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Method and apparatus in relaying system

A technology of channel coefficients and transmitting signals, which is applied in transmission systems, baseband systems, digital transmission systems, etc., and can solve problems such as application

Inactive Publication Date: 2011-03-02
NOKIA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A key reason: Significantly higher data rates impose strict power implications

Method used

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  • Method and apparatus in relaying system
  • Method and apparatus in relaying system
  • Method and apparatus in relaying system

Examples

Experimental program
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Embodiment Construction

[0013] figure 1 The arrangement of a radio system employing signal relay is shown at a high level.

[0014] For example, the radio system may be an FDMA (Frequency Division Multiple Access) radio system applying a TDD (Time Division Duplex) or FDD (Frequency Division Multiple Access) mode. An example of such a radio system is 3GPP LTE (Long Term Evolution), which is a project in the 3rd Generation Partnership Project to improve the UMTS (Universal Mobile Telecommunications System) mobile phone standard to meet future needs.

[0015] exist figure 1 In the embodiment of , a relay system is assumed. In a relay system, there is no direct radio link between subscriber stations and destination stations communicating with each other. exist figure 1 In , for example, subscriber stations 102 and 108 communicate with destination station 120 via relay station 110 and there is no direct link between stations 102 and 120 . Each of stations 102, 108, 110, and 120 may be a mobile phone ...

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Abstract

An apparatus, comprising a channel estimator for estimating channel coefficients of communication channels of multiple-input-multiple-output communication, a precoder for applying the estimated channel coefficients to precode a transmit signal to cancel the impact of the communication channels on the transmit signal, a first controller for providing the transmit signal for multiple- input-multiple-output transmission in a first timeslot, a second controller for processing a multiple-input-multiple-output receive signal received in a second timeslot following the first timeslot, and a cancellator for cancelling the transmit signal from the receive signal.

Description

technical field [0001] The invention relates to radio communications in relay systems. Background technique [0002] A new network infrastructure needs to be developed for next generation wireless communication systems. A key reason: Significantly higher data rates impose strict power implications. This is because, given a fixed transmission power, the energy per symbol decreases as the data rate increases. [0003] Relay-based multi-hop wireless networks appear to be an economically sound solution and have attracted research and industry interest. [0004] Multi-hop networking can be applied to radio range extension of mobile and wireless broadband cellular networks and can be used to resist shadowing by high radio frequencies. By exploiting spatial diversity, multi-hop relay can enhance capacity in cellular networks. Contents of the invention [0005] In one aspect, an apparatus is provided, comprising: a channel estimator configured to estimate channel coefficients ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06
CPCH04L2025/03426H04L25/03343H04L25/0204H04B7/0452
Inventor 王海峰夏小梅金圣峣胡宏林
Owner NOKIA CORP