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Power windowing sending method applicable to UFMC (universal filtered multicarrier) waveforms

A transmission method and power technology, which is applied in the modulation carrier system, the shaping network in the transmitter/receiver, and the baseband system, etc., can solve the problems of capacity degradation, improve the bit error performance, and improve the resistance to time-frequency offset Capability, the effect of reducing inter-symbol interference

Active Publication Date: 2017-05-31
上海瀚芯实业发展合伙企业(有限合伙)
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Problems solved by technology

However, since UFMC does not use a cyclic prefix (CP), it will generate inter-symbol interference (ISI) in the multipath channel, which will lead to a decline in its ability to resist time-frequency offset during demodulation.

Method used

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  • Power windowing sending method applicable to UFMC (universal filtered multicarrier) waveforms
  • Power windowing sending method applicable to UFMC (universal filtered multicarrier) waveforms
  • Power windowing sending method applicable to UFMC (universal filtered multicarrier) waveforms

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Embodiment Construction

[0020] The present invention will be further explained below in conjunction with the accompanying drawings.

[0021] Suppose a UFMC system contains N subcarriers, which are divided into M subbands (Subband), and the mth subband is composed of N m adjacent subcarriers. Use U=[0,1,...,N-1] to represent the set of subcarrier positions, then Indicates the subcarrier position contained in the mth subband, and N 0 +N 1 +… N M-1 =N. According to system settings, the M subbands can be allocated to the same user, or can be allocated to different users. The following assumes that they are assigned to the same user, and the situation of different users can be deduced by analogy.

[0022] Assume that after signal modulation, the symbol vector generated by the user is S=[S(0),S(1),...,S(N-1)] T , where S(i) represents a QPSK or QAM modulated symbol, i=0,1,...,N-1. The sending end divides S into M non-overlapping sub-symbol vectors, which are respectively configured for transmissio...

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Abstract

The invention discloses a power windowing sending method applicable to UFMC (universal filtered multicarrier) waveforms. The method includes: firstly, a sending end sets sub-bands requiring filtering in a frequency domain according to system requirements, wherein the sub-bands are formed by adjacent sub-carriers; secondly, each sub-band is subjected to N-point Fourier inverse transformation to a time domain; thirdly, the sending end multiplies power of a time domain signal of each sub-band by a window function being N in length; finally, generated signals are processed by a filter to form UFMC baseband signals which are modulated to a carrier frequency prior to being sent.

Description

technical field [0001] The invention relates to a power windowing transmission method suitable for UFMC waveforms, belonging to the field of signal processing in mobile communication systems. Background technique [0002] In mobile communication systems, waveform has always been one of the main components in air interface technology. The current commercial fourth-generation mobile communication system (4G) adopts cyclic prefix-based orthogonal frequency division multiple access (CP-OFDM) technology as its air transmission waveform. The CP-OFDM technology has the advantages of high transmission efficiency, simple implementation, and easy combination with multiple-input multiple-output (MIMO). However, its orthogonal structure determines that it is very sensitive to timing offset (Timing offset) and frequency offset (Carrierfrequency offset). At the same time, because CP-OFDM adopts rectangular window truncation in the time domain processing, there is a high out-of-band leak...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L25/03
CPCH04L25/03012H04L27/2628H04L27/264
Inventor 盛彬刘恒张辉吴琼刘媛美
Owner 上海瀚芯实业发展合伙企业(有限合伙)
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