Improved Port Modulation for Multiuser Massive MIMO Systems

Improved Port Modulation for Multiuser Massive MIMO Systems

Yujiao He (National Mobile Communications Research Laboratory, Southeast University, Nanjing, China), Jianing Zhao (National Mobile Communications Research Laboratory, Southeast University, Nanjing, China), Lijuan Tao (National Mobile Communications Research Laboratory, Southeast University, Nanjing, China), Fuyu Hou (National Mobile Communications Research Laboratory, Southeast University, Nanjing, China) and Wei Jia (National Mobile Communications Research Laboratory, Southeast University, Nanjing, China)
DOI: 10.4018/IJITN.2015100102
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Abstract

This paper proposes an improved port modulation (PM) method which can be applied to the multiuser (MU) massive multiple-input multiple-output (MIMO) system. The precoding process of the improved PM can be divided into two parts: port precoding and MU precoding. The methods of the precoding and detection are provided and the performance of the proposed improved PM is simulated and analyzed. Simulation results show that the proposed improved PM system can achieve a satisfying bit error rate (BER) performance with a cutdown channel state information (CSI) feedback.
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System Description

The Basic Port Modulation System Model

Noh, Kim, Lee, J. and Lee, C. (2015) show the codebook design of a point-to-point PM system. Noh et al. consider a Nt×Nr MIMO system showed in Figure 1, which is referred as the basic PM and the proposed PM method is referred as the improved PM in this paper.

Figure 1.

Basic PM system model

The received signal y in Figure 1 can be descripted as

(1) where Heff = HF is the effective channel matrix, is the channel matrix, is the PM precoding matrix, P is the number of the ports, and is the additive white Gaussian noise (AWGN) vector with independent identically distributed (i.i.d) entries according to the zero mean complex Gaussian distribution with variance N0, i.e. . The transmit symbol sk is defined by
(2) where ρ is the transmit power and sk is a P×1 column vector. It is clear that the information bits are conveyed only on the ports in the basic PM system, which means that the basic PM can be regarded as the combination of space-shift keying and precoding. So the spectral efficiency R of the basic PM system showed in (3) is decided only by the number of the ports.

(3)

Noh, Kim, Lee, J. and Lee, C. (2015) also show that the destination of the PM precoding in FDD Massive MIMO systems is adjusting the precoding matrix F to make PM robust to the spatial correlation and the per antenna power constraint. In other words, the basic PM accomplishes the mapping from the logical antennas to the antenna ports by the precoding process.

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