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Signal transmission method based on binary phase shift keying modulation and orthogonal frequency division multiplexing

A phase shift keying and quadrature frequency division technology, applied in the field of communication, can solve the problem of inability to guarantee signal transmission performance, and achieve the effects of reducing demodulation error rate, improving reception signal-to-noise ratio, and low transmission error rate performance

Inactive Publication Date: 2018-12-21
ZHUHAI ZHONGHUI MICROELECTRONICS
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Problems solved by technology

[0004] Due to the power limitation of the digital communication system, when the channel transmission conditions are bad, even if the sending end adopts the lowest-order BPSK+OFDM modulation technology with better performance, the error rate of the information transmission process may still be higher than the required index of the communication system. Good signal transmission performance cannot be guaranteed

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  • Signal transmission method based on binary phase shift keying modulation and orthogonal frequency division multiplexing
  • Signal transmission method based on binary phase shift keying modulation and orthogonal frequency division multiplexing
  • Signal transmission method based on binary phase shift keying modulation and orthogonal frequency division multiplexing

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[0037] In order to make the above and other objects, features and advantages of the present invention more apparent, the following specifically cites the embodiments of the present invention, together with the accompanying drawings, for a detailed description as follows.

[0038] figure 2 Be the flow chart of the inventive method, below in conjunction with figure 2As shown, the method of the present invention is further described. The signal transmission method of the present invention is divided into two stages: a signal sending stage and a signal receiving stage, and the steps of the signal sending stage are as follows:

[0039] S1-1, carry out BPSK constellation mapping to N binary digital bit sequences, obtain the mapping sequence A=[a 1 ,a 2 ,...,a n ,...,a N ], where a n =1 / -1, n=1,2,...,N, N is the number of subcarriers in the communication system, every N binary digital bit sequences generate 1 OFDM symbol, N can be divisible by 8, and its value is an exponent of...

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Abstract

A signal transmission method based on binary phase shift keying modulation and orthogonal frequency division multiplexing technology. The conventional bpsk signals on the frequency domain subcarriersare grouped, each packet signal is transformed into a new packet signal containing two consecutive zero signals and six BPSK signals. The new packet signal is interleaved by a channel and then subjected to an inverse Fourier transform, and the generated time domain OFDM signal is added with a cyclic prefix and sent to a communication channel. After receiving the signal, firstly, the received signal is Fourier-transformed, then inverse channel interleaved, and then the signal is grouped and demodulated. Firstly, the positions of two zeros in each grouped signal are determined based on the energy of the signal. Then, the analysis results of the other six BPSK signals are obtained according to the grouped inverse mapping relation and the traditional OFDM signal processing mechanism. The invention improves the transmission mechanism and can obtain lower transmission error rate performance than the traditional BPSK + OFDM modulation method under the same information transmission rate.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a signal transmission method combining binary phase shift keying modulation technology and orthogonal frequency division multiplexing technology. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM for short) is one of Multi Carrier Modulation (MCM for short) technologies. OFDM is widely used in the field of broadband wireless communication because of its high spectrum utilization rate and strong anti-multipath ability. OFDM divides the channel into several orthogonal sub-channels, converts high-speed data signals into parallel low-speed sub-data streams, and then modulates them onto each sub-channel for transmission. Orthogonal signals are separated by correlation techniques at the receiving end, thereby reducing mutual interference between sub-channels. Since the signal bandwidth on each sub-channel is smaller than the bandwidth of...

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Application Information

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IPC IPC(8): H04L27/20H04L27/26H04L27/32
CPCH04L27/20H04L27/2602H04L27/32
Inventor 谢映海李宏文卢莹莹
Owner ZHUHAI ZHONGHUI MICROELECTRONICS
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