CN107969031B - Main channel gain and cross channel gain joint estimation method - Google Patents

Main channel gain and cross channel gain joint estimation method Download PDF

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CN107969031B
CN107969031B CN201710981442.2A CN201710981442A CN107969031B CN 107969031 B CN107969031 B CN 107969031B CN 201710981442 A CN201710981442 A CN 201710981442A CN 107969031 B CN107969031 B CN 107969031B
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sensing node
current sensing
authorized user
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channel gain
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CN107969031A (en
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姚俊腾
金明
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Ningbo University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/08—Closed loop power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/143—Downlink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0473—Wireless resource allocation based on the type of the allocated resource the resource being transmission power
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria

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Abstract

The invention discloses a method for jointly estimating main channel gain and cross channel gain, which comprises the following processing procedures: firstly, randomly selecting a sensing node as a current sensing node, setting the current sensing node to adopt a full-duplex transceiver, and setting the current sensing node to have a plurality of different transmitting powers; secondly, the current sensing node selects each kind of transmitting power to transmit signals to the receiver of the authorized user once, and simultaneously the current sensing node receives the signals transmitted by the transmitter of the authorized user and estimates the transmitting power of the transmitter of the authorized user; finally, according to all the transmitting powers of the current sensing node and the current sensing node, selecting each transmitting power to transmit signals to the receiver of the authorized user once, estimating the obtained transmitting power of the transmitter of the authorized user, and estimating the gain of the main channel and the gain of the cross channel; the method has the advantages that the method can simultaneously estimate the main channel gain and the cross channel gain without authorizing a backhaul link from a user receiver to a sensing node.

Description

Main channel gain and cross channel gain joint estimation method
Technical Field
The invention relates to a channel gain estimation method in a cognitive radio system, in particular to a main channel gain and cross channel gain joint estimation method.
Background
Cognitive radio is one of effective technologies to solve the problem of shortage of spectrum resources. The cognitive node using the cognitive radio technology uses the spectrum of an authorized user in two ways, namely: opportunistic spectrum access and spectrum sharing. For an opportunistic spectrum access mode, a sensing node needs to detect a spectrum occupation state of an authorized user, and when the authorized user does not occupy a spectrum (namely the spectrum is in an idle state), the sensing node can access the spectrum; when the authorized user re-occupies the spectrum, the sensing node should exit as soon as possible to avoid interference to the authorized user. For the spectrum sharing mode, on the premise that the signal-to-interference-and-noise ratio of the receiver of the authorized user is not lower than the preset threshold, even if the authorized user occupies the spectrum, the sensing node is allowed to access the spectrum of the authorized user, and therefore compared with the opportunistic spectrum access mode, the spectrum sharing mode can achieve higher spectrum utilization rate.
In spectrum sharing, in order to ensure that the signal-to-interference-and-noise ratio of the authorized user receiver is not lower than a preset threshold, the sensing node must estimate the channel gain between the authorized user transmitter and the authorized user receiver (called main channel gain) and the channel gain between the sensing node and the authorized user receiver (called cross channel gain). The existing method is that the sensing node adopts a full duplex transceiver (i.e. the sensing node can simultaneously transmit and receive signals), and then the main channel gain and the cross channel gain are respectively and independently estimated. However, this method requires knowledge of the cross-channel gain to estimate the main channel gain; the gain of the main channel is required to be known to estimate the gain of the cross channel, so that when the gain of the main channel and the gain of the cross channel are unknown, the method cannot estimate the gain of the main channel and the gain of the cross channel; on the other hand, in the process of estimating the main channel gain or in the process of estimating the cross channel gain, the method needs the backhaul link from the authorized user receiver to the sensing node, that is, the authorized user receiver needs to transmit information (feedback information) to the sensing node, however, in practical application, the feedback information of the authorized user receiver cannot be obtained, and the method is not practical.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for jointly estimating the main channel gain and the cross channel gain, which can simultaneously estimate the main channel gain and the cross channel gain without authorizing a return link from a user receiver to a sensing node.
The technical scheme adopted by the invention for solving the technical problems is as follows: a joint estimation method of main channel gain and cross channel gain is characterized in that the processing procedure is as follows: firstly, randomly selecting a sensing node in a cognitive radio system as a current sensing node, setting the current sensing node to adopt a full-duplex transceiver, and setting the current sensing node to have a plurality of different transmitting powers; secondly, the current sensing node selects each kind of transmitting power to transmit signals to the receiver of the authorized user once, and simultaneously the current sensing node receives the signals transmitted by the transmitter of the authorized user and estimates the transmitting power of the transmitter of the authorized user; and finally, according to all the transmitting powers of the current sensing node and the current sensing node, selecting each transmitting power to transmit signals to the receiver of the authorized user once, estimating the obtained transmitting power of the transmitter of the authorized user, and estimating the gain of the main channel and the gain of the cross channel.
The joint estimation method of the main channel gain and the cross channel gain specifically comprises the following steps:
the method comprises the following steps: setting N sensing nodes in a cognitive radio system; randomly selecting one sensing node as a current sensing node for estimating main channel gain and cross channel gain; setting the current sensing node to adopt a full duplex transceiver, setting J different transmitting powers of the current sensing node, and recording the jth transmitting power of the current sensing node as p1(j) (ii) a Wherein N is more than or equal to 1, J is more than or equal to 1, and J is more than or equal to 1 and less than or equal to J;
step two: the current sensing node selects each kind of emission power to emit signals to the authorized user receiver once, and simultaneously the current sensing node receives the signals emitted by the authorized user emitter and estimates the emission power of the authorized user emitter, and selects p as the current sensing node1(j) The current sensing node receives the signal transmitted by the authorized user transmitter and the estimated transmission power of the authorized user transmitter is recorded as p0(j)；
Step three: according to all the transmitting powers of the current sensing node and the current sensing node, selecting each transmitting power to transmit signals to the receiver of the authorized user once, estimating the transmitting power of the transmitter of the authorized user, estimating the gain of the main channel and the gain of the cross channel at the same time, and recording the gains as g correspondinglypAnd gc，
Figure BDA0001439531560000031
Figure BDA0001439531560000032
Wherein,
Figure BDA0001439531560000033
representing the noise power, gamma, of the receiver of the authorized usertA preset threshold representing the signal to interference plus noise ratio of the authorized user receiver.
Compared with the prior art, the invention has the advantages that:
1) under the condition that the sensing node adopts a full-duplex transceiver, when the gain of a main channel and the gain of a cross channel are unknown, the method can be used for estimating and obtaining the gain of the main channel and the gain of the cross channel simultaneously.
2) The method can simultaneously estimate and obtain the main channel gain and the cross channel gain only by sensing the transmitting power of the node and the transmitting power of the corresponding authorized user transmitter, and does not need a return link from the authorized user receiver to the sensing node, so the method is closer to practical application.
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FIG. 1 is a block flow diagram of the method of the present invention;
fig. 2 is a schematic diagram of the estimation error of the main channel gain and the cross channel gain estimated by the method of the present invention varying with the number of kinds of the transmission power of the sensing node.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The flow chart of the method for jointly estimating the main channel gain and the cross channel gain is shown in figure 1, and the processing process comprises the following steps: firstly, randomly selecting a sensing node in a cognitive radio system as a current sensing node, setting the current sensing node to adopt a full-duplex transceiver, and setting the current sensing node to have a plurality of different transmitting powers; secondly, the current sensing node selects each kind of transmitting power to transmit signals to the receiver of the authorized user once, and simultaneously, the current sensing node receives the signals transmitted by the transmitter of the authorized user and estimates the transmitting power of the transmitter of the authorized user by utilizing the prior art; and finally, according to all the transmitting powers of the current sensing node and the current sensing node, selecting each transmitting power to transmit signals to the receiver of the authorized user once, estimating the obtained transmitting power of the transmitter of the authorized user, and estimating the gain of the main channel and the gain of the cross channel.
The joint estimation method of the main channel gain and the cross channel gain specifically comprises the following steps:
the method comprises the following steps: setting N sensing nodes in a cognitive radio system; randomly selecting one sensing node as a current sensing node for estimating main channel gain and cross channel gain; setting the current sensing node to adopt a full duplex transceiver, setting J different transmitting powers of the current sensing node, and recording the jth transmitting power of the current sensing node as p1(j) (ii) a Where N is equal to or greater than 1, in this embodiment, N is equal to 1, J is equal to or greater than 1, and in this embodiment, the numeric area of J is [50,500 ]]，1≤j≤J。
Step two: the current sensing node selects each kind of transmitting power once to transmit signals to the receiver of the authorized user, simultaneously the current sensing node receives the signals transmitted by the transmitter of the authorized user and estimates the transmitting power of the transmitter of the authorized user by utilizing the prior art, and the current sensing node is selected as p1(j) The current sensing node receives the signal transmitted by the authorized user transmitter while transmitting the signal to the authorized user receiver, and the transmission power of the authorized user transmitter estimated by the prior art is recorded as p0(j)。
Here, because the current sensing node selects different transmission powers to transmit signals to the authorized user receiver, the authorized user receiver changes the transmission power of the authorized user transmitter by using a closed-loop power control technique in order to satisfy a certain signal-to-interference-and-noise ratio, so that the current sensing node can estimate the transmission power of the corresponding authorized user transmitter by changing the transmission power of the current sensing node for a plurality of times.
Step three: according to the current perception nodeAll the transmission powers of the points and the current sensing node select each transmission power once to transmit signals to the receiver of the authorized user, and simultaneously estimate the transmission power of the transmitter of the authorized user, and simultaneously estimate the gain of the main channel and the gain of the cross channel, which are correspondingly marked as gpAnd gc，
Figure BDA0001439531560000041
Figure BDA0001439531560000051
Wherein,
Figure BDA0001439531560000052
representing the noise power, gamma, of the receiver of the authorized usertA preset threshold representing the signal to interference plus noise ratio of the authorized user receiver,
Figure BDA0001439531560000053
and gammatCan be obtained by the prior art.
The feasibility and effectiveness of the method of the present invention is further illustrated by the following simulations.
Fig. 2 shows a schematic diagram of the variation of the estimation error of the main channel gain and the cross channel gain estimated by the method of the present invention with the number J of the transmission power of the sensing node. As can be seen from fig. 2, the method of the present invention has a smaller channel gain estimation error; in addition, the estimation error of the main channel gain and the cross channel gain can be reduced along with the increase of the number J of the transmission power of the sensing node.

Claims (1)

1. A joint estimation method of main channel gain and cross channel gain is characterized in that the processing procedure is as follows: firstly, randomly selecting a sensing node in a cognitive radio system as a current sensing node, setting the current sensing node to adopt a full-duplex transceiver, and setting the current sensing node to have a plurality of different transmitting powers; secondly, the current sensing node selects each kind of transmitting power to transmit signals to the receiver of the authorized user once, and simultaneously the current sensing node receives the signals transmitted by the transmitter of the authorized user and estimates the transmitting power of the transmitter of the authorized user; finally, according to all the transmitting powers of the current sensing node and the current sensing node, selecting each transmitting power to transmit signals to the receiver of the authorized user once, estimating the obtained transmitting power of the transmitter of the authorized user, and estimating the gain of the main channel and the gain of the cross channel;
the joint estimation method of the main channel gain and the cross channel gain specifically comprises the following steps:
the method comprises the following steps: setting N sensing nodes in a cognitive radio system; randomly selecting one sensing node as a current sensing node for estimating main channel gain and cross channel gain; setting the current sensing node to adopt a full duplex transceiver, setting J different transmitting powers of the current sensing node, and recording the jth transmitting power of the current sensing node as p1(j) (ii) a Wherein N is more than or equal to 1, J is more than or equal to 1, and J is more than or equal to 1 and less than or equal to J;
step two: the current sensing node selects each kind of emission power to emit signals to the authorized user receiver once, and simultaneously the current sensing node receives the signals emitted by the authorized user emitter and estimates the emission power of the authorized user emitter, and selects p as the current sensing node1(j) The current sensing node receives the signal transmitted by the authorized user transmitter and the estimated transmission power of the authorized user transmitter is recorded as p0(j)；
Step three: according to all the transmitting powers of the current sensing node and the current sensing node, selecting each transmitting power to transmit signals to the receiver of the authorized user once, estimating the transmitting power of the transmitter of the authorized user, estimating the gain of the main channel and the gain of the cross channel at the same time, and recording the gains as g correspondinglypAnd gc，
Figure FDA0002549953010000011
Figure FDA0002549953010000021
Wherein,
Figure FDA0002549953010000022
representing the noise power, gamma, of the receiver of the authorized usertA preset threshold representing the signal to interference plus noise ratio of the authorized user receiver.
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CN102790995A (en) * 2012-08-16 2012-11-21 电子科技大学 Information channel gain estimation method based on cognitive radio
CN105071879A (en) * 2015-08-28 2015-11-18 电子科技大学 Detection method for judging area of cognitive user in cross-channel gain estimation

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US7602837B2 (en) * 2005-10-20 2009-10-13 Freescale Semiconductor, Inc. Beamforming for non-collaborative, space division multiple access systems

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Publication number Priority date Publication date Assignee Title
CN102790995A (en) * 2012-08-16 2012-11-21 电子科技大学 Information channel gain estimation method based on cognitive radio
CN105071879A (en) * 2015-08-28 2015-11-18 电子科技大学 Detection method for judging area of cognitive user in cross-channel gain estimation

Non-Patent Citations (2)

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Proactive Cross-Channel Gain Estimation for Spectrum Sharing in Cognitive Radio;Lin Zhang等;《IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS》;20160901;全文 *

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