Symbolic spectrum

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  • This book is published in print and online through the online OAPEN library ( OAPEN (Open Access Publishing in European Networks) is a collaborative initiative to develop and implement a sustainable Open Access publication model for academic books in the Humanities and Social Sciences. The OAPEN Library aims to improve the visibility and usability of high quality academic research by aggregating peer reviewed Open Access publications from across Europe.

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Particle Filtering for Joint Symbol and Code Delay Estimation in DS Spread Spectrum Systems in Multipath

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  • Radio Transmission Systems Mamoru Sawahashi 2.1 Direct Sequence Code Division Multiple Access (DS-CDMA) 2.1.1 Principles of DS-CDMA DS-CDMA is a radio-access technology that enables multiple access based on a spread spectrum system. Figure 2.1a shows how DS-CDMA works [1–3]. The transmitted data sequence is spread across the spectrum after being encoded by spreading codes, each of which is assigned uniquely to each user at a higher rate than the symbol rate of the information data.

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  • THUẬT NGỮ AWGN Additive White Gaussian Noise Tạp âm Gauss trắng cộng BER Bit Error Rate Tỷ số bit lỗi BPSK Binary Phase Shift Keying Modulation Điều chế khóa dịch pha hai trạng thái CDMA Code Division Multiple Access Đa truy nhập phân chia theo mã DPS Delay Power Spectrum Phổ công suất trễ FFT Fast Fourier Transform Biến đổi Fourier nhanh FSR FFT time to Symbol period Ratio in an OFDM symbol Tỷ số giữa thời gian FFT và chu kỳ ký hiệu OFDM ICI Inter Carrier Interference Nhiễu giữa các sóng mang IFFT Inverse Fast Fourier Transfo...

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  • Mixers are used to translate a signal spectrum from one frequency to another. Most modern RF/microwave transmitters, receivers and instruments require many of these devices for this frequency translation. The typical symbol for a mixer is shown in Figure

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  • MC-CDMA and MC-DS-CDMA In this chapter, the different concepts of the combination of multi-carrier transmission with spread spectrum, namely MC-CDMA and MC-DS-CDMA are analyzed. Several single-user and multiuser detection strategies and their performance in terms of BER and spectral efficiency in a mobile communications system are examined. 2.1 MC-CDMA 2.1.1 Signal Structure The basic MC-CDMA signal is generated by a serial concatenation of classical DSCDMA and OFDM. Each chip of the direct sequence spread data symbol is mapped onto a different sub-carrier.

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