Demodulation method for multi-user mapping signal

A multi-user, signal modulation technology, applied in the field of demodulation of multi-user mapping signals, can solve problems such as no longer applicable, inconsistent receiving algorithms, signal demodulation errors, etc., and achieve the effect of improving accuracy and strong independence

Active Publication Date: 2007-02-14
HUAWEI TECH CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

If the demodulation of user 1 is wrong, the signal demodulation of user 2 will also be wrong, thereby reducing the accuracy of signal demodulation
[0019] (2) When demodulating the received signal, user 1 and user 2 need to use different demodulation methods, resulting in inconsistent receiving algorithms for different users
[0020] In addition, for other multi-user mapping methods, if there is no independent constellation diagram for a single user, this method will no longer be applicable

Method used

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Embodiment 1

[0045] In this embodiment, the transmitting end uses the superposition method to perform multi-user mapping, and the receiving end of each user included in the multi-user mapping pre-stores a multi-user superposition modulation algorithm for demodulation of received signals. The multi-user superposition modulation algorithm refers to figure 1 The algorithm used during the modulation.

[0046]Assuming that the multi-user mapping contains two users, namely user 1 and user 2, the specific demodulation process is as follows Figure 4 Shown:

[0047] Step 401. After obtaining the modulation parameter information sent by the transmitter through the control channel, the receiver of each user generates a multi-user mapping constellation table of the transmitter according to the received modulation parameter information and the pre-stored multi-user superposition modulation algorithm.

[0048] In this step, the modulation parameter information sent by the transmitting end includes: b...

Embodiment 2

[0070] The applicant also proposed a method for multi-user joint mapping, the multi-user joint mapping method is as follows Figure 5 As shown, the information bits of two or more users are jointly mapped, and the data symbols corresponding to the optimally designed constellation diagrams are output. Different from the multi-user superposition mapping method, the above-mentioned multi-user joint mapping method maps the information bits of two or more users as a whole, so only one-step mapping operation is required.

[0071] Assuming that there are two users in the multi-user joint mapping, user 1 has two information bits, and user 2 has one information bit, then the constellation diagram generated by the multi-user joint mapping algorithm is as follows: Figure 6 As shown, eight constellation points are included, namely 000, 001, 100, 101, 111, 110, 011 and 010.

[0072] Figure 6 The constellation shown is designed according to the following rules:

[0073] 1) The constell...

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Abstract

This invention discloses a demodulation method for multi-user mapping signals including: the transmission end transmits modulation parameter information and multi-user mapping signal to the receiving end of each user contained in the multi-user map to generate a constellation mapping list based on the information and a preserved multi-user signal modulation method, the receiving end in the map decides the constellation point nearest to the multi-user mapping signal based on the constellation mapping list and selects the information bit occupied by it from the information bit corresponding to the dot, which is used in the cellular system based on OFDM and multi-user multiplex to provide a general demodulation method for multi-user mapping.

Description

technical field [0001] The invention relates to a signal demodulation method in a cellular communication system, in particular to a multi-user mapping signal demodulation method. Background technique [0002] The downlink of the cellular communication system adopts a point-to-multipoint broadcast channel model. The signals of multiple users are multiplexed at the transmitter and then transmitted. This multiplexing is generally realized by orthogonal multiplexing, such as time-frequency multiplexing technology, etc. . However, the spectral efficiency of the orthogonal multiplexing system is easily affected by users with low SNR. The more users with low SNR in the system, or the higher the data rate required by users with low SNR, the lower the spectral efficiency of the entire system. lower. [0003] In order to overcome the above problems, a non-orthogonal multiplexing technology is proposed, that is, the information bits of two or more users are mapped to the same data sy...

Claims

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Application Information

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IPC IPC(8): H04L5/12H04L27/00H04Q7/22
Inventor 王艺
Owner HUAWEI TECH CO LTD
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