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Transmission scheme for multi-carrier MIMO systems

A communication system and power technology, applied in the field of data communication, can solve problems such as increased complexity

Active Publication Date: 2005-11-09
QUALCOMM INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional transmission schemes for spatial multiplexing are often designed very differently from those for transmit diversity
Therefore, if the transmitter and receiver in the system need to support multiple (and different) transmission schemes for spatial multiplexing and transmit diversity, then its complexity will be greatly increased

Method used

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  • Transmission scheme for multi-carrier MIMO systems
  • Transmission scheme for multi-carrier MIMO systems
  • Transmission scheme for multi-carrier MIMO systems

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Embodiment Construction

[0017] A rate adaptive transmission scheme for MIMO systems is described here. For a multi-carrier MIMO system, the transmission scheme may be used for each of multiple carriers that may be used for data transmission. For clarity, the rate adaptive transmission scheme is described below with respect to a single carrier MIMO system.

[0018] For a single-carrier MIMO system, by N T transmit antennas and N R The MIMO channel formed by receiving antennas can be decomposed into N S independent channels, where N S ≤min{N T , N R}. The number of independent channels is determined by the number of eigenmodes used for the MIMO channel, which in turn depends on the channel response matrix H , the channel response matrix H describe the N T transmit antennas and N R response between the receiving antennas. For simplicity, the following description assumes that: N T ≤N R , and the channel response matrix H is full rank (ie, N S =N T ≤N R ). Based on these assumptions, fo...

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Abstract

A rate adaptive transmission scheme for MIMO systems, which can transmit a variable number of data symbol streams, provide transmit diversity for each data symbol stream, and fully utilize the total transmit power of the system and the full power of each antenna. In one method, at least one data symbol stream is received for transmission from a plurality of antennas. Each data symbol stream is scaled with a respective weight corresponding to the amount of transmit power allocated to that stream. The scaled data symbol stream(s) are multiplied with a transmit basis matrix to provide a plurality of transmit symbol streams for the plurality of antennas. The transmit basis matrix (e.g., a Walsh-Hadamard matrix or a DFT matrix) is defined such that each data symbol stream is transmitted from all antennas and each transmit symbol stream is transmitted at (or near) the full power for the associated antenna.

Description

[0001] This application claims prior rights to U.S. Provisional Application 60 / 419,319, entitled "MIMOS Signaling Schemes for Rate Adaptive Systems," filed October 16, 2002, assigned to the assignee of this application, and hereby All are incorporated by reference. technical field [0002] The present invention relates generally to data communications, and in particular to rate adaptive transmission schemes for multiple-input multiple-output (MIMO) communication systems. Background technique [0003] A MIMO system employs multiple (N T ) transmit antenna and multiple (N R ) receiving antenna for data transmission. by the N T transmit antennas and N R The MIMO channel formed by receiving antennas can be decomposed into N s independent channels, where N s ≤min{N T , N R}. The N s Each of the independent channels corresponds to a dimension. The MIMO system can provide improved performance (eg, greater throughput and / or higher reliability) if the additional dimensiona...

Claims

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Application Information

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IPC IPC(8): H04B7/00H04J1/00
CPCY02B60/50
Inventor A·阿格拉瓦尔R·维贾亚恩T·卡杜斯
Owner QUALCOMM INC
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