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Demodulation method and device

A demodulation method and a technology of a business group, applied in the field of demodulation methods and devices, can solve problems such as business data demodulation errors, waste of network resources, and limited effects, and achieve the effects of improving demodulation performance and throughput

Active Publication Date: 2011-11-23
ZTE CORP
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] During the demodulation process, even if a 1-bit error occurs, the terminal will consider the entire frame to be an error and needs to be resent by the network side. If multiple errors occur during the demodulation process, multiple resends will be required, resulting in a waste of network resources. , at present, the demodulation performance can be improved by improving the coding matrix, but the effect is limited. When the service data received by the terminal is interfered and the interference type is different, the demodulation performance of the terminal will drop very quickly, resulting in Demodulation error, this problem is currently more serious

Method used

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application example 1

[0045] The demodulation method of this embodiment is described below by taking the MIMO system of two transmissions and two receptions as an example. According to the protocol, the service symbols containing pilots are recorded as type B symbols, and the service symbols without pilots are recorded as type A symbols. Such as image 3 As shown, the method includes the following steps:

[0046] 301: The terminal divides the REs on the service symbols of the baseband frequency domain signal into four groups;

[0047] Such as figure 2 As shown, the service REs numbered 3 and 0 on the pilot symbols in the service symbols are the REs occupied by the pilot of the serving cell of the terminal (referred to as the current cell). When these REs are interfered, the interference comes from the same neighbor cell and the interference type is the pilot or service interference of neighboring cells, the REs with these two numbers are divided into one group, which is recorded as group 0, and ...

application example 2

[0065] Take the MIMO system with two transmissions and two receptions as an example. Figure 4 Another example of this embodiment will be described, including:

[0066] 401: The terminal divides the REs on the service symbols of the baseband frequency domain signal into seven groups;

[0067] Assuming that there is only one transmitting antenna in the adjacent cell, and the adjacent pilot REs on the same pilot symbol are separated by five subcarriers, the pilot interference of the adjacent cell pilots on the two transmitting antennas of this cell cannot come from the same adjacent cell. cell, therefore, the pilots on the two transmitting antennas of the cell are divided into two groups, which are pilot groups, such as figure 2 As shown, the REs with the same number i on the pilot symbols are divided into group i; the service REs on the non-pilot symbols are group 6, where group 1, group 2, group 4, group 5 and group 6 are denoted as business group.

[0068] 402: Calculate ...

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Abstract

The invention discloses a demodulation method and device. The method comprises the following steps: grouping service REs in resource elements (REs) on service signs in baseband frequency domain signals by a terminal to form service groups, calculating interference-reducing factors corresponding to each service group, multiplying estimated values of baseband frequency domain signals and / or signal channels corresponding to each service group by the interference-reducing factor corresponding to the service group, and demodulating the estimated values of baseband frequency domain signals and / or signal channels. According to the invention, the REs (resource element) on the service signs are grouped according to interference sources and interference types to mark the service RE-containing groups as service groups, the estimated values of baseband frequency domain signals and / or signal channels on REs in the corresponding service groups are multiplied by interference-reducing factors respectively, and the demodulation is performed by using the estimated values of baseband frequency domain signals and / or signal channels after interference reduction. The method and device disclosed by the invention can effectively improve the demodulation performance when service data is subjected to the interference of neighborhood areas, so as to improve the throughput of a system.

Description

technical field [0001] The present invention relates to the technical field of Orthogonal Frequency Division Multiplexing (OFDM), in particular to a demodulation method and device. Background technique [0002] For wireless communication systems, the transmission mode can be SIMO (Single Input Multiple Output, single input multiple output), SIMO is a form of smart antenna technology for wireless communication, using a single antenna to send signals on the transmitter, Multiple antennas receive signals on the receiver, and it can also be MIMO (Multi-input Multi-output, multiple input multiple output). MIMO is an abstract mathematical model used to describe a multi-antenna wireless communication system. It can Use multiple antennas at the transmitting end to send signals independently, and at the same time use multiple antennas at the receiving end to receive and restore the original information. Existing MIMO systems are mainly divided into two modes: transmit diversity and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L25/03993H04L25/03159H04B1/1027H04L2025/03414
Inventor 陈琼余秋星张文忠
Owner ZTE CORP