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Transmission power distribution for MIMO communications when multiplicative noise limited

A technology of transmission power and multiplicative noise, applied in the field of MIMO transmission nodes, which can solve the problems of request power deterioration, problematic, low peak data rate, etc.

Active Publication Date: 2015-08-19
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, requesting power increases may worsen noise conditions that are proportional to or dependent on signal strength, i.e. multiplicative noise, especially if such noise conditions limit throughput conditions
Also, using fewer data streams results in lower peak data rates over wireless connections, which is expected to become more problematic as standards and technologies move toward transmitters and receivers capable of handling greater numbers of signal streams

Method used

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  • Transmission power distribution for MIMO communications when multiplicative noise limited
  • Transmission power distribution for MIMO communications when multiplicative noise limited
  • Transmission power distribution for MIMO communications when multiplicative noise limited

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Embodiment Construction

[0019] The methods and apparatus disclosed herein increase achievable MIMO throughput where MIMO throughput is limited by multiplicative noise, such as phase noise or quantization errors in devices, rather than additive noise, such as thermal noise or interference. To this end, when multiplicative noise limits throughput conditions, the transmit power is allocated across the data streams to reduce the transmit power allocated to the dominant signal path relative to the transmit power allocated to one or more data streams associated with the weaker signal path The transmit power of the associated data stream or streams. Such an allocation will improve the throughput profile and / or quality of the MIMO channel. Allocating transmission power in this manner provides a substantial improvement over when it is equally distributed across each data stream.

[0020] The invention is described below in terms of a Line of Sight (LOS) signal path. However, it should be understood that the...

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Abstract

Throughput conditions limited by multiplicative noise may be improved by distributing a transmission power across MIMO data streams communicated between MIMO communication nodes. In particular, the transmission power is distributed based on knowledge at the transmitter of the MIMO channel to decrease the transmission power allocated to one or more of the data streams associated with a dominant signal path relative to the transmission power allocated to one or more data streams associated with a weaker signal path to increase at least one of a quality and a throughput condition of the MIMO channel.

Description

technical field [0001] The present invention relates to a method for improving the throughput conditions for a wireless MIMO channel between a Multiple Input Multiple Output (MIMO) transmitter and a MIMO receiver in a wireless communication network. A MIMO transmitter includes an antenna array with multiple antennas. [0002] The invention also relates to a MIMO transmission node communicating with a MIMO receiver node via a MIMO channel in a wireless communication network. A MIMO transmission node includes an antenna array with multiple antennas. Background technique [0003] Multiple-Input Multiple-Output (MIMO) communications are becoming an integral part of current and future wireless communications standards. Using multiple transmit and receive antennas, MIMO communication enables multiple data streams to be communicated between a transmitter and receiver simultaneously and independently without consuming additional bandwidth or other radio resources. To this end, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04H04W52/24H04W52/34H04W52/42
CPCH04W52/248H04W52/241H04W52/346H04B7/0443Y02B60/50H04W52/42H04W52/247Y02D30/70
Inventor J·梅德波H·亚斯普伦德M·科尔德雷A·尼尔森M·利巴克K·威尔纳
Owner TELEFON AB LM ERICSSON (PUBL)