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Multicarrier communication system employing explicit frequency hopping

A mobile communication system and sub-carrier technology, applied in the field of multi-carrier communication systems, can solve problems such as bandwidth allocation dependence, system efficiency reduction, and inability to know in advance

Active Publication Date: 2017-11-21
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another issue is that the bandwidth allocation depends on the instantaneous channel conditions of the mobile devices and thus cannot be known in advance
If the frequency pattern is established without considering the bandwidth allocation, bandwidth allocation must be made to avoid collisions, which will reduce the efficiency of the system

Method used

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  • Multicarrier communication system employing explicit frequency hopping
  • Multicarrier communication system employing explicit frequency hopping
  • Multicarrier communication system employing explicit frequency hopping

Examples

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Embodiment Construction

[0021] Referring now to the drawings, an exemplary transmitter is shown and generally indicated by the numeral 10, in accordance with an exemplary embodiment of the present invention. The transmitter 10 is configured to implement a transmission scheme known as Single Carrier Orthogonal Frequency Division Multiplexing (SC-OFDM). Variable bandwidth allocation and frequency hopping are used to achieve efficient utilization of radio resources. Variable bandwidth allocation is achieved by dynamically allocating different numbers of subcarriers to different mobile terminals according to their instantaneous channel conditions. The frequency hopping pattern is determined "on the fly" based on the current bandwidth allocation. The bandwidth allocation and frequency hopping pattern are signaled to the mobile terminal in a scheduling grant.

[0022] refer to figure 1 , the transmitter 10 includes a transmit signal processor 12 , an Orthogonal Frequency Division Multiplexing (OFDM) pro...

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Abstract

The invention relates to a multicarrier communication system employing explicit frequency hopping. Variable bandwidth assignment and frequency hopping are employed to make efficient use of radio resources. Variable bandwidth assignment is achieved by dynamically allocating different numbers of subcarriers to different wireless communication devices depending on their instantaneous channel conditions. The frequency hopping patterns are determined on-the-fly based on the current bandwidth assignments. The bandwidth assignments and frequency hopping patterns are signaled to the wireless communication devices in a scheduling grant.

Description

technical field [0001] The present invention relates generally to multicarrier communication systems, and more particularly to Orthogonal Frequency Division Multiplexing (OFDM) systems employing frequency hopping. Background technique [0002] Frequency hopping is a spread spectrum technique used in many radio communication applications. In a frequency hopping spread spectrum system, the transmitter varies its transmission frequency over time according to a pseudorandom frequency hopping pattern. In effect, the transmitter "hops" from one frequency to another during transmission to spread its signal over a wide frequency band, while at any given moment, the transmitted signal occupies a narrow frequency band. A hopping period is referred to herein as a slot, which is a time interval during which the frequency remains constant. A frequency hopping pattern includes a sequence of frequencies on which a transmitter hops. [0003] Frequency hopping provides frequency diversity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/713H04L5/00H04W72/12
CPCH04B1/713H04L5/0007H04W72/12H04W72/23H04L5/001H04L5/0012H04W72/1268H04W72/542H04L5/006H04B1/7143H04W72/0453H04W72/1273H04B1/59H04L27/2627H04L27/2657H04W88/08
Inventor E.达尔曼Y.贾丁P.斯基勒马克S.帕克瓦尔
Owner TELEFON AB LM ERICSSON (PUBL)