PCMA

In recent years , with the increasingly demand of the broad band and multimedia communication , various powerful tools have been emerging in endlessly to increase the capacity of satellite channel and PCMA ( Paired Carrier Multiple Access ) is just one of them .

近年来，随着人们对宽带和多媒体信息需求的日益增长，各种卫星信道容量倍增技术层出不穷，成对载波多址（PCMA）技术即是其中的一种。

First , the dissertation analyzed the essential principle and scheme of the PCMA technique .

首先，课题分析了成对载波多址技术的工作原理及其应用。

Signal Suppression and Synchronization Technology for PCMA Satellite Communication Systems

PCMA卫星系统中信号抑制与同步技术

Performance degradation caused by timing error in PCMA system

PCMA系统中位定时误差对干扰抵消性能的影响

Signal Interception Method for Asymmetric PCMA Satellite Communication Systems

非对称PCMA卫星信号的截获方法

Interference cancellation performance degradation caused by timing error in PCMA System is then analyzed and simulated .

在此基础上研究了PCMA系统中位同步误差对干扰抵消性能的影响，并给出了相应的仿真结果。

PCMA ( Paired Carrier Multiple Access ) is a new way of multiple access in satellite communication .

双载波多路（PairedCarrierMultipleAccess，简称PCMA）是一种新兴的卫星通信多址技术。

Paired Carrier Multiple Access ( PCMA ) is a new technique which can be applied in two-way satellite communication systems .

成对载波多址（PCMA）是应用于双向卫星通信系统的一种新型频率复用技术。

The main contributions of this dissertation include : Introduce the basic concept and class of PCMA and then set up the base band transmission model .

本文承担的主要工作如下：1、介绍PCMA技术的基本概念与分类，分析其原理，然后建立了系统的基带传输模型。

Second , this paper built the base band transmission model of PCMA system , and a new parameter estimation algorithm was proposed on the basis of correlation function fitting .

其次，课题针对PCMA系统的特点建立了基带信号的传输模型，并从本地信号与有用信号的弱相关性入手，提出了基于相关函数拟合的PCMA系统参数估计算法。

Based on power controlled multiple access protocol ( PCMA ), a MAC protocol without head-of-line blocking ( PCMA + ) was proposed .

本文在功率控制多址接入协议（PCMA）的基础上，提出了消除队头阻塞的PCMA+协议。

This study not only provided a good method for analysis the active peptide in the PCMA , but also provided scientific ways for studying the stability of the PCMA .

本研究不仅为分析促细胞代谢素注射液的活性成份多肽提供了一种可行的方法，而且为研究其稳定性提供了科学的依据。

Simulation shows that , compared with PCMA in which FIFO queue is adopted , a good improvement will be obtained when in use of PCMA + .

大量仿真结果表明，PCMA+协议相对于采用FIFO队列的PCMA协议在性能上有较大的提高。

The SPC-MAC protocol eliminates the interference of the periodical transmission with the maximal power of PCM protocol , and does not need the extra channel of PCMA protocol .

该协议避免了PCM协议周期性的最大发射功率造成的干扰，也无需PCMA协议所设置的额外信道。

PCMA had the bilogical activity to promote the rat adipocytes to intake the H 3 D glucose , the stimulation indes μ > 2 0 ;

促细胞代谢素注射液具有促进大鼠脂肪细胞摄取3H标记的葡萄糖的生物活性，刺激指数μ>20。

Based on the introduction of paired carrier multiple access ( PCMA ) technology , a new algorithm was proposed to separate the satellite PCMA downlink mixed signals with independent component analysis ( ICA ) .

在介绍卫星新技术&PCMA（成对载波多址）技术的基础上，提出了基于ICA（独立分量分析）的新算法用来分离卫星PCMA的下行混合信号。

The ground , the former conditions , the key technology and the mode of PCMA are researched and analyzed first , then produce a way of frequency estimate via correlation , by compared with other frequency estimate methods .

本文首先分析和研究了PCMA技术的产生、前提条件、特点、关键技术和应用方式等，并通过与常用的频率估计方法作比较，找到了一种从相关值入手的思路。

PCMA is a fundamentally new technique for two-way satellite and a novel method for frequency re-use which allows two different earth stations to use the same frequency , time slots and / or CDMA code at the same time .

PCMA技术是用于双向卫星通信的一种崭新技术，是一种全新的频率复用方式，它允许两个不同的卫星地面站同时使用完全相同的频率、时隙或扩频码字。

Terpolymer of N-Cyclohexylmaleimide / Methyl Methacrylate / Acrylonitrile ( PCMA ) was synthesized by means of suspension polymerization and the prepared terpolymer was used as heat resistant modifier and blended with PVC .

通过悬浮共聚得到了N环己基马来酰亚胺（ChMI）、甲基丙烯酸甲酯（MMA）、丙烯腈（AN）三元共聚物（PCMA），用作耐热改性剂与PVC共混。