Research on Spread-Spectrum Modulation and Demodulation System Using Real-Valued Orthogonal Pseudonoise Sequences

利用实值正交伪噪声序列的扩频调制解调系统研究

• 批准号: 02650249
• 负责人: TANADA Yoshihiro
• 金额: $ 1.41万
• 依托单位: Kagoshima University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650249/
• 关键词: Real-valued orthogonal pseudonoise sequence; Amplitude-modulated code; Pulse-width-modulated code; Spread-spectrum communication; Quasi-synchronous SSMA; Digital correlation processing; Process gain; Desired to undesired signal ratio; DU比; スペクトル拡

This research has been performed from 1990 to 1991, for the purpose of developing spread-spectrum modulation and demodulation system using real-valued orthogonal pseudonoise sequences with the better crosscorrelation properties than those of M-sequences and of urging the practical application of this system to high-quality spread-spectrum communication system. The process from design to experiment has been investigated to be understandable for the engineers in this field.It is shown that the synchronous or quasi-synchronous spread-spectrum transmission of the amplitude-modulated code and the pulse-width-modulated code enables multichannel interference suppressed to the low level according to theory. The experimental system adopts digital signal processing at a low frequency range, but a high-speed special processor will realize a practical system of high bit rate. The achievements of this project are the followings.(1)Design of modulation and demodulation systemAn amplitude-modulated c … More ode and a pulse-width-modulated code as well as correlation processing are designed so that multichannel interference does not occur in a synchronous or quasi-synchronous spread-spectrum multiple access. Effects of quantization error, additive noise and frequency band on correlator output are made clear through analysis and simulation.(2)Construction of modulation and demodulation systemIn the constructed system, the amplitude-modulated code or the pulse-width-modulated code due to the real-valued pseudonoise sequences of 256 length, passes through a band-pass transmission channel and is demodulated by a front- or back-end digital correlator based on the fast Fourier transform.(3)Experiment for estimating modulation and demodulation systemWhen two different codes are multiplexed and demodulated along with additive noise, correlator output waveform, process gain, improvement ratio of desired to undesired signal ratio and bit error rate show the high performance of the values close to theory. Less

本研究是在1990 ~ 1991年进行的，目的是研制一种使用互相关性能优于M序列的实值正交噪声序列的扩频调制解调系统，并促使这种系统在高质量扩频通信系统中得到实际应用。从设计到实验的全过程进行了分析，从理论上说明了调幅码和脉宽码的同步或准同步扩频传输可以将多信道干扰抑制到很低的水平。实验系统采用低频数字信号处理，但高速专用处理器将实现高比特率的实用系统。本项目取得的成果如下。（1）调制解调系统的设计 ...更多信息 码和脉宽调制码以及相关处理被设计成使得在同步或准同步扩频多址中不发生多信道干扰。通过分析和仿真，明确了量化误差、加性噪声和频带对相关器输出的影响。（2）调制解调系统的构建在所构建的系统中，由256长度的实值噪声序列产生的幅度调制码或脉宽调制码通过带通传输信道，并由基于快速傅立叶变换的前端或后端数字相关器解调。（3）调制解调系统性能评估实验表明，当两个不同的码在加性噪声中沿着复用解调时，相关器的输出波形、处理增益、信杂比改善率和误码率等性能指标均接近理论值。少

项目成果

棚田 嘉博: "パルス圧縮多重ソ-ナに適用した実数谷交PN系列の実験的検証" 電子情報通信学会論文誌(BーII). J74ーBーII. 215-224 (1991)

Yoshihiro Tanada：“应用于脉冲压缩多路复用声纳的真实谷交叉 PN 序列的实验验证”电子、信息和通信工程师学会会刊 (B-II) (J74-B-II)。

棚田 嘉博: "実数直交PN符号の変復調処理" 情報理論とその応用学会第14回シンポジウム論文集. 14ーSAーBーIIー2. 657-660 (1991)

Yoshihiro Tanada：“实正交 PN 码的调制和解调处理”信息理论与应用学会第 14 届研讨会论文集 14-SA-B-II-2 (1991)。

棚田 嘉博: "実数直交擬似雑音系列を用いた画像の符号化スクランブル伝送" 電子情報通信学会技術研究報告. SSTA90ー36. 15-22 (1990)

Yoshihiro Tanada：“使用真实正交伪噪声序列编码图像的扰乱传输” IEICE 技术报告 15-22 (1990)。

Yoshihiro TANADA: "Experimental Verification of Real‐Valued Orthogonal PN Sequence Applied to Pulse Compression Sonar" Electronics and Communications in Japan,Part1. (1992)

Yoshihiro TANADA：“实值正交 PN 序列应用于脉冲压缩声纳的实验验证”，日本电子与通信，第 1 部分（1992 年）。

棚田 嘉博: "実数直交擬似雑音系列を用いた画像の符号化・スクランブル伝送" 電子情報通信学会技術研究報告. SSTA90ー36. 15-22 (1990)

Yoshihiro Tanada：“使用真实正交伪噪声序列的图像编码和加扰传输”IEICE 技术报告 15-22 (1990)。