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Diversity reception method based on reverse-phase symmetric method

A technology of diversity reception and receiving end, which is applied in the field of signal transmission, can solve problems such as cost increase and system complexity, and achieve the effects of fewer carrier frequencies, fewer antennas, and reduced system cost and complexity

Inactive Publication Date: 2011-05-25
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is to divide the same signal into two transmissions (i.e. m=2), and use the correlation of the two noises to improve the signal-to-noise ratio of the system to solve the system problems caused by the increase in the antenna spacing and the number of transmission channels in the above method. The problem of increased complexity and cost

Method used

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  • Diversity reception method based on reverse-phase symmetric method
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  • Diversity reception method based on reverse-phase symmetric method

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Embodiment 1

[0043] In the present invention, the reverse symmetry method is used in the diversity receiving technology, and the transmitting end simultaneously sends two paths of mutually inverse signals, and the receiving end respectively demodulates the two paths of signals and then subtracts them, or inverts one path and then combines them with the Add another way.

Embodiment 2

[0045] as attached figure 2 As shown, the two opposite signals s 1 (t) and s 2 (t), respectively modulated at two carrier frequencies f 1 , f 2 , the interval between these two carrier frequencies is the signal bandwidth f m 1 to 6 times of

[0046] |f 1 -f 2 |=(1~6)f m

[0047] At the receiving end, use two spacings of (0~3)λ 0 The receiving antenna receives these two signals. in

[0048] lambda 0 ≈2 / (f 1 + f 2 )

[0049] Note: When the spacing is 0, it means that only one antenna is used for reception.

[0050] The receiver demodulates the two signals separately, and then subtracts the demodulated signals or inverts one of them and adds it to the other, so as to extract the useful signal and suppress the noise.

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Abstract

A diversity reception based on phase inversion symmetric method includes sending out two paths of reciprocal signals simultaneously by sending end, demodulating said two paths of signals separately by receiving end and then carrying out mutual subtraction between two demodulated signals for effectively improving S-N radio.

Description

technical field [0001] The invention belongs to a signal transmission method in a radio communication system, in particular to a diversity receiving method based on an antisymmetric method in electric signal transmission. Background technique [0002] Diversity reception technology is often used in previous wireless communication systems to overcome channel fading and improve system performance. Among them are space diversity, frequency diversity and so on. Space diversity is to use multiple receiving and sending antennas to transmit the same signal; frequency diversity is to use multiple carrier frequencies to transmit the same signal. In order to ensure that the statistics of each channel are independent, the distance between the antennas must be far enough or the distance between each carrier frequency must be large enough. Multiple signal copies are obtained at the receiving end, and various combining criteria are used to maximize the signal-to-noise ratio (SNR) at the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/08H04L1/02
Inventor 萧英喆萧宝瑾郗绣锦郎强
Owner TAIYUAN UNIV OF TECH