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Case study and performance evaluation of MDMA–A non-orthogonal multiple access scheme for 5G cellular systems

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A Correction to this article was published on 11 January 2018

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Abstract

Multipath division multiple access (MDMA) has recently been proposed as a non-orthogonal multiple access scheme which exploits multipath domain to separate its users [1]. It is claimed that both the system capacity and total data throughput can be enhanced to a large amount. Yet, it is at its early stage of developments and it needs to be further investigated and clarified for its real use. In this paper, the feasibility and realizability of the MDMA cellular system are demonstrated by computer simulation. The receiver operation is also described in detail. Besides, the system performance is compared with those claimed in the original paper [1]. In addition, practical considerations on implementing the MDMA cellular system are discussed as well. With considerable amount of channel estimation error, it is shown that the system can still achieve 16 bps/Hz/cell with 300 BS antennas in cellular spectrum efficiency, which is an order of magnitude larger than the currently used first-generation to fourth-generation multiple access schemes. Thus, the MDMA can be considered as an implementable and spectrum efficient non-orthogonal multiple access scheme for future 5G systems.

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Change history

  • 11 January 2018

    The original version of this article unfortunately contained mistakes in Table 1, Footnote 11, and Eqs. 2, 4, 6, 21, 23, 24, 25, 29, 34, 36, and 38.

Notes

  1. The cellular spectrum efficiency is calculated here in the unit of bps/Hz/cell, which refers to the ratio of the total data throughput to a given transmission bandwidth in each cell.

  2. The user capacity plot is illustrated in terms of bit error rate vs. the maximum number of served users.

  3. By a call we mean either the conventional voice call or the data packet transmission.

  4. The downlink broadcast channel reveals necessary system information such as random access time slot index, BS identification, etc.

  5. For the carrier frequency of 1 GHz and regular vehicle speed of 30 m/s, the coherence time can be calculated from [17] to be 1790 μs. Since the coherence time is inversely proportional to the carrier frequency, the coherence time at 30 GHz is 1/30 of that at 1GHz, which is about 60 μs. Thus, the MDMA system estimates the channel every other 20 μs for which the channel remains almost unchanged.

  6. It is assumed that P1(t) meets the Nyquist pulse shaping criterion, in general L′ > L, whereL′is the total number of discrete-time channel taps.

  7. The cochannel interference is not included here for the discussion of the MUD receiver, whose effects due to CCI can be referred to [22] for more detail.

  8. Orthogonality here refers to the desired correlation properties of the Zadoff-Chu codes mentioned in the context.

  9. The family size N of both the random and Zadoff-Chu codes is generally much larger than the number of served users (K) in our system.

  10. The original experiments were conducted with a cell size about 200 m.

  11. The normalized channel estimation error is defined as

    , where m = 1,…,M, k = 1,…,K, and is the expectation.

  12. Since perfect channel estimation is assumed in Fig. 8, the pilot signal is completely cancelled from the received signal in (27).

  13. Since the other-cell relative interference factor is the received SIR reduction parameter which is independent of the number of antennas, we therefore use 100 antennas for simulation without loss of generality.

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Authors and Affiliations

  1. Department of Electrical and Computer Engineering, National Chiao Tung University, Taiwan, Republic of China

    Wei-Han Hsiao, Yung-Wen Shih & Chia-Chi Huang

Authors
  1. Wei-Han Hsiao
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  2. Yung-Wen Shih
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  3. Chia-Chi Huang
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Correspondence to Wei-Han Hsiao.

Additional information

The original version of this article was revised: Table 1, Footnote 11, and Equations 2, 4, 6, 21, 23, 24, 25, 29, 34, 36, and 38 were corrected.

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Hsiao, WH., Shih, YW. & Huang, CC. Case study and performance evaluation of MDMA–A non-orthogonal multiple access scheme for 5G cellular systems. Mobile Netw Appl 23, 1035–1048 (2018). https://doi.org/10.1007/s11036-017-0970-2

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