。64QAM理论上可以使空口峰值速率达到21Mbit/s,同时可提高系统平均吞吐率。实际应用环境中由于诸多因素限制导致用户上网速率较低。1 HSPA+网络现状CAT14以上的终端支持HSPA+,其中CAT21以上的是支持DC的终端。从现网的PCHR分析,焦作联通支持64QAM终端比例已经达到 Downstream 64QAM is an extension of HSDPA (High Speed ​​Downlink Packet Access) technology. As the better channel quality can be used when higher-order 16QAM modulation, which can improve the single-user peak rate and the capacity of the entire system. In theory, 64QAM can make the air interface peak speed reach 21Mbit / s, meanwhile can raise systematic average throughput rate. Due to many factors in the actual application environment, the user’s Internet access rate is lower. 1 HSPA + network status CAT14 and above terminals support HSPA +, of which CAT21 and above are DC-enabled terminals. From the current network PCHR analysis, Jiaozuo Unicom support 64QAM terminal ratio has been reached