Channel measurement and feedback method based on cognitive radio technology

A cognitive radio and channel measurement technology, applied in the field of channel measurement and feedback based on cognitive radio technology, can solve the problems of occupancy, large overhead, and increased pressure on frequency resource usage, so as to improve system capacity and reduce workload. The effect of frequency band overhead

Active Publication Date: 2016-10-12
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0003] However, the problem with this method is that for systems where the channel reciprocity cannot be satisfied, such as a frequency division duplex system, or a time division duplex TDD system with channel reciprocity mismatch, it is easy to generate large errors
At the same time, detecting and feeding back channel information on the communication frequency band needs to occupy the resources of this frequency band, which bri

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  • Channel measurement and feedback method based on cognitive radio technology

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[0019] Take the frequency division duplex FDD system as an example, the correlation between the idle frequency band and the working frequency band is high, and the resources of the idle frequency band are sufficient. At this time, because the channel reciprocity cannot be used, the overhead of channel measurement and feedback is generally the largest. .

[0020] This method works as follows:

[0021] (1) at the center for f w Detect the idle spectrum from near to far near the working frequency band, and obtain the center frequency f of the idle spectrum c , and available bandwidth B.

[0022] (2) Measure the respective channel conditions of the working frequency band and the available idle frequency band between transceivers, and then calculate the channel correlation between the available frequency band and the working frequency band, which can be, but not limited to, use the following calculation formula:

[0023] R H ...

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Abstract

In an existing millimeter-wave MIMO (Multiple Input Multiple Output) system, in order to execute relatively accurate beam forming or spatial multiplexing, commonly, a reference signal needs to be sent on a working frequency band of the system; after estimation, frequency domain, spatial dimension and intensity state information of a channel, which is changed along time, i.e. CSI (Channel State Information); and feedback is carried out. However, the scheme has the problems that a big error is easy to generate for a system which cannot meet channel reciprocity, a certain system cost is brought in, and flexibility of system capacity and resource allocation is influenced. Therefore, the invention discloses a channel measurement and feedback method based on a cognitive radio technology. An idle frequency band is detected near the working frequency band of the system, and according to channel correlation and an idle frequency band available resource condition, channel measurement or feedback of the CSI is flexibly selected to be executed on the idle frequency band or the working frequency band, so that cost on the working frequency band of the system is reduced, and spectral efficiency, reliability and coverage are improved.

Description

1. Technical field [0001] The present invention relates to the field of communication technology, in particular to a method for channel measurement and feedback based on cognitive radio technology in a wireless communication system. 2. Technical background [0002] In existing multi-antenna systems, reliable channel measurement and feedback methods are generally required in order to perform more accurate beamforming. Taking the communication between the base station and the mobile station in cellular mobile communication as an example, the downlink beamforming either requires the mobile station to measure the reference signal of the base station and then feed it back, or use channel reciprocity to estimate the downlink channel after the base station measures the transmission of the mobile station . The uplink beamforming also has a similar method. Either way, it is necessary to send a reference signal on the frequency band of service transmission, and calculate and feed ba...

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Application Information

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IPC IPC(8): H04B17/382H04B7/06
Inventor 张欣韦再雪
Owner BEIJING UNIV OF POSTS & TELECOMM
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