A Design Method of Millimeter-Wave Digital-Analog Hybrid Precoding Based on Geometric Structure
A digital-analog hybrid and geometric structure technology, applied in electrical components, radio transmission systems, transmission systems, etc., can solve problems such as high system complexity and achieve the effect of reducing hardware costs
Active Publication Date: 2020-04-24
SOUTHEAST UNIV
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[0005] In most of the existing hybrid precoding design methods, in order to obtain a suitable analog precoding vector, it is usually necessary to perform a greedy search on the codebook, and the size of the codebook usually increases exponentially with the number of system antennas and the number of phase quantization bits, so , large-scale search will inevitably lead to higher system complexity
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[0054] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.
[0055] like figure 1 As shown, in this implementation, the transmitter adopts a mixed digital and analog precoding structure, which mainly includes modules such as baseband signal processing, radio frequency link (digital-to-analog converter, up-converter), and analog phase shifter. The transmitter has N t = 64 transmit antennas, N RF = 2U radio frequency links, where U is the number of users at the receiving end. In this embodiment, only the precoding at the transmitting end is considered, so each user at the receiving end is only equipped with N r = 1 antenna. It should be noted that the precoding method proposed in the present invention is also applicable to a millimeter-wave system in which the user is equipped with multiple antennas or the receiving end adopts a hybrid architecture. Since the number of signal streams sent by the trans...
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The invention discloses a millimeter wave digital-analog hybrid pre-encoding design method based on geometric construction. The millimeter wave digital simulation hybrid pre-encoding design method is characterized by comprising the following steps: 1, calculating a pure digital pre-encoding matrix FD according to channel state information of a transmitting end antenna and a receiving end antenna; 2, performing matrix decomposition on the pure digital pre-encoding matrix FD to decompose the pure digital pre-encoding matrix FD into a product of an analog pre-encoding matrix FRF and a digital pre-encoding matrix RBB; 3, setting a coefficient fi(n) in the digital pre-encoding matrix RBB; 4, obtaining a nonlinear equation of an analog domain phase phi m, M+n of the i user: (the formula is as shown in the specification); and 5, solving the nonlinear equation to obtain an analog domain phase phi m, n, and then obtaining the analog pre-encoding matrix FRF. According to the method, the pre-encoding design problem is converted into a triangular construction problem of a complex plane from the geometric angle, thereby reducing the codeword search complexity (time complexity) of and computational complexity of the system, and effectively improving the spectrum efficiency of the system at the same time.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a millimeter wave digital-analog hybrid precoding design method based on geometric structure. Background technique [0002] With the continuous development of wireless communication technology, high-speed data services and ubiquitous access requirements are showing an explosive growth. The next-generation 5G mobile communication technology will have higher and higher demands on capacity, energy consumption and bandwidth. Studies have shown that the use of large-scale antenna arrays at the base station can bring various performance advantages such as system energy efficiency and spectrum utilization improvement. However, in the traditional microwave frequency band, a large number of antennas will lead to a larger size of the antenna that meets the isolation degree, which brings certain difficulties to the hardware implementation of the system. [0003]...
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IPC IPC(8): H04B7/0456
CPCH04B7/0456
Inventor 黄永明苏敏华章建军张铖
Owner SOUTHEAST UNIV