Upstream multiple access method combined with orthogonal multiple access and nonorthogonal multiple access

A technology of non-orthogonal multiple access and access method, which is applied in the field of multiple access for digital information transmission, and can solve the problems that IDMA is not suitable for asymmetric channels and the overall transmission rate of the system is not high.

Active Publication Date: 2015-08-26
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although IDMA can significantly increase the number of simultaneous access users of the system, its iterative multiuser detection method relies on the approximation of the maximum likelihood multiuser detection method at low SNR, which is not suitable for medium and high SNR scenarios. In a sense, the maximum rate of a single user is limited, and the overall transmission rate of the system is not high
More importantly, IDMA is not suitable for asymmetric channels, especially channels with very different signal-to-noise ratios for different users

Method used

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  • Upstream multiple access method combined with orthogonal multiple access and nonorthogonal multiple access
  • Upstream multiple access method combined with orthogonal multiple access and nonorthogonal multiple access
  • Upstream multiple access method combined with orthogonal multiple access and nonorthogonal multiple access

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Embodiment 1

[0081] In this embodiment, taking K=27 as an example, the multiple access method of the present invention is further described in detail. The specific process is as follows Figure 4 As shown, it specifically includes the following steps:

[0082] Step 1: The base station orthogonally divides the bandwidth resources of the multiple access channel according to the channel state information and service requirements of the 27 users within the coverage area, and obtains three orthogonal sub-channels of the multiple access channel.

[0083] Wherein, the user service requirement includes but not limited to the user transmission rate. The channel state information includes user transmit power, channel gain, and receiver noise, or channel gain and user signal-to-noise ratio at the receiver. More specifically, the bandwidth resource of each orthogonal subchannel is a part or all of the time domain, frequency domain, air domain or code domain resources of the entire multiple access cha...

Embodiment 2

[0103] This embodiment takes K=9 (that is, 9 users) as an example to further describe the multiple access method of the present invention in detail. This embodiment is similar to Embodiment 1, and its difference only lies in the following content:

[0104] 1. The number of users in the multiple access channel is K=9.

[0105] 2. Divide the bandwidth resource of the multiple access channel to obtain only one orthogonal sub-channel.

[0106] 3. Divide the power resource of the multiple access channel to obtain 3 sub-layer channels, the 3 sub-layer channels have different priorities, and each sub-layer channel is shared by 3 users.

[0107] 4. Each user only accesses one sub-layer channel of one orthogonal sub-channel.

[0108] 5. The resource occupancy of the equivalent multiple access channel is as follows: Figure 7 shown.

Embodiment 3

[0110] In this embodiment, 9 users are taken as an example to further specifically describe the multiple access method of the present invention. This embodiment is similar to Embodiment 1, and its difference only lies in the following content:

[0111] 1. The number of users in the multiple access channel is K=9.

[0112] 2. Divide the bandwidth resource of the multiple access channel to obtain three orthogonal sub-channels.

[0113] 3. Perform non-orthogonal segmentation on each orthogonal sub-channel to obtain 3 sub-layer channels, the 3 sub-layer channels have different priorities, and each sub-layer channel is only accessed by 1 user.

[0114] 4. Each user only accesses one sub-layer channel of one orthogonal sub-channel.

[0115] 5. The resource occupancy of the equivalent multiple access channel is as follows: Figure 8 shown.

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Abstract

The invention provides an upstream multiple access method combined with orthogonal multiple access and nonorthogonal multiple access, comprising the steps as follows: a base station performing orthogonal partition to a band width resource of a multiple access channel according to channel state information and business requirement of K users in the coverage range thereof to obtain L orthogonal sub-channels of the multiple access channel; performing nonorthogonal partition to each orthogonal sub-channel to obtain one or a plurality of sub-layer channels, the base station determining a transmission mode of each user according to channel state information, business requirement, bandwidth and power resource partitioning condition of the multiple access channel of K users in the coverage range thereof and respectively and correspondingly transmitting to each user; performing coded modulation to information bits of the transmission mode by each user to obtain a transmitting signal with the information bits, and outputting to the multiple access channel. The upstream multiple access method combined with orthogonal multiple access and nonorthogonal multiple access of the invention reduces distance of multi-user united reachable rate upper bound and theoretical cycle, and reduces receiving delay and improves error spread to reduce realizing complexity.

Description

technical field [0001] The invention relates to the technical field of multiple access for digital information transmission, in particular to an uplink multiple access method combining orthogonal multiple access and non-orthogonal multiple access. Background technique [0002] In a typical wireless / mobile digital communication system, the base station needs to communicate with multiple users within the coverage area, and the downlink multiple access problem has been solved to a large extent. As for the issue of uplink multiple access (referred to as multiple access), there are still many problems to be solved urgently, for example, there are large-scale asymmetric uplink multiple access users in a cellular mobile communication system. Network information theory points out that for multiple access, the total transmission rate of the system can be maximized by using superposition coding (SC) technology, but at this time, multiple user signals interfere with each other. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L1/00
CPCH04L1/0009H04L1/0071H04L1/0076H04L27/2601
Inventor 彭克武金黄平陈霜宋健
Owner TSINGHUA UNIV
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