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Coherent Transmission of Distributed Wireless Transmitters

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

Inactive Publication Date: 2018-02-16
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 of Distributed Wireless Transmitters
  • Coherent Transmission of Distributed Wireless Transmitters
  • Coherent Transmission of Distributed Wireless Transmitters

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Experimental program
Comparison scheme
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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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PUM

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Abstract

In one aspect, a distributed coherent transmission system enables the transmission of individual wireless transmitters with independent frequency or clock references to mimic a system in which all transmitters share the same frequency or clock reference. Processing between transmitters by appropriately precoding the signal based on a synchronous transmission from one of the transmitters (e.g., the master transmitter) received by the corresponding receiver prior to modulating one or more of the transmitters The respective receivers share a frequency or clock reference with each of the one or more transmitters. This distributed coherent transmission system enables N single-antenna transmitters with independent frequency or clock references to emulate a single N-antenna multiple-input-output (MIMO) transmitter, or implements such as distributed superposition that require individual transmitters to be coherent Coding or lattice code and other schemes.

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, funded by the National Science Foundation (National Science Foundation), 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 medi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/26H04L25/03H04L27/00
CPCH04L27/2691H04L25/0204H04L27/2695H04L27/2634H04L27/2657
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