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Coherent transmission from distributed wireless transmitters

A technology of transmitter and main transmitter, applied in the field of coherent transmission, can solve the problems of inability to improve user throughput, small constant gain, mutual interference, etc.

Inactive Publication Date: 2014-08-13
MASSACHUSETTS INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such techniques provide only a small constant gain that does not increase with the number of users
Furthermore, simply adding additional transmitters will not improve user throughput as these transmitters will interfere with each other

Method used

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  • Coherent transmission from distributed wireless transmitters
  • Coherent transmission from distributed wireless transmitters
  • Coherent transmission from distributed wireless transmitters

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Embodiment Construction

[0030] 1 Overview

[0031]The system described herein simulates a system with N single-antenna transmitters with independent frequency and clock references, where the N transmitters use a common carrier reference with continuous phase and frequency at the access point. This enables N single-antenna transmitters to simulate, eg, a single N-antenna multiple-input multiple-output (MIMO) transmitter. The simulated N-antenna MIMO transmitter can transmit N parallel streams that do not interfere with each other, and transmit N parallel streams to N users through beamforming, nulling, or more generally multiple-input multiple-output (MIMO) techniques, such as , to zero a specific receiver while transmitting fewer than N streams. For example, such a system can be used in large rooms (eg, conference centers) or outdoor environments (eg, dense urban areas), providing tens or hundreds of transmitters capable of transmitting a corresponding number of data streams in parallel without inte...

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Abstract

In one aspect, a distributed coherent transmission system enables transmissions from separate wireless transmitters with independent frequency or clock references to emulate a system where all the transmitters share a common frequency or clock reference. Differences in frequency and / or phase between transmitters are addressed by suitably precoding signals before modulation at one or more of the transmitters based on a synchronizing transmission from one of the transmitters (e.g., a master transmitter) received at a corresponding receiver sharing the frequency or clock reference with each of the one or more transmitters. Such a distributed coherent transmission system can allow N single-antenna transmitters with independent frequency or clock references to emulate a single N-antenna Multi Input Multi Output (MIMO) transmitter, or implement schemes such as distributed superposition coding or lattice codes that require coherence across separate transmitters.

Description

[0001] Cross References to Related Documents [0002] This application claims the benefit of U.S. Provisional Application 61 / 543,832, filed October 6, 2011, (Attorney Docket No. 70009-D13P01; Client Case No. 14965), which is incorporated herein by reference in its entirety. [0003] Statement of Federally Funded Research [0004] This invention was made with government support awarded by the National Science Foundation under contract number CCF-0728645. The government has certain rights in this invention. Background of the invention [0005] The invention relates to coherent transmission with distributed wireless transmitters. Specifically, in some examples, these transmitters are: access points (APs), such as in 802.11, base stations, relay stations, or other wireless nodes such as in a cellular network. [0006] Traditional wireless networks, such as 802.11 or cellular networks, can be limited by interference. For example, since the wireless medium is shared, if two near...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04L25/03H04L27/00
CPCH04L27/2695H04L27/2691H04L27/2657H04L27/2634H04L25/0204
Inventor 哈里哈兰桑卡·拉胡尔斯沃若恩苏雷什·库玛尔迪纳·卡塔比
Owner MASSACHUSETTS INST OF TECH
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