CN107147602B - 基于信号相位补偿的差分接收方法及装置 - Google Patents

基于信号相位补偿的差分接收方法及装置 Download PDF

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CN107147602B
CN107147602B CN201710237437.0A CN201710237437A CN107147602B CN 107147602 B CN107147602 B CN 107147602B CN 201710237437 A CN201710237437 A CN 201710237437A CN 107147602 B CN107147602 B CN 107147602B
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肖琨
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
    • H04L27/2053—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases
    • H04L27/206—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers
    • H04L27/2067—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states
    • H04L27/2071—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states in which the data are represented by the carrier phase, e.g. systems with differential coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/38—Demodulator circuits; Receiver circuits
    • H04L27/3845—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier
    • H04L27/3854—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier using a non - coherent carrier, including systems with baseband correction for phase or frequency offset

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Abstract

本发明公开了一种基于信号相位补偿的差分接收方法及装置。所述方法首先利用乘法器将接收信号在I、Q两路上分别与本地载波相乘，获得YI信号和YQ信号，对所述YI信号和YQ信号进行差分译码及一系列处理后再进行差分编码。将差分编码后的输出以及所述YI信号和YQ信号通过I、Q两路信道变化估计模块得到I、Q两路信号的补偿相位φI和φQ，以所述补偿相位φI和φQ分别对接收信号在I、Q两路上做相位补偿。本发明提供的差分接收技术有助于提升系统性能，降低实现复杂度，具有应用价值和良好的可扩展性。

Description

基于信号相位补偿的差分接收方法及装置
技术领域
本发明属于无线通信技术领域，具体涉及一种基于信号相位补偿的差分接收方法及装置。
背景技术
数字视频广播(DVB:digital video broadcasting)和数字音频广播(DAB:digital audio broadcasting)是两个领先的向移动终端广播多媒体业务的标准，DVB包括地面(DVB-T)和手持(DVB-H)两个版本，DAB向多媒体扩展成为T-DMB(Terrestrial DigitalMultimedia Broadcasting)。DAB和T-DMB采用差分调制，接收端使用非相关检测，简化了接收机设计。研究表明，对于使用传统差分检测(CDD：Conventional DifferentialDetection)技术的工作在L波段Mode IV的DAB接收机，在典型的城市多径信道环境中，当运动在95公里/小时甚至更高速度时，不能获得好的音频质量，意味着在高速公路上快速移动的接收机无法获得满意的DAB服务。
多符号差分检测(MSDD：Multiple Symbol Differential Detection)在差分检测中利用两个以上相邻的接收符号，性能优于CDD，但是MSDD要求更高的计算复杂度。类似复杂度很高的检测方式还包括判决反馈差分检测(DFDD:Decision-feedback DifferentialDetection)。而直接判决相关检测(DDCD:Decision-directed Coherent Detection)由于发生在不同子载波上的随机判决误差引入的判决反馈中的相位模糊问题，相对于CDD的性能改进是微小的甚至没有改进。Turbo-DPSK执行迭代turbo译码，将差分编码作为码率为Ns/(1+Ns)的trellis码对待，其中Ns是每一个差分编码块的数据符号的数目，最小均方递归(LMS:Least Mean Square Recursive)算法跟踪功放和相邻DPSK符号之间的移动信道引入的非线性失真，这两种技术的性能很好，但也存在复杂度过高的实现问题。
发明内容
本发明提供一种通过相位补偿改善接收机性能的差分接收方法。本发明首先利用乘法器将接收信号在I、Q两路(其中：I路是用本地载波cos[(wc+Δw)t+ψ]解调接收信号的支路,Q路是用本地载波sin[(wc+Δw)t+ψ]解调接收信号的支路)上分别与本地载波相乘，经过低通滤波，获得YI信号和YQ信号，对所述YI信号和YQ信号进行差分译码及一系列处理后再进行差分编码。将差分编码后的输出以及所述YI信号和YQ信号通过I、Q两路信道变化估计模块得到I、Q两路信号的补偿相位φI和φQ，以所述补偿相位φI和φQ分别对接收信号在I、Q两路上做相位补偿。
本发明所提供的高速移动环境中的差分接收方法，为高速移动接收机的设计与实现提供了有益的思路。目前差分接收技术的研究大多针对QPSK差分调制，QPSK调制的频带利用率比16QAM低一倍。本发明提供的差分接收技术有助于提升系统性能，降低实现复杂度，具有应用价值；本发明还可以进一步扩展到更高阶的调制，如64QAM、256QAM等，获得更高阶调制下的差分接收技术，具有良好的可扩展性。
附图说明
图1描述了16QAM差分接收机的架构。
具体实施方式
实施例接收机架构如图1所示，包括I路和Q路相位补偿模块、低通滤波模块、差分译码模块、并/串转换模块、解交织和信道译码模块、重新信道编码和交织模块、串/并转换模块、I、Q两路差分编码模块、I、Q两路信道变化估计模块以及生成本地载波和乘法运算等。
16QAM调制根据星座图不同可分为16进制方形QAM和16进制星形QAM。相比16进制方形QAM的3种振幅和12种相位，16进制星形QAM只有2种振幅和8种相位，更容易进行差分调制和解调。16进制星形QAM的每一个符号由4个比特组成，其中的第一个比特，通过差分的方式改变QAM向量的振幅：当输入比特为“1”，则当前符号信号的振幅与前一个符号信号的振幅不同；当输入比特为“0”，则当前符号信号的振幅与前一个符号信号的振幅相同。每一个符号的其余三比特，通过相位编码得到前后符号的相位差，即输入数据代表当前符号信号与前一符号信号的相位差。以上是输入数据与振幅、相位差的一种可行的编码关系，但不限于此，在此不一一列举。
本实施例的具体步骤如下：
(1)假设信道对I、Q两路信号的相位变化影响相同，第k个符号的接收信号为Rk(t)＝Akcos(wct+φk+θk)，kts≤t≤(k+1)ts，ts为符号周期，Ak为第k个符号的接收信号振幅，θk为第k个符号的接收信号相位，φk为第k个符号和第k-1个符号的信道响应的相位差，开始不进行相位补偿，即φI＝φQ＝0，φI、φQ分别为I、Q两路的补偿相位。
(2)在I路上，Rk(t)与I路的本地载波cos[(wc+Δw)t+ψ]相乘，Δw、ψ分别为本地载波的频偏和相偏，再经过低通滤波输出YI；在Q路上，Rk(t)与Q路的本地载波sin[(wc+Δw)t+ψ]相乘，再经过低通滤波输出YQ。
(3)对YI和YQ进行差分译码后，对译码输出做并/串转换，接着对串行输出解交织和做信道译码，然后做出判决。
(4)对判决的输出重新进行信道编码和交织，接着进行串/并转换，然后进行I、Q两路差分编码。
(5)将I、Q两路差分编码后的输出以及YI和YQ送入I、Q两路信道变化估计模块，得到I、Q两路的补偿相位φI和φQ。可以通过最小二乘估计获得前后两个符号的信道响应，从而获得前后两个符号的信道响应的相位差，用于相位补偿。信道变化估计方法不限于上述方法，在此不一一列举。
(6)利用φI和φQ对接收信号进行I、Q两路相位补偿，经过相位补偿，接收信号为R′k(t)＝Ak cos(wct+θk)，kts≤t≤(k+1)ts。
(7)在I路上，R′k(t)与I路的本地载波cos[(wc+Δw)t+ψ]相乘，再经过低通滤波输出Y′I；在Q路上，R′k(t)与Q路的本地载波sin[(wc+Δw)t+ψ]相乘，再经过低通滤波输出Y′Q。
(8)对Y′I和Y′Q进行差分译码后，对译码输出做并/串转换，接着对串行输出解交织和信道译码，然后做出判决并输出判决结果。
当一次补偿的精度不够时，可以参照步骤(4)和步骤(5)得到新的相位变化，进行多次相位补偿处理，直到性能达到要求。

Claims (1)

1.一种基于信号相位补偿的差分接收方法，所述方法包括如下步骤：
(1)在信道对I、Q两路信号的相位变化影响相同的情况下，第k个符号的接收信号为Rk(t)＝Akcos(wct+φk+θk)，kts≤t≤(k+1)ts，ts为符号周期，Ak为第k个符号的接收信号振幅，θk为第k个符号的接收信号相位，φk为第k个符号和第k-1个符号的信道响应的相位差，开始不进行相位补偿，即φI＝φQ＝0，φI、φQ分别为I、Q两路的补偿相位；
(2)在I路上，Rk(t)与I路的本地载波cos[(wc+Δw)t+ψ]相乘，Δw、ψ分别为本地载波的频偏和相偏，再经过低通滤波输出YI；在Q路上，Rk(t)与Q路的本地载波sin[(wc+Δw)t+ψ]相乘，再经过低通滤波输出YQ；
(3)对YI和YQ进行差分译码后，对译码输出做并/串转换，接着对串行输出解交织和做信道译码，然后做出判决；
(4)对判决的输出重新进行信道编码和交织，接着进行串/并转换，然后进行I、Q两路差分编码；
(5)将I、Q两路差分编码后的输出以及YI和YQ送入I、Q两路信道变化估计模块，得到I、Q两路的补偿相位φI和φQ，通过最小二乘估计获得前后两个符号的信道响应，从而获得前后两个符号的信道响应的相位差，用于相位补偿；
(6)利用φI和φQ对接收信号进行I、Q两路相位补偿，经过相位补偿，接收信号为R′k(t)＝Akcos(wct+θk)，kts≤t≤(k+1)ts；
(7)在I路上，R′k(t)与I路的本地载波cos[(wc+Δw)t+ψ]相乘，再经过低通滤波输出Y′I；在Q路上，R′k(t)与Q路的本地载波sin[(wc+Δw)t+ψ]相乘，再经过低通滤波输出Y′Q；
(8)对Y′I和Y′Q进行差分译码后，对译码输出做并/串转换，接着对串行输出解交织和信道译码，然后做出判决并输出判决结果。
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