多用戶共享接入系統(tǒng)擴(kuò)展序列優(yōu)化與改進(jìn)
doi: 10.11999/JEIT170618 cstr: 32379.14.JEIT170618
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2.
(重慶郵電大學(xué)移動通信重點(diǎn)實(shí)驗(yàn)室 重慶 400065)
基金項(xiàng)目:
國家科技重大專項(xiàng)(2016ZX03001010)，重慶市教委科學(xué)技術(shù)研究項(xiàng)目(KJ1704098)
Optimization and Improvement of the Spreading Sequence in Multi-user Shared Access System
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2.
(Chongqing Key Laboratory of Mobile Communication Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China)
Funds:
The National Science and Technology Major Project (2016ZX03001010), The Scientific and Technological Research Program of Chongqing Municipal Education Commission (KJ1704098)
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摘要: 多用戶共享接入是一種非正交多址接入技術(shù)，由于采用了復(fù)數(shù)域擴(kuò)頻技術(shù)，其性能必然受到擴(kuò)展序列的影響，因此需要對擴(kuò)展序列進(jìn)行優(yōu)選和改進(jìn)。針對現(xiàn)有序列優(yōu)選算法在進(jìn)行互相關(guān)優(yōu)選時(shí)只考慮了互相關(guān)峰值的影響，該文提出一種改進(jìn)的序列優(yōu)選算法，該優(yōu)選算法同時(shí)考慮了互相關(guān)峰值和互相關(guān)均方值的影響，仿真分析表明，系統(tǒng)使用該文提出的優(yōu)選算法比使用現(xiàn)有的優(yōu)選算法優(yōu)選出的序列在相同BER時(shí)，可以改善0.9 dB左右的SNR性能。此外，擴(kuò)展序列的隨機(jī)選取會導(dǎo)致序列發(fā)生碰撞，為降低碰撞概率，該文利用星座圖的增益指數(shù)特性，提出一類改進(jìn)的復(fù)擴(kuò)展序列。該文提出的改進(jìn)復(fù)序列比MUSA使用的三元復(fù)序列具有更高的星座圖增益指數(shù)，經(jīng)過優(yōu)選后，可以優(yōu)選出數(shù)量更多的優(yōu)良序列，在相同BER下與優(yōu)選后的三元復(fù)序列相比，可以改善1 dB左右的性能，在BER為10-13時(shí)，用戶過載率可以提高15%左右，進(jìn)一步改善系統(tǒng)性能。
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關(guān)鍵詞:
- 多用戶共享接入 /
- 非正交多址接入 /
- 復(fù)數(shù)域擴(kuò)頻 /
- 擴(kuò)展序列 /
- 星座圖增益指數(shù)
Abstract: Multi-User Shared Access (MUSA) is a non-orthogonal multiple access technology, and its performance will be affected by the spreading sequence due to the usage of complex domain spread spectrum technology, so the spreading sequences should be optimized and improved. Considering the problem that only the influence of cross-correlation peak is taken into account in the process of cross-correlation optimization in the existing optimization algorithm, an improved spreading sequence optimization algorithm is proposed. Both the influences of cross-correlation peak and the cross-correlation mean square are taken into consideration. The simulation results show that the proposed algorithm can promote 0.9 dB SNR performance in the same BER than the existing algorithm. In addition, the random selection of the spreading sequences will lead to the collision of the sequence. In order to reduce the collision probability, a set of improved complex spreading sequences based on constellation figure of merit is proposed. The proposed complex sequence has a higher constellation figure of merit than the triple-level complex spreading sequence. Additionally, more excellent spreading sequences can be obtained after optimization, and when compared with the optimized triple-level complex spreading sequence, the SNR performance can promote about 1 dB in the same BER and the user overloading ratio can improve 15% when BER is 10-13, which can further promote the performance of MUSA system. -
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