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Multi-user detecting method and device in wireless communication network

A multi-user detection and wireless network technology, applied in the field of wireless communication networks, can solve problems affecting uplink performance, not supporting long scrambling codes, incompatible with UMTS, etc., and achieve the effect of optimizing multi-user detection

Inactive Publication Date: 2008-07-30
ALCATEL LUCENT SHANGHAI BELL CO LTD
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AI Technical Summary

Problems solved by technology

The existing multi-user detection method based on long scrambling codes in UMTS is not ideal, which affects the performance of the uplink to a certain extent
[0003] In addition, the existing MUD (multi-user detection device 1) used in other systems cannot be introduced into the UMTS system due to their own problems:
[0004] 1. The MUD in the CDMA (Code Division Multiple Access) system is mainly based on spread spectrum and short scrambling codes. The problem is that the calculation complexity is high and long scrambling codes are not supported;
[0005] 2. The MUD in the IDMA (Interleaved Multiple Access) system is mainly based on the interleaver. The problem is that each user equipment (for the sake of brevity, "user equipment" will be referred to as "user" for short) must be assigned a unique length. An interleaver with thousands of chips is used for multi-user detection. In addition, IDMA is not compatible with UMTS and does not support multi-code transmission

Method used

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  • Multi-user detecting method and device in wireless communication network
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  • Multi-user detecting method and device in wireless communication network

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Embodiment Construction

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0026] In the following description, a user signal refers to a signal from a user. In addition, the concept of "signal" should be understood flexibly. It can be understood as information sent by the transmitting device b for communication between devices at both ends of the link Bit can also be understood as a superordinate concept that includes the above-mentioned information bits and other types of information (obtained based on the information bits), non-exclusively, it may include a priori and / or a posteriori logarithmic likelihood ratio.

[0027] Network Structure Description

[0028] figure 1 It is a schematic diagram of a wireless network according to a specific embodiment of the present invention. The wireless network (for example, UMTS network) includes multiple users I-IV (for example, mobile phones), and also includes a base station V. The multi-user d...

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Abstract

The invention provides a multi-user detection method and a device thereof in wireless network. Specifically, the adopted technical scheme of the invention is as follows: jointly detecting and processing an original signal on the basis of a first estimated value of user signals from each user in a receiving device; de-multiplexing a second estimated value obtained from the joint detection; multiplexing the second estimated value obtained from the de-multiplexing; and repeating the operation until the iteration is convergent or reaches set times. The invention accumulates precision estimated by Gauss during many times of iteration, thus providing a multi-user detection scheme superior to prior art and optimizing uplink performance.

Description

technical field [0001] The invention relates to a wireless communication network, in particular to multi-user detection in the wireless communication network. Background technique [0002] In UMTS (Universal Mobile Telecommunications System, based on W-CDMA technology, wideband code division multiple access), the capacity of the dedicated uplink channel is a bottleneck of the system, and how to improve the performance of the uplink has always been a subject of great concern. The existing multi-user detection method based on long scrambling codes in UMTS is not ideal, which affects the performance of the uplink to a certain extent. [0003] In addition, the existing MUD (multi-user detection device 1) used in other systems cannot be introduced into the UMTS system due to their own problems: [0004] 1. The MUD in the CDMA (Code Division Multiple Access) system is mainly based on spread spectrum and short scrambling codes. The problem is that the calculation complexity is hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/34H04B7/00H04Q7/38
Inventor 倪巍
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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