A realization method and device of OFDM dual modulation and demodulation mode

An implementation method and a technology of modulation and demodulation, which are applied in phase-modulated carrier systems, multi-frequency code systems, multi-carrier systems, etc., can solve problems such as increasing the complexity of system implementation, complicating implementation, and increasing hardware costs, achieving both flexibility Sex and practicability, easy hardware implementation, fast and free switching effect

Inactive Publication Date: 2017-08-08
ZHEJIANG UNIVIEW TECH CO LTD
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Problems solved by technology

If you choose a modulation method, you will lose flexibility because of the single modulation method
If multiple modulation methods are selected, it will inevitably increase the complexity of the system implementation, thereby greatly increasing the hardware cost
In fact, more modulation methods are redundant from a practical point of view, and from the perspective of hardware implementation, it will increase the processing difficulty, occupy more hardware resources and even increase the instability of the system
In addition, in terms of modulation and demodulation mode switching, the existing various modulation and demodulation modes need to obtain the bit error rate before switching, obtain the signal-to-noise ratio through the bit error rate, and then change the modulation mode. The implementation is more complicated, and there is no advantage in complexity and real-time performance

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  • A realization method and device of OFDM dual modulation and demodulation mode
  • A realization method and device of OFDM dual modulation and demodulation mode
  • A realization method and device of OFDM dual modulation and demodulation mode

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Embodiment Construction

[0040] A method for realizing an OFDM dual modulation and demodulation manner, comprising the following steps:

[0041] (1) The sender and receiver are initialized before communication.

[0042] Initialize the units related to the modulation and demodulation mode in the transmitting end and the receiving end (ie, the packet interleaving unit and the mapping unit at the transmitting end, and the demapping unit and the deinterleaving unit at the receiving end). After initialization, the two parties use the default modulation and demodulation method to communicate, and the communication starts. In this embodiment, the default modulation and demodulation mode is the QPSK mode.

[0043] (2) After the sender embeds two identical long training sequences before the data to be sent (that is, valid data), the original data is formed;

[0044] (3) The sender uses QPSK modulation to process the original data. The processing steps are processed according to the basic steps included in O...

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Abstract

The invention discloses a method and device for realizing OFDM dual modulation and demodulation mode, which calculates the signal-to-noise ratio quantization value SNR of received data through the receiving end quant , and the SNR quantization value SNR quant Compared with the preset threshold to determine the modulation and demodulation mode of the sending end and the receiving end. In the switching of the modulation and demodulation mode, the system does not need to calculate the bit error rate, and directly adopts the method of calculating the quantized value of the signal-to-noise ratio. This method adopts fewer calculation steps, simple hardware implementation, less overhead, and High flexibility.

Description

technical field [0001] The invention relates to the field of wireless communication systems, in particular to a method and device for realizing an OFDM dual modulation and demodulation mode. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing) is a high-efficiency communication technology solution, which is both a modulation technology and a multiplexing technology. OFDM has been closely watched since its inception and has now been adopted by 4G / B4G / 5G standards. At present, OFDM and its related technologies are still a research hotspot in academia. In the OFDM system, data can be modulated and demodulated by using different modulation and demodulation methods, such as classical BPSK, QPSK, 16QAM, 64QAM, 256QAM and other modulation and demodulation methods. This involves a method called adaptive modulation and demodulation. The main purpose of this method is to select a suitable modulation and demodulation mode for the communication system accord...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L27/34H04L27/18
Inventor 肖海林胡立坤许旻贺栋梁王成旭刘彩丽闫坤
Owner ZHEJIANG UNIVIEW TECH CO LTD
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