Performance analysis of secure DSSS multiuser detection under near-far environment

Manna, Tanajit; Kole, Alok

doi:10.1109/icicpi.2016.7859713

Cited by 6 publications

(2 citation statements)

References 5 publications

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“…For example, the Positioning Reference Signal (PRS) in the cellular network cannot fully meet the commercial requirements as the discontinuous signal is hardly tracked which leads to a low range measurement accuracy [15]. Moreover, there are severe near-far effects between the positioning signals from different gNBs (next generation NodeBs or called 5G nodeBs) which makes the signals from far gNBs more difficult to be received [16], [17], [18]. Consequently, poor geometric distribution of gNBs is achieved which further worsen the positioning accuracy [19], [20].…”

Section: Introductionmentioning

confidence: 99%

Design and Performance Analysis of Multi-scale NOMA for 5G Positioning

Yin,

Cao,

Deng

et al. 2019

Preprint

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This paper presents a feasibility study for a novel positioning-communication integrated signal called Multi-Scale Non-Orthogonal Multiple Access (MS-NOMA) for 5G positioning. One of the main differences between the MS-NOMA and the traditional positioning signal is MS-NOMA supports configurable powers for different positioning users (P-Users) to obtain better ranging accuracy and signal coverage. Our major contributions are: Firstly, we present the MS-NOMA signal and analyze the Bit Error Rate (BER) and ranging accuracy by deriving their simple expressions. The results show the interaction between the communication and positioning signals is rather limited, and it is feasible to use the MS-NOMA signal to achieve high positioning accuracy. Secondly, for an optimal positioning accuracy and signal coverage, we model the power allocation problem for MS-NOMA signal as a convex optimization problem by satisfying the QoS (Quality of Services) requirement and other constraints. Then, we propose a novel Positioning-Communication Joint Power Allocation (PCJPA) algorithm which allocates the powers of all P-Users iteratively. The theoretical and numerical results show our proposed MS-NOMA signal has great improvements of ranging/positioning accuracy than traditional PRS (Positioning Reference Signal) in 5G, and improves the coverage dramatically which means more P-Users could locate their positions without suffering the near-far effect.

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Section: Introductionmentioning

confidence: 99%

Design and Performance Analysis of Multi-scale NOMA for 5G Positioning

Yin,

Cao,

Deng

et al. 2019

Preprint

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“…Meanwhile, the ranging result should be updated in time for the stability of the cluster configuration. To address these issues, multi-user detection (MUD) [14,15] techniques are often used in the satellite clusters based on the FD-CDMA communication system.…”

Section: Introductionmentioning

confidence: 99%

Approach to MAI cancellation for micro-satellite clusters

2019

Journal of Systems Engineering and Electronics

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With the development of micro-satellite technology, traditional monolithic satellites can be replaced by micro-satellite clusters to achieve high flexibility and dynamic reconfiguration capability. For satellite clusters based on the frequency division-code division multiple access (FD-CDMA) communication system, the inter-satellite ranging precision is usually constrained due to the influence of multi-address interference (MAI). The multi-user detection (MUD) is a solution to MAI, which can be divided into two categories: the linear detector (LD) and the non-linear detector (NLD). The general idea of the LD is aiming to make a better decision during the symbol decision process by using the information of all channels. However, it is not beneficial for the signal phase tracking precision. Instead, the principle of the NLD is to rebuild the interference signal and cancel it from the original one, which can improve the ranging performance at the expense of considerable delays. In order to enable simultaneous ranging and communication and reduce multi-node ranging performance degradation, this paper proposes an NLD scheme based on a delay locked loop (DLL), which simplifies the receiver structure and introduces no delay in the decision process. This scheme utilizes the information obtained from the interference channel to reconstruct the interference signal and then cancels it from the original delayed signal. Therefore, the DLL input signal-to-interference ratio (SIR) of the desired channel can be significantly improved. The experimental results show that with the proposed scheme, the standard deviation of the tracking steady error is decreased from 5.59 cm to 3.97 cm for SIR = 5 dB, and 13.53 cm to 5.77 cm for SIR = -5 dB, respectively.

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