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Radio communication system

A communication channel and signal technology, applied in wireless communication, radio transmission system, satellite radio beacon positioning system, etc., can solve the problem of sub-stream inefficiency, and achieve the effect of improving flexibility, efficiency and throughput

Inactive Publication Date: 2003-11-12
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently proposed MIMO systems use a fixed number of antennas at the transmitter and receiver and thus a fixed number of sub-streams, if the number of independent paths is lower than the number of sub-streams, the sub-streams become inefficient

Method used

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  • Radio communication system
  • Radio communication system
  • Radio communication system

Examples

Experimental program
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Embodiment Construction

[0028] best practice

[0029] figure 1 A known MIMO radio system is illustrated. Multiple applications 102 (AP1 to AP4) generate transmit data streams. Application 102 may also generate multiple data streams. The data streams are combined by a multiplexer (MX) 104 into a single data stream, which is provided to a transmitter (Tx) 106 . The transmitter 106 splits the data stream into sub-streams and maps each sub-stream to one or more of the plurality of transmit antennas 108 .

[0030]Appropriate encoding, typically including forward error correction (FEC), may be applied by transmitter 106 prior to multiplexing. This is considered vertical coding and has the advantage that the coding is applied on all sub-streams. However, problems may arise in extracting the sub-streams since joint decoding is required and extracting each sub-stream individually is difficult. As an alternative, each substream can be coded separately, a technique called horizontal coding, which simplifi...

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PUM

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Abstract

A radio communication system comprises a communication channel between two terminals each comprising a plurality of antennas (108). The communication channel comprises a plurality of paths, and at least one of the terminals comprises a receiver having means (306, 308) for determining the directions from which the strongest signals are received, corresponding to paths between the terminals. The terminal may also include a transmitter having means (302) for separating a signal into a plurality of parts, each having a reduced bit rate, and transmitting the parts in respective directions corresponding to those from which the strongest signals are received.

Description

field of invention [0001] The invention relates to a radio communication system comprising a communication channel comprising a plurality of paths between first and second terminals, each terminal comprising a plurality of antennas. The invention also relates to a terminal for use in such a system and a method of operating such a system. Background of the invention [0002] In a radio communication system, a radio signal typically travels from a transmitter to a receiver via multiple paths, each path involving reflections from one or more scattering sources. Received signals from those paths may interfere constructively or destructively (resulting in location-dependent fading) at the receiver. In addition, the different lengths of the paths, and thus the time it takes for a signal to propagate from the transmitter to the receiver, may cause intersymbol interference. [0003] It is well known that the above-mentioned problems caused by multipath propagation can be mitigated...

Claims

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Application Information

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IPC IPC(8): H04J99/00G01S19/24G01S19/36H04B7/04H04B7/06H04B7/08H04B7/10
CPCH04B7/0413H04B7/0617H04B7/02H04W16/28H04W52/26
Inventor B·哈特里
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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