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Intelligent antenna message transceiving method for CDMA high speed data base station

A high-speed data and smart antenna technology, applied in diversity/multi-antenna systems, space transmit diversity, baseband system components, etc., can solve problems affecting user data transmission services and system performance

Inactive Publication Date: 2009-07-22
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the adoption of the TDMA method, the inherent multiple access interference of the CDMA system can be effectively overcome, but due to the complexity of the mobile environment, multiple access interference still exists, which will affect the further improvement of system performance
At the same time, with the increase of user demand, the uplink capacity is also challenged, seriously affecting the data transmission service between users

Method used

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  • Intelligent antenna message transceiving method for CDMA high speed data base station
  • Intelligent antenna message transceiving method for CDMA high speed data base station
  • Intelligent antenna message transceiving method for CDMA high speed data base station

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Effect test

Embodiment 1

[0095] In this embodiment, the present invention is used to increase the uplink and downlink capacity of the existing CDMA 2000 1x EV-DO mobile communication system. Smart antenna technology can be used in the base station transceiver equipment of the cdma2000 1X EV-DO system to achieve uplink Directional reception and directional transmission of downlink high-speed data users. Its smart antenna element adopts 8-element linear or circular array, and the distance between the elements is half of the signal wavelength.

[0096] The base station terminal reception of this embodiment is as Figure 4 As shown, the figure shows the data processing process of the uplink voice or low-speed data user at the receiving end of the cdma2000 1x system base station. S in the figure 11 , S 21 ,..., S 81 The received signal for 8 elements is down-converted to output the signal, and then the baseband signal S is obtained by the quadrature amplitude demodulation circuit and low-pass filtering 13 , S ...

Embodiment 2

[0115] In this embodiment, a smart antenna is used to implement a CDMA2000 1x EV-DO base station transmitting and receiving method. The smart antenna element requirements and the base station downlink signaling method are the same as those in the first embodiment, and will not be discussed here. The difference is that when the base station uses smart antennas for directional reception of uplink data, the direction of arrival estimation and beamforming circuit implementation methods are different.

[0116] Figure 6 Shown is the block diagram of the base station receiving circuit of the second embodiment. The reception process is as follows:

[0117] 1) Downconversion signal (S 1 , S 2 ,..., S 8 ) After the carrier beamforming circuit (including the weighted sum circuit 62 and the weight coefficient modulation circuit 64), the directional reception is realized, and the signal S after the directional reception is sent to the quadrature amplitude demodulation circuit 63;

[0118] 2) ...

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Abstract

The invention relates to an intelligent aerial signal receiving and transmitting method of CDMA high speed data base station, belonging to the mobile communication technical field. The method adopts intelligent aerial technology in base station uplink signal receiving and downlink high speed data transmitting circuit and transmits the signal for the downlink voice user continuously adopts common sector directive aerial technology in the CDMA2000. The invention also relates to a base station uplink signal receiving and transmitting circuit and a downlink high speed data base station signal transmitting circuit, wherein, the uplink signal receiving wave beam figuration circuit can adopt two kinds of wave beam figuration method, namely the baseband wave beam figuration method and the carrier wave beam figuration method; the wave beam figuration method of the downlink signal transmitting can only adopt the carrier wave figuration method. The downlink wave beam figuration weight value can be instantly and directly obtained by the table look-up operation, using the uplink wave reaching direction DOA estimation, without predicting estimation on the downlink independent carrier frequency.

Description

Technical field [0001] The invention relates to a mobile communication method, in particular to a mobile communication method adopting a smart antenna to improve the CDMA2000 1x EV-DO uplink / downlink communication efficiency, and belongs to the field of mobile communication technology. Background technique [0002] In order to meet the requirements of the third-generation mobile communication system to provide Internet and multimedia services for high-speed data users, WCDMA and TD-SCDMA have proposed their own evolution plans, HSDPA and HSUPA. As one of the relatively mature standards of 3G standard development, CDMA2000, 3GPP2 has also successively released various versions of CDMA2000 1x EV-DO, which also have the functions of HSDPA and HSUPA to support the extension of the CDMA2000 1x standard to the wireless Internet, which is a high-speed mobile Data users increase the uplink / downlink multi-rate service. The outstanding change of CDMA2000 1x EV-DO is the addition of an inde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/08H04B1/707H04L25/03
Inventor 贾向东傅海阳赵来强郑建光
Owner NANJING UNIV OF POSTS & TELECOMM
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