Symbol-level hybrid precoding method for massive MIMO

A precoding, symbol-level technology, applied in the field of symbol-level hybrid precoding for massive MIMO, to achieve the effect of improving system capacity

Active Publication Date: 2021-09-07
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

At present, there have been many studies on hybrid precoding technology, but they are mainly aimed at the minimum power problem under the signal-to-noise ratio constraint based on symbol-level hybrid precoding, or the minimum power problem under the QoS constraint based on linear precoding , there is no public literature that considers the bit error rate to perform a symbol-level hybrid precoding method

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  • Symbol-level hybrid precoding method for massive MIMO
  • Symbol-level hybrid precoding method for massive MIMO
  • Symbol-level hybrid precoding method for massive MIMO

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Embodiment Construction

[0061] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0062] In the embodiment, consider a downlink system of single-cell multiple-input multiple-output (MIMO), such as figure 1 shown, which contains a N T BS with root antenna, BS equipped with N R A radio frequency (RF) link serves K single-antenna user terminals. The present invention minimizes the maximum symbol error probability (SEP) of the user at the receiving end under the constraints of the transmitting signal power of the transmitter through the hybrid precoding design. Hybrid precoders consist of analog and digital precoders. Compared with digital precoding, analog precoder has constant modulus constraints and discrete phase constraints. In addition, the maximum change rate of its precoding weights may be difficult to match the digital precoder and reach the symbol-level change rate, so it is difficult for the analog...

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Abstract

The invention discloses a massive MIMO-oriented symbol-level hybrid precoding method. The method minimizes the maximum symbol error probability (SEP) of a user at a receiving end under the constraints of the transmitting signal power of a transmitter through hybrid precoding design. Aiming at the constant modulus constraint and discrete phase constraint in the hybrid precoder, the present invention realizes the hybrid precoding in two steps, first solving the full digital symbol level precoding (SLP) under the power constraint of the transmitted signal, and then minimizing the full digital symbol level The Euclidean distance between the precoder and the hybrid precoder to solve for the latter. Aiming at the problem of different encoding rates of analog and digital precoding devices, the present invention proposes a hybrid precoding scheme of multi-symbol analog and symbol-level digital matching. The hybrid precoding scheme proposed by the present invention meets the requirement of low bit error rate while improving system capacity, and has important guiding significance for the design of large-scale / ultra-large-scale MIMO communication systems.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a symbol-level hybrid precoding method oriented to massive MIMO. Background technique [0002] High reliability and low latency is a major wireless transmission scenario of 5G, and a specific manifestation of reliability is the low bit error rate of transmission. In traditional methods, multi-antenna precoding technology is often used at the transmitting end to improve the receiving signal-to-noise ratio at the receiving end, thereby increasing the system capacity. However, in such a highly reliable system, it is difficult to meet its requirements on the bit error rate. [0003] Multi-antenna precoding technology has great advantages in improving system capacity and system spectrum utilization. However, when the number of antennas at the base station (BS) side increases sharply, this technology also brings about the design complexity of the receiver a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0456
CPCH04B7/0465
Inventor 蔡曙尹秋阳王子竟张军郭永安
Owner NANJING UNIV OF POSTS & TELECOMM
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