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Adaptive diversity merging method of base band receiver for double antenna system

A dual-antenna and receiver technology, applied in the field of diversity combining, can solve the problem that the signal is not the best received signal, and achieve the effects of good compatibility, simple implementation, and guaranteed performance and stability

Inactive Publication Date: 2007-03-28
ZTE CORP
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AI Technical Summary

Problems solved by technology

The signal obtained by using the above-mentioned diversity reception technology is not the best received signal

Method used

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  • Adaptive diversity merging method of base band receiver for double antenna system
  • Adaptive diversity merging method of base band receiver for double antenna system
  • Adaptive diversity merging method of base band receiver for double antenna system

Examples

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Embodiment Construction

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

[0021] As shown in Figure 1, the mobile communication system includes a transmitting system and a receiving system. The receiving system implements signal reception through a dual-antenna system, and the two antennas send the received signals to the baseband receiver. The baseband receiver first uses the demodulation module to perform diversity combining and demodulation on the received baseband signals (I, Q). After the demodulated results are deinterleaved, they are sent to the channel decoding module for channel decoding, and then The signal is decoded by a decoder and the information sent by the source is obtained.

[0022] When the dual-antenna system receives two signals (I, Q), the baseband receiver performs the following steps:

[0023] 1. Calculate the level value RSSI of the two channels of received signals, the energy sum of the estimated values ​...

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Abstract

The method includes steps: (1) calculating both signal level values received by the twin antenna, the energy of channel parameter estimate value and noise square-root difference estimate value; (2) comparing both signal level values with the preset threshold; if both signal values are greater than preset, then turning to step 3; if only one signal value is great than preset, it decodes and equilibrates the one greater; if both values are less than preset, steps finish; (3) comparing whether the energy sum of both channel parameter estimate values is in set range; if yes, then turning to step 4; otherwise, it demodulates and equilibrates only the greater one; (4) if both signal noise square-root difference estimate values are less than the threshold, then carrying out merger of equal gain for the two signals, demodulating and equilibrating both signal; otherwise, max-ratio combines, demodulates and equilibrates them. This method is simple and efficient.

Description

technical field [0001] The invention relates to a diversity combination method in a wireless mobile communication system, in particular to an adaptive diversity combination method for a baseband receiver in a dual-antenna system. Background technique [0002] In the mobile communication process, the channel characteristics of the wireless channel are very bad, mainly manifested as multipath fading and Doppler fading. This will cause the received level of the wireless signal to drop to around the thermal noise level, and the phase will also change randomly over time, resulting in a decrease in communication quality. To solve this problem, diversity reception technology can generally be used to reduce the impact of fading, obtain diversity gain, and improve reception sensitivity. There are many methods of diversity, mainly including space diversity, frequency diversity, polarization diversity, angle diversity, time diversity and component diversity. Because space diversity r...

Claims

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Application Information

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IPC IPC(8): H04B7/08
Inventor 马岚熊岗单淑伟王伟
Owner ZTE CORP
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