Wireless transmission method, wireless transmitter, and wireless receiver

Abstract

The invention provides a wireless transmission method, a wireless transmitter and a wireless receiver. According to number of data flows which should be transmitted, the wireless transmitter (1) controls the number of transmitting beams formed for transmitting the data flows; the wireless receiver (2) selects to receive more than one sending beam in the sending beams. The number of the sending beams is changed according to the number of the sent data flows, and therefore the high-throughput character based on relevancy of low beams in multi-flow transmission and large directional gain in single-flow transmission are realized.

Description

[0001] This application is the original application of the application date of February 2, 2006, the application number is 200680052201.X (international application number PCT / JP2006 / 301776), and the title of the invention is "wireless transmission method, wireless transmitter and wireless receiver" Divisional application. technical field [0002] The present invention relates to a wireless transmission method, a wireless transmitter, and a wireless receiver, and particularly relates to a wireless transmission technology suitable for use in multiple input and multiple output wireless transmission technologies that use multiple transceiver antennas for signal transmission in wireless communication systems such as mobile phones and wireless access. technology. Background technique [0003] In recent years, attention has been paid to MIMO (Multiple-Input Multiple-Output: Multiple-Input Multiple-Output) as a technology capable of effectively utilizing frequency bands for large-c...

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Problems solved by technology

[0016] Here, in the prior art described above, the number of beams to be formed is constant (for example, fixed to the maximum number of beams that can be formed) regardless of the number of transmission streams (in other words, the beam width per beam (directivity Intensity) constant), so the effect of MIMO multiplexing cannot be obtained through the selected beam, resulting in the degradation of throughput characteristics

[0017] For example, based on the feedback information from the receiving side, if beams with high correlation (for example, mutually adjacent beams) are selected on the transmitting side, it will result in separation of user data streams on the receiving side, demodulation processing Capability deterioration

Therefore, as long as the beam with low correlation degree is boldly selected, the separation and the deterioration of the demodulation processing capability can be suppressed. gain) the reception quality of a beam with good beam selection is poor

[0018] Here, as described in the above-mentioned Patent Document 1, if the signal matrix or reception weight used by the receiving side is fed back to the transmitting side as the feedback information, it is possible to adjust and select inter-beam correlation or beam directivity, and it is possible to alleviate the problem. The above-mentioned separation, degradation of demodulation processing capability, or degradation of reception quality leads to an increase in the amount of feedback information, and calculation processing is required for adjustment

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