Wireless transmission method, wireless transmitter and wireless receiver

Abstract

The invention provides a wireless transmission method, a wireless transmitter and a wireless receiver. The wireless transmitter (1) controls the number of transmitting wave beams formed for transmitting data flows according to the number of the data flows to be transmitted; and the wireless receiver (2) selectively receives optional more than one transmitting wave beam in the transmitting wave beams. The number of the transmitting wave beams to be formed is changed according to the number of the data flows to be transmitted, so that low-beam correlation degree-based high throughput characteristic and single-flow high directional gain can be realized during multi-flow transmission.

Description

[0001] This application is an original application with the filing date of February 2, 2006, the application number of 200680052201.X (International Application Number PCT / JP2006 / 301776), and the title of the invention "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 more particularly to a multiple-input multiple-output wireless transmission technology suitable for use in wireless communication systems such as mobile phones or wireless access systems using multiple transceiver antennas for signal transmission technology. Background technique [0003] In recent years, attention has been paid to MIMO (Multiple-Input Multiple-Output: Multiple-Input Multiple-Output) as a technology that can effectively use frequency bands for large-capacity (high-speed) data communication. MIMO refers to the fo...

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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) is 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, the user data streams will be separated at the receiving side, and demodulation processing Capability deterioration

Therefore, as long as the beam with low correlation is boldly selected, the separation and the deterioration of the demodulation processing capability can be suppressed. Gain) the reception quality of the 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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