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Research on Signal Detection for Software Radios

Author: ZhangZuo
Tutor: LiJianDong
School: Xi'an University of Electronic Science and Technology
Course: Communication and Information System
Keywords: Software Defined Radio Digital Signal Processing (DSP) Modulation and demodulation Sync adjustment Software algorithms
CLC: TN925
Type: PhD thesis
Year: 2001
Downloads: 1327
Quote: 6
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Abstract


The so-called software-defined radio, is the use of radio communications software implementation of the various functions, is the transition from analog radio to digital ground again after the transformative leap. Software radio is a revolution in wireless transmission system, it will greatly reduce the communication terminal of the shackles of the hardware, known as \Software Radio will be widely used in telecommunications, transportation, trade and other industries and military fields, with huge economic and social value. This paper mainly for software radio signal detection techniques are discussed. The main research contents and the results obtained are as follows: 1. The basic principle of the software radio and key technologies in-depth study. The use of sub-sampling and multi-rate digital signal processing technology, can be arbitrary IF signal downconverted to a fixed low-IF or baseband. In the existing technical conditions, to achieve high-frequency on the AD conversion, thereby increasing the degree of radio software. And proposes a practical software radio architecture, to design a DSP chip based on two hardware platforms that can support any of the following 100MHz IF frequency signal processing. 2. For the various modulation formats signals, the completed, including AM, FM, M-DPSK, FSK, MSK modulation and demodulation of signals such as software algorithms. The proposed general-purpose digital modulation and demodulation algorithm requires only pre-determined signal system and some of the parameters, you can achieve all related to the phase modulation signal (including M-DPSK, FSK and MSK, etc.) processing, the data rate can be 2Mb / s within the following ranges arbitrary transformations. Software program uses a modular design, with good versatility and portability. 3. A novel based on the minimum mean square error (MMSE) criterion universal symbol timing synchronization algorithm. The algorithm first pre-demodulated signal sampling point, each sample is calculated demodulation error, select the minimum mean square error of samples as a quasi-optimal decision point. And performing the interpolation process, or an estimate of the timing error correction, end time to get the best decision for demodulation. The algorithm versatility, use of limited computing resources to effectively implement the various digital signal symbol synchronization. 4. Proposed a criterion based on the same adaptive MMSE channel estimation and compensation algorithms. Algorithm uses autocorrelation characteristics, the optimal decision time to accurately estimate the quality of the channel (including the timing error, frequency offset, fading, phase distortion, etc.). While using the estimated channel quality parameter of the input signal is compensated accordingly, improve the overall performance. This algorithm combines the demodulation and synchronization, using the calculation results of their channel estimation. Consuming less computing resources. 5. Studied and implemented a new suit of software radio modulation mode - Variable rate QAM modulation. This basic principle and its detailed analysis of performance, and gives a practical implementation. Variable rate QAM transmission system according to the channel quality of adaptively adjusting signal transmission rate, to ensure reliable reception quality in case of spectrum efficiency as much as possible, thereby increasing system capacity.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Radio relay communications,microwave communications
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