Sam . . wideband air interface - scalable adaptive modulation physical layer specification - public safety wideband data standards project - digital radio technical standards 宽带空中接口.可扩缩自适应调制
This paper , special research object is the qam constellation controllable adaptive modulation system , symbol rate and modulation level controllable adaptive modulation system 本文以qam星座可调的自适应调制系统、符号率及调制电平可控的自适应调制系统为具体的研究对象。
Some new technologies are introduced in hsdpa , including a shorter transimission time interval ( tti ) 、 adaptive modulation and coding ( amc ) scheme and a fast physical layer hybrid arq mechanism 在该系统中采用了以下技术:更短的传输时间间隔,物理层的混合自动重传,自适应编码调制等。
Afterwards we theoretically analyze and conclude the model of the adaptive modulation system . we find out three kinds of channel model appropriated for actual cannels and draw out pulse response matrix equations 然后,从理论上分析和推导了自适应调制系统的模型,给出了适合实际信道的三种信道模型结构并推导了脉冲响应矩阵方程。
Next , based on the throughput performance of fixed modulation schemes in packet transmission , adaptive modulation with throughput maximization under fading channel is investigated and significant throughput improvement is obtained 接着,基于固定调制方案的分组传输吞吐量性能,本文研究了衰落信道中吞吐量最大化自适应调制技术,该方法可以取得显著的吞吐量性能增益。