quadrature phase shift keying

Quadrature phase shift keying ( QPSK ) signaling is employed to make efficient use of the available bandwidth .

传输信号采用正交相移键控调制方式，以有效利用有限通信带宽。

Intersymbol - Interference and Jitter Free Offset - keyed Quadrature Phase Shift Keying ( IJF-OQPSK ) is a new modulation method in modern digital modulation techniques .

无符号间干扰和抖动－交错正交相移键控（IFJ－OQPSK）是现代数字调制技术中的一种新的调制方式。

All digital receiver of quadrature phase shift keying with large frequency shift correction

四相相移键控调制的抗大频偏的全数字接收机

Double Baseband Processing Offset Quadrature Phase Shift Keying Modulation Technique

两次基带处理&偏移正交相移键控调制技术

IJF-OQPSK is actually to modulate the IJF codes by the Offset Quadrature Phase Shift Keying .

IJF&OQPSK实际上是对IJF信号再进行正交四相相移键控的调制技术。

For quadrature phase shift keying ( QPSK ) modulation technique , a baseband DBF algorithm of smart antenna fixed beams is presented .

针对四相相移键控（QPSK）调制方式，本文提出了一种新的智能天线固定多波束基带DBF算法。

Feher patented Quadrature Phase Shift Keying ( FQPSK ), which is suitable for deep space communication , is introduced at first .

首先介绍了适用于深空通信的费赫尔正交移相键控（FQPSK）调制技术。

The performance estimation of quadrature phase shift keying ( QPSK ) signaling over a Rice lading channel was simulated and the corresponding analyzing results were obtained .

最后，对数字调制后的QPSK信号通过莱斯衰落信道时的性能进行了仿真估计，并得到相应的分析结果。

The applied background of high-data-rate demodulator is discussed and the composition and operation principle of a new multirate Quadrature Phase Shift Keying ( QPSK ) demodulator is introduced .

首先讨论了遥感卫星高速数据中频接收解调系统的应用背景，然后介绍了一种新型多速率中频QPSK解调器的组成和工作原理，并给出了该设备的性能测试方法和测试结果。

A QPSK blind sequence detection algorithm based on the ε - equalization principle is proposed . The algorithm can formulate the quadrature phase shift keying blind sequence detection into a quadratic programming with integer constraints .

给出了基于ε-均衡准则的QPSK序列盲检测算法，该算法将QPSK序列盲检测问题转化为带整数约束的二次规划问题。

As the key component of satellite digital video broadcast receive system and chip , this paper ( pre - )( sented ) the design of an all-digital quadrature phase shift keying ( QPSK ) demodulator .

作为数字卫星视频广播（DVB-S）接收芯片的核心组件，给出了一种全数字正交相移键控（QPSK）接收解调器的设计。

The aim of this thesis is to implement all digital modem of π / 4 offset differentially encoded quadrature phase shift keying (π / 4-DQPSK ), which belongs to a part of the wireless communication systems .

本课题是无线通信系统的一部分，目的实现全数字π/4-DQPSK调制解调。

OQPSK ( Offset Quadrature Phase Shift Keying ) modulation technology is a constant envelope modulation technology , which possesses the features of high spectrum and power utilization ratio . The modern method has been widely employed in satellite communication system and mobile communication system .

偏移正交相移键控（OQPSK：OffsetQuadraturePhaseShiftKeying）是一种恒包络调制技术，具有较高的频谱利用率和功率利用率，广泛应用于卫星通信系统和地面移动通信系统。

The modulation characteristic of Feher and Kato ′ s patented Quadrature Phase Shift Keying ( FQPSK-KF ) is studied , including theoretic analysis of its envelope trait and computation of its power spectral density ( PSD ) .

研究了FQPSK-KF的调制特性，理论推导了其包络特性，仿真计算了其功率谱密度（PSD），并与一些常见调制方式进行了比较；

This paper introduces the circuit principle for an fully digital π / 4 shift differentially encoded quadrature phase shift keying ( DQPSK ) modulation & demodulation . We apply the recently proposed 1 bit demodulation arithmetic , and successfully realized demodulation .

介绍了全数字π/4差分四相移相键控的（DQPSK）调制解调电路原理，应用最新提出的1bit解调算法成功实现解调，该算法大大简化了解调部分的数据处理。

Basing on the briefly introduction of the LSL ( least-squares lattice ) algorithm and QPSK ( quadrature phase shift keying ), a LSL adaptive equalizer for QPSK modulation is presented . The equalizer shows the good performances .

研究一基于LSL（最小平方格型）算法的QPSK（正交相移键控）自适应均衡器，均衡效果良好。

The ε - equalization principle which is different from the conventional zero-forcing equalization is deduced based on the quadrature phase shift keying ( QPSK ) alphabet . The necessary and sufficient condition of the existence of the ε - equalizer is proved .

在QPSK字符集下导出了与传统迫零均衡准则有本质不同的ε-均衡准则，并证明了ε-均衡器存在的充分及必要条件。

To do away with the fussiness of phase when carrier wave recovers in the coherent demodulation of quadrature phase shift keying ( QPSK ), the equations are deduced as to how to natural differential coder in the sender and decoder in the receiver .

为了消除四相相移键控（QPSK）调制方式中相干解调时载波恢复存在的相位模糊问题，本文推导了在收发两端所分别插入的自然码差分编译码方程。

In order to make the limited spectrum range accommodate more communication channels , some linear modulation techniques are proposed , such as QAM ( Quadrature Amplitude Modulation ), QPSK ( Quadrature Phase Shift Keying ), etc.

为了让有限的频谱范围能够容纳更多的通信信道，人们提出了一些线性调制技术，如：QAM（quadratureamplitudemodulation）、QPSK（quadraturephaseshiftkeying）等。