CN-122026977-A - Multi-user uplink oriented hierarchical resource shrinkage type fluid antenna multiple access method

CN122026977ACN 122026977 ACN122026977 ACN 122026977ACN-122026977-A

Abstract

The invention discloses a multi-user uplink oriented hierarchical resource shrinkage type fluid antenna multiple access method, which comprises the steps of establishing a receiving device for configuring M fluid antennas and an uplink communication system model of M single-antenna users, sharing the same time frequency resource, determining a user processing sequence based on path loss by the receiving device, initializing an optional antenna-port resource pool, sequentially selecting an antenna-port with the largest signal-to-interference-noise ratio for the user according to the sequence, then removing all ports of the antenna from the resource pool to realize resource hierarchical shrinkage, simultaneously transmitting signals by the user after all ports are determined, sequentially decoding and executing serial interference elimination by the receiving device, and finally calculating a system and a rate.

Inventors

ZHANG ZHENHAO
XU YAO
Mao Zijie
ZHOU SHUHAO
ZHU JIANYUE
ZHANG ZHIZHONG

Assignees

南京信息工程大学

Dates

Publication Date: 20260512
Application Date: 20260413

Claims (10)

1. The multi-user uplink oriented hierarchical resource shrinkage type fluid antenna multiple access method is characterized by comprising the following steps of: Establishing an uplink communication system model, wherein the system model comprises a receiving device and M user devices, the M user devices share the same time-frequency resource to send uplink signals to the receiving device, the receiving device is configured with M fluid antennas, and each fluid antenna is provided with N selectable ports; The receiving equipment obtains the path loss from each user equipment to the receiving equipment and the channel coefficient from each user equipment to each port of each fluid antenna through channel estimation; the receiving equipment determines the processing sequence of each user equipment according to the sequence from the small path loss value to the large path loss value based on the path loss; Initializing a set of user equipment to be determined as all M user equipment, and initializing an optional antenna-port resource pool as all ports of all fluid antennas; the receiving equipment sequentially determines receiving antenna-ports corresponding to all user equipment according to the processing sequence, wherein for the user equipment in the current processing sequence, signals of other user equipment which does not determine the receiving ports are used as interference in a current selectable antenna-port resource pool, the signal to interference and noise ratio on each selectable port is calculated, and the antenna-port with the largest signal to interference and noise ratio is selected as the receiving antenna-port of the user equipment; After the determination of the receiving antenna-ports of all the user equipment is completed, all the user equipment simultaneously transmits self uplink signals to the receiving equipment, and the receiving equipment obtains receiving signals at the receiving antenna-ports of all the fluid antennas; the receiving equipment decodes the uplink signals of all the user equipment in turn according to the processing sequence, and executes serial interference elimination on the decoded uplink signals of the user equipment until the decoding of all the user equipment is completed; After all user equipment is decoded, the reachable rate of each user equipment is calculated based on the signal-to-interference-and-noise ratio of each user equipment in the corresponding decoding stage, and the reachable rates of all user equipment are summed to obtain a system and a rate so as to complete the multiple access of the multi-user uplink signal.
2. The method of claim 1, wherein the user devices are each equipped with a fixed single antenna, and wherein there is a port correlation between different selectable ports within the same fluid antenna, the port correlation being defined by a port correlation parameter Characterization, and the port-related parameters The method meets the following conditions: Wherein, the method comprises the steps of, For the normalized length parameter of each fluid antenna, the port correlation is only used for characterizing the correlation degree between different ports inside the same fluid antenna, and the correlation between different fluid antennas is not considered.
3. The method of claim 1, wherein the channel coefficients are described by a quasi-static flat rayleigh fading model and satisfy complex gaussian normalization of unit average power, and the noise at the receiving end of the receiving device is additive gaussian white noise and the noise power is normalized to 1.
4. The method of claim 1, wherein the path loss is determined by a distance between the user device and the receiving device and a path loss model based on the distance, the path loss model being: Wherein, the method comprises the steps of, Representing an index of the user equipment, Represent the first The distance between the individual user devices and the receiving device, For the reference distance to be a reference distance, Is the path loss index.
5. The method of claim 1, wherein the selectable antenna-port resources Chi Chushi are: Wherein, the method comprises the steps of, For the pool of selectable antenna-port resources, Representing the receiving device Index of the root fluid antenna(s), Representing the first of the fluid antennas An index of the one of the selectable ports, Representing an antenna-port; and each fluid antenna is assigned to at most one user device.
6. The method of claim 1, wherein, in determining the corresponding receive antenna-port for each user device, for the user devices in the current processing order Its antenna-port in the current selectable antenna-port resource pool The signal-to-interference-plus-noise ratio is calculated according to the following formula: Wherein, the method comprises the steps of, Indicating that the processing order is the first The user equipment index of the bit, ; Representing the transmitted signal-to-noise ratio; Representing user equipment To antenna-port The equivalent channel coefficients of (2) are jointly determined by the path loss and the channel coefficients; an index set representing all user devices; As disturbance indicating variable, when Time-indicating user equipment The signal of (2) is counted as an interference term in the current calculation The time indicates that the interference item is not counted, and the interference indication variable is taken from all user equipment during initialization And the corresponding interference indication variable is set to 0 after the user equipment completes the receiving antenna-port determination.
7. The method of claim 6, wherein the equivalent channel coefficients By path loss Sum channel coefficient Together, the expression is: Wherein, the method comprises the steps of, Representing an index of the user equipment, Representing the receiving device Index of the root fluid antenna(s), Representing the first of the fluid antennas An index of the one of the selectable ports, Represent the first Path loss from individual user devices to receiving devices, Represent the first Individual user equipment to antenna-port Is set, and channel coefficients of the same are set.
8. The method of claim 6, wherein the transmit signal-to-noise ratio Transmit power by user equipment And noise power determination, wherein the noise power is normalized to 1, then And the transmitting power of each user equipment is the same.
9. The method of claim 1 wherein the serial interference cancellation comprises, for a ue with a first processing order, decoding the received signal corresponding to its receiving antenna-port directly, regarding other un-decoded ue uplink signals as interference during decoding, for a ue with a subsequent processing order, subtracting all decoded ue uplink signals from the received signal corresponding to its receiving antenna-port, regarding the remaining un-decoded ue uplink signals as interference, and then decoding, wherein, after each successful decoding of a ue, the uplink signal corresponding to the ue is completely cancelled from the received signal in a subsequent decoding stage.
10. The method of claim 1, wherein the achievable rate of the user device is calculated according to shannon's capacity formula: Wherein, the method comprises the steps of, Representing user equipment Signal-to-interference-and-noise ratio in the serial interference cancellation decoding stage; the system and rate Sum of achievable rates for all user equipments 。

Description

Multi-user uplink oriented hierarchical resource shrinkage type fluid antenna multiple access method Technical Field The invention belongs to the technical field of wireless communication, and particularly relates to a multi-user uplink oriented hierarchical resource shrinkage type fluid antenna multiple access method. Background With the rapid development of mobile communication and various terminal applications, the uplink is facing the urgent need to simultaneously serve more user equipments under limited time-frequency resources. Currently, emerging services such as mass internet of things terminals, high-definition video live broadcasting, industrial data acquisition and the like are emerging, so that the number of uplink access users is increased explosively. Under the traditional multiple access framework, the contradiction between the limited time-frequency resources and the increasing number of access users is increasingly prominent, and how to effectively improve the system capacity and ensure the user service quality under the condition of limited resources becomes an important research direction in the field of wireless communication. To address the above challenges, the prior art has developed research primarily from two directions. On the one hand, the non-orthogonal multiple access technology is widely studied, and the core idea is that a plurality of user signals are superposed on the same resource, and user data are sequentially decoded at a receiving end through serial interference elimination, so that the limitation of orthogonal resources is broken through, and the system access capability is improved. On the other hand, the fluid antenna technology provides a flexible port switching mechanism for the receiving end, namely, a single antenna can configure a plurality of switchable ports, and the link quality is improved by selecting a better receiving position. In practical application, the prior method generally combines the two methods, namely, firstly selecting among a plurality of ports of a single fluid antenna, selecting the port with the optimal receiving effect, and then decoding the overlapped multi-user signals by utilizing serial interference cancellation so as to improve the overall receiving performance of the system under the condition of limited resources. However, the prior art solutions still have significant drawbacks in practical applications. First, the range of port selection is limited to the interior of a single antenna, failing to fully utilize the overall gain of multiple fluid antennas on the receiving device side, resulting in a non-optimal port selection from a global perspective. Secondly, the port selection result and the processing sequence of the subsequent serial interference elimination lack of a collaborative design, so that part of user equipment still suffers from stronger interference in a decoding stage, and stable and reliable decoding performance is difficult to ensure. The local and split type optimization mode makes the system and the rate increase limited, has large performance fluctuation, and is difficult to effectively cope with the same-frequency interference challenges in the multi-user uplink scene. Disclosure of Invention The invention aims to provide a multi-user uplink oriented hierarchical resource shrinkage type fluid antenna multiple access method, which aims to overcome the defects that in the prior art, port selection is limited to the inside of a single antenna, global gain is insufficient and decoding performance is unstable due to lack of cooperation with interference elimination, and the multi-antenna global gain is maximized, and the system, the speed and the access performance are improved by determining a strategy through the combination of the hierarchical resource shrinkage type antenna and the port and optimizing the combination with serial interference elimination. The technical scheme is that the multi-user uplink oriented hierarchical resource shrinkage type fluid antenna multiple access method comprises the following steps: Establishing an uplink communication system model, wherein the system model comprises a receiving device and M user devices, the M user devices share the same time-frequency resource to send uplink signals to the receiving device, the receiving device is configured with M fluid antennas, and each fluid antenna is provided with N selectable ports; The receiving equipment obtains the path loss from each user equipment to the receiving equipment and the channel coefficient from each user equipment to each port of each fluid antenna through channel estimation; the receiving equipment determines the processing sequence of each user equipment according to the sequence from the small path loss value to the large path loss value based on the path loss; Initializing a set of user equipment to be determined as all M user equipment, and initializing an optional antenna-port resource pool as all ports of all f