A multi-user detecting method in CDMA communication system

A multi-user detection and wireless communication system technology, which is applied in the field of uplink multi-user detection, can solve problems such as MMSE algorithm and system performance loss, and achieve the effects of reducing implementation costs, simplifying complexity, and improving system capacity

Inactive Publication Date: 2005-01-19
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Both techniques will bring loss to the performance of the system, and no MMSE algorithm is involved

Method used

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  • A multi-user detecting method in CDMA communication system
  • A multi-user detecting method in CDMA communication system
  • A multi-user detecting method in CDMA communication system

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Embodiment Construction

[0030] For the convenience of drawing, so that those skilled in the art can understand and implement the present invention, some symbols, usage and terms to be used in the description of this specification are defined as follows:

[0031] Bold italic capital letters indicate matrices;

[0032] Bold italic lowercase letters denote column vectors;

[0033] Thin italic capital letters indicate integers;

[0034] Thin italic lowercase letters denote plurals;

[0035] e: constant, the value is 2.71828...;

[0036] π. Constant, the value is 3.14159...;

[0037] j: unit imaginary number, j 2 =-1;

[0038] Q: spreading factor;

[0039] K: number of users;

[0040] M: number of antennas;

[0041] N: number of symbols per user;

[0042] W: the length of the channel impulse response sequence;

[0043] k: user serial number, value range 0...K-1;

[0044] m: Antenna serial number, value range 0...M-1;

[0045] n: symbol number, value range 0...N-1;

[0046] (k, m): Indicates t...

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Abstract

The invention discloses a multiuser detecting method in CDMA communication system, using DFT (Discrete Fourier Test) to realize multiuser detection. It makes multiuser detection in frequency domain, realizes decoupling of each frequency component and simplifies the algorithm complexity. On the conditions of relatively small time delay extension of channel, frequency domain related matrix and matching filtering operation is realized in time domain, avoiding large amount of DFT operation. It uses the relativity between frequency domain related matrixes to realize a compromise between complexity and property and further simplifying the complexity.

Description

technical field [0001] The invention relates to the field of communication, in particular to an uplink multi-user detection method implemented in a fading channel by using fast Fourier transform in a Code Division Multiple Access (CDMA) communication system. Background technique [0002] In a CDMA communication system, multiple users use pre-allocated codewords to implement access on one carrier frequency at the same time. CDMA was first used in military communications to avoid interception by enemy stations and interference with one's own signals. The earliest commercial CDMA communication technology was introduced by Qualcomm (QUALCOMM) in 1995, and CDMA has become the mainstream multiple access technology of the third generation mobile communication. In the design of CDMA systems, many systems use orthogonal sequences as spreading codes. However, in mobile environments, intersymbol interference (ISI) and multiple access interference (MAI) will occur due to the influence ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04B7/26H04L25/03
Inventor 杨学志
Owner HUAWEI TECH CO LTD
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