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A device and method for measuring error vector magnitude

A technology for measuring errors and vectors, applied in the field of devices for measuring error vector magnitude (EVM), can solve problems such as affecting processing flow, increasing business load, occupying devices, etc., to achieve the effect of reducing storage space and complexity

Inactive Publication Date: 2016-10-26
POTEVIO INFORMATION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0023] Using device 2, when performing multi-band, multi-carrier system, such as Orthogonal Frequency Division Multiplexing (OFDM) test, the business load will increase significantly. At this time, the method of pre-stored data will occupy more storage space of the device, and then Affect normal processing flow

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  • A device and method for measuring error vector magnitude
  • A device and method for measuring error vector magnitude
  • A device and method for measuring error vector magnitude

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Embodiment Construction

[0044] In order to make the object, technical solution and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0045] In the embodiment of the present invention, when the signal-to-noise ratio reaches the maximum value of the system, hard decisions can be used instead of decoding and encoding, thereby reducing the computational complexity. In addition, since pre-stored data is no longer required, data storage space is reduced.

[0046] The EVM measurement scenario of the current system adopts the indoor wired test method, and the terminal sends signals at the maximum power. What is reached at this time is the theoretical upper limit of the system performance.

[0047] In this scenario, the impact of noise is very small, and the signal-to-noise ratio reaches the maximum value of the system. At this time, the gain brought by channel coding becom...

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Abstract

A device for measuring the magnitude of an error vector, when the signal-to-noise ratio reaches the maximum value of the system, the device includes: a receiving data generation module that generates constellation data; a constellation demodulation module that demodulates the constellation data to obtain soft bit information; a hard decision module , make hard decisions based on soft bit information to restore the transmitted coded data; the constellation modulation module modulates the transmitted coded data sent by the hard decision module to the corresponding constellation symbols to generate transmitted constellation data; the measurement error vector magnitude EVM calculation module, according to the constellation data and transmit constellation data to generate and output EVM measurements. The invention also discloses a method for measuring the magnitude of the error vector. After applying the embodiment of the present invention, the calculation complexity and data storage space can be reduced.

Description

technical field [0001] The present application relates to the field of communication technologies, and more specifically, to an apparatus and method for measuring error vector magnitude (EVM). Background technique [0002] At present, the physical layer signal of the power communication system adopts the quadrature amplitude modulation technology, and EVM is an important measurement index of the system based on this technology. [0003] Take the uplink single-subband traffic channel as an example. Currently, the uplink traffic channel with 25 ms as a scheduling unit has 23 time symbols, and each time symbol occupies 10 frequency subcarriers. The 3 time symbols occupied by the pilot are removed. The uplink traffic channel It can carry 20*10=200 quadrature amplitude modulation symbols within 25ms. [0004] Each QAM symbol satisfies the standard constellation mapping table (QPSK / 16QAM / 64QAM). EVM is the vector difference between the transmitted signal and the received signal....

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/00H04L27/38
Inventor 秦琦王单
Owner POTEVIO INFORMATION TECH CO LTD