正交多用戶短參考差分混沌移位鍵控通信系統(tǒng)性能分析
doi: 10.11999/JEIT190778
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重慶郵電大學(xué)通信與信息工程學(xué)院 重慶 400065
基金項(xiàng)目: 國(guó)家自然科學(xué)基金(61771085, 61371164)，重慶市教育委員會(huì)科研項(xiàng)目(KJQN201900601, KJ1600407)
Performance Analysis of Orthogonal Multiuser Short Reference Differential Chaos Shift Keying Communication System
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School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
Funds: The National Natural Science Foundation of China (61771085, 61371164), The Research Project of Chongqing Educational Commission (KJQN201900601, KJ1600407)
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摘要: 針對(duì)差分混沌移位鍵控系統(tǒng)傳輸速率和能量效率低的缺點(diǎn)，該文提出一種正交多用戶短參考差分混沌移位鍵控(OMU-SR-DCSK)通信系統(tǒng)。系統(tǒng)將參考信號(hào)長(zhǎng)度縮短為每個(gè)信息承載信號(hào)長(zhǎng)度的1/P，并在參考時(shí)隙后增加了兩路連續(xù)的信息時(shí)隙，每個(gè)信息時(shí)隙內(nèi)，N個(gè)用戶信息在Walsh碼正交特性作用下同時(shí)傳輸，利用Walsh碼的正交特性可完全消除用戶間干擾，從而改善系統(tǒng)誤碼性能。推導(dǎo)了OMU-SR-DCSK在加性高斯白噪聲(AWGN)信道和Rayleigh衰落信道下的理論比特誤碼率(BER)公式并進(jìn)行了仿真。仿真結(jié)果和理論推導(dǎo)的吻合證明了理論推導(dǎo)的正確性，從而為OMU-SR-DCSK應(yīng)用于多用戶串行傳輸系統(tǒng)提供了理論依據(jù)。Abstract: An Orthogonal MultiUser Short Reference Differential Chaos Shift Keying (OMU-SR-DCSK) communication system is proposed to overcome the dominant drawbacks of DCSK system relating to low transmission rate and energy efficiency. The proposed system shortens the reference signal to 1/P of information bearing signal. Two consecutive information time slots are added after the reference time slot. Due to the excellent features of Walsh codes, the system sends information from N users in one information time slot. Meanwhile, the use of orthogonality of the Walsh code eliminates completely intra-signal interference and enhances the performance of Bit Error Rate (BER) better. The theoretical BER formula of OMU-SR-DCSK over Additive White Gaussian Noise (AWGN) channel and Rayleigh fading channel are derived and simulations are carried out respectively. The coincidence between the simulation results and the theoretical derivations proves the correctness of the theoretical derivation, providing a theoretical basis for the application of OMU-SR-DCSK to multiuser serial transmission system.
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表 1 OMU-SR-DCSK, SRMR-DCSK, VHE-DCSK和MC-DCSK系統(tǒng)的能量效率及傳輸速率
系統(tǒng)名稱 傳輸速率(${R_B}$) 能量效率(${E_\eta }$) OMU-SR-DCSK ${{2N} / {(R + 2\beta )}}$ ${{2N\beta } / {(R + 2N\beta )}}$ SRMR-DCSK ${N / {(R + \beta )}}$ ${{N\beta } / {(R + N\beta )}}$ VHE-DCSK ${N / {(2\beta }})$ ${N / {(1 + N)}}$ MC-DCSK ${N / \beta }$ ${N / {(1 + N)}}$ 
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