KR20130139564A - Method for operation of multi piconet system using frequency hopping code and apparatus supporting the method - Google Patents

Method for operation of multi piconet system using frequency hopping code and apparatus supporting the method Download PDF

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KR20130139564A
KR20130139564A KR1020120063113A KR20120063113A KR20130139564A KR 20130139564 A KR20130139564 A KR 20130139564A KR 1020120063113 A KR1020120063113 A KR 1020120063113A KR 20120063113 A KR20120063113 A KR 20120063113A KR 20130139564 A KR20130139564 A KR 20130139564A
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frequency hopping
hopping code
matrix
odd
frequency
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KR1020120063113A
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Korean (ko)
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신승룡
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엘지전자 주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/715—Interference-related aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B2001/6904—Spread spectrum techniques using code hopping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B2001/6908—Spread spectrum techniques using time hopping

Abstract

A method of operating a CR-UWB multiple piconet system using a frequency hopping code and an apparatus supporting the same are provided. The method is a method and apparatus for operating a multiple pico base station in a wireless communication system, wherein the first pico base station uses a first frequency hopping code in a first frequency band of a first time interval to transmit a signal transmitted by the first pico base station. Frequency hopping; And frequency hopping, by the second pico base station, a signal transmitted by the second pico base station using a second frequency hopping code in the first frequency band of the second time period. A method and apparatus are provided wherein the two time periods are discontinuous.

Description

TECHNICAL FOR OPERATION OF MULTI PICONET SYSTEM USING FREQUENCY HOPPING CODE AND APPARATUS SUPPORTING THE METHOD}

The present invention relates to wireless communication, and more particularly, to a method of operating a cognitive radio ultra wide band (CR-UWB) multi piconet system using a frequency hopping code, and the same. It is about supporting devices.

CR-UWB is an application technology of cognitive radio (CR) and is a field that has been actively researched recently. Conventional CR uses an overlay technique that uses an empty frequency band after occupying an empty frequency band without using it, but CR-UWB is proposed by the Federal Communication Commission (FCC). A combination of the two methods combined with compliance with the Part 15 Limit (radies below -41.25 dBm per MHz) and UWB's traditional Underlay method. Underlay method is also being studied a lot recently.

There are various techniques of CR-UWB system such as Time Hopping (TH), Multi Band OFDM (MB-OFDM), Direct Sequence Spread-Spectrum (DS-SS), and Multi Band Frequency Hopping (MB-FH). The recognition method and the main user interference avoidance technique are also different. When using MB-FH multiple access scheme, Band-Dropping method is used. If the signal of main user is detected in multi band, this band is not used. In case of MB-OFDM, a subcarrier nulling method is used. This method does not transmit a signal to a subcarrier when a user signal exists first in a corresponding subcarrier. For the TH method, spectrum shaping can mitigate or eliminate interference to preferred user systems, such as Institute of Electrical and Electronics Engineers (IEEE) 802.11a in the 5 GHz band and worldwide interoperability for microwave access (WiMAX). have. In case of the CR-UWB system using the TH method, even though interference with the main user is avoided through spectral shaping, very low transmission power is required due to the FCC Part 15 Limit, which results in transmission distance limitation and high quality. There is a difficulty in maintaining the SNR for the service. TH CR-UWB system is a system that allows multiple users to access multiple times of the time hopping technique. Pulse Position Modulation (PPM) modulation is used. The transmission / reception signals considering multiple users are shown in Equations 1 and 2 below. The time band graph of the transmission / reception signal is shown in FIG. 1.

Figure pat00058

Figure pat00059

In Equation 1, S (t) is a transmission signal of the TH CR-UWB system, g ( t ) is a pulse number, and N s is a number of pulses required to transmit one binary symbol. The time duration T b required to transmit one binary symbol becomes N s T f . c j T c represents the time hopping code. Equation 2 is a received signal, where N u represents the number of multiple users and n ( t ) represents Additive White Gaussian Noise (AWGN).

The technical problem to be achieved by the present invention is to use a very low transmission power by the FCC Part 15 Limit in the case of CR-UWB, and due to this, certain conditions are satisfied for the transmission distance constraint and the frequency that the main user does not use for a certain time. It is difficult to maintain stable SNR for high quality service because it is temporarily occupied and used. In order to maintain a high SNR under such bad conditions, it is necessary to first suppress the adverse effects that may occur internally separately from the conditions outside the CR user group. It is very important to suppress the interference among CR-UWB users, which is the biggest adverse effect internally, as much as possible, and the influence of interference between frequency hopping codes used in the multiple piconet structure also affects the main user and CR-UWB users. Go crazy. Therefore, in order to maximize the efficiency of radio resources, a CR environment in which a maximum CR user can have maximum performance and minimum interference to a main user is required for a CR environment in which the maximum purpose is achieved. We propose a multi-band frequency hopping code that can minimize the interference of multi-path waves.

The present invention provides a method and apparatus for operating a CR-UWB multiple piconet system using a frequency hopping code.

The technical problems to be solved by the present invention are not limited to the technical problems and other technical problems which are not mentioned can be understood by those skilled in the art from the following description.

In one aspect of the present invention, a method of operating a CR-UWB multiple piconet system using a frequency hopping code is provided.

In an aspect of the present invention, in a method of operating a multiple pico base station in a wireless communication system, a first pico base station transmits the first pico base station by using a first frequency hopping code in a first frequency band of a first time period. Frequency hopping the signal; And frequency hopping, by the second pico base station, a signal transmitted by the second pico base station using a second frequency hopping code in the first frequency band of the second time period. A method is provided wherein the two time periods are discontinuous.

In another aspect of the present invention, a method of receiving a signal in a wireless communication system, the method comprising: receiving a signal hopping from a first pico base station according to a first frequency hopping code; And receiving a signal hopping from a second pico base station according to a second frequency hopping code that is different from the first frequency hopping code, wherein the first frequency hopping code and the second frequency hopping code are the same specific hopping band. In the case of including, a specific frequency hopping band according to the first frequency hopping code and a specific frequency hopping band according to the second frequency hopping code are provided in a discontinuous manner in the time domain.

In another aspect of the invention, a second pico base station for use in a wireless communication system comprising a first pico base station hopping using a first frequency hopping code in a first frequency band of a first time period, the radio signal RF unit for transmitting and receiving; And a processor coupled to the RF unit, the processor configured to control the RF unit, wherein the processor is configured to frequency hop a transmitting signal using a second frequency hopping code in a first frequency band of the second time period. A pico base station apparatus is provided wherein a first time period and a second time period are discontinuous.

In another aspect of the invention, a terminal for receiving a signal in a wireless communication system, RF terminal for transmitting and receiving a wireless signal; And a processor coupled to the RF unit and configured to control the RF unit, wherein the processor controls the RF unit to receive a signal hopping from a first pico base station according to a first frequency hopping code, and a second frequency hopping code. The RF unit is controlled to receive a signal hopping from the second pico base station, and when the first frequency hopping code and the second frequency hopping code include the same specific frequency hopping band, The specific frequency hopping band and the specific frequency hopping band according to the second frequency hopping code are discontinuously present in the time domain.

Advantageously, said first frequency hopping code and said second frequency hopping code are generated based on a Galois Field.

Preferably, the first frequency hopping code or the second frequency hopping code is provided by one of the following rows of the matrix.

Figure pat00060

Here, C and D are matrices generated from the galoa field, and C ( odd i ) and C ( even i ) are the i-th element of the matrix C ( odd ) and C , respectively , which are composed of only the odd-numbered terms of C. Is the i-th element of the matrix C ( even ) consisting of only even-numbered terms of. D (oddi), D (eveni) is the i-th element of the matrix D (even) consisting of only the i-th elements and even-numbered, wherein the elements of the D matrix D (odd) made of only odd-numbered wherein the elements of the D, respectively to be. p is prime, I = [1 1 1 1... 1 p -1 ], σ = 1,2,... , p -2 , k , φ = 1,2,... , p -1, M are the frequency bands to jump to.

Preferably, a frequency hopping code where p is 11 is provided by the following matrix.

Figure pat00061

The system applying all the frequency hopping codes used in the embodiment of the present invention can also solve the interference problem of the multipath wave that may exist between the multiple piconets.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
1 is a time band graph of a transmission signal of a TH CR-UWB system.
2 is a diagram illustrating a pulse train generated by a time hopping code.
3 is a diagram illustrating a ray and a cluster.
FIG. 4 is a diagram illustrating average power of Rays and Clusters which decrease exponentially.
FIG. 5 (a) is a diagram illustrating 100 impulse response models of LOS 4m.
FIG. 5 (b) is a diagram illustrating an impulse response model of a specific one of 100 LOS 4m.
FIG. 5 (c) is a diagram illustrating 100 impulse response models of NLOS 4m.
FIG. 5 (d) shows an impulse response model of a specific one of 100 NLOS 4m. FIG.
FIG. 5 (e) is a diagram showing 100 impulse response models of LOS 10m.
FIG. 5 (f) is a diagram showing an impulse response model of a specific one of 100 LOS 10m.
5 (g) is a diagram illustrating 100 impulse response models of NLOS 10m.
FIG. 5 (h) is a diagram illustrating an impulse response model of a specific one of 100 NLOS 10m.
6, 7 and 8 illustrate existing frequency hopping codes.
9 and 10 illustrate an example of piconet interference, which is a problem in the existing frequency hopping code.
11 is an embodiment to which the present invention is applied according to a frequency hopping sequence M that is strong against multipath waves.
12 is a block diagram illustrating an apparatus for supporting an operation of a multiple piconet system using a frequency hopping code according to an embodiment of the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, those skilled in the art will appreciate that the present invention may be practiced without these specific details.

A transmission signal of a general multi-band frequency hopping (MB-FH) multi-band UWB can be represented by Equation 3 by using a complex baseband signal notation.

Figure pat00062

R k ( t ) represents the k- th complex baseband signal existing during the interval from 0 to T Pluse . N represents the number of pulses, f k represents the center frequency of the k- th frequency band. The modulation scheme of a multi-band UWB system uses a binary phase shift key (BPSK) or quadrature phase shift key (QPSK). The non-return-to-zero (NRZ) data string d k to be transmitted may be represented by Equation 4 by a pulse, where T c = 2 T is a value corresponding to a bit period.

Figure pat00063

d ( t ) passes through the serial-to-parallel converter and the two NRZ data columns d l ( t )

Figure pat00064
QPSK modulation is performed separately from each other. In this case, the modulated signal may be represented as in Equation 5.

Figure pat00065

In Equation 5, f c represents a center frequency allocated to frequency hopping among a plurality of divided frequency bands. Signal in the form of a (t) in equation (5) is a pulse, and this is of g R (t) has a very broad frequency bandwidth and the even termination extremely carrier is multiplied by the short UWB signal having a time width of the pulse between the baseband signal Only the change in the center frequency and the shape of the pulse change, but still maintain the pulse shape with a time width of less than 4 nsec. Equation 5 represents an infinite series of pulses, and these pulses have a frequency band determined according to a predetermined frequency hopping pattern. The period in which this frequency hopping pattern is repeated is represented by T b , which is called a code duration. N pulse codes are repeatedly transmitted in accordance with a predetermined jump pattern. If one pulse of a specific time is b q, c (t), S ( t ) can be expressed as in Equation 6.

Figure pat00066

If the frequency hopping pattern is [0,2,4,6,1,3,5,7], N = 8, for example, when c = 0, pulses of frequency band 0 are transmitted in the first T c section. If c = 1, a pulse of frequency band 2 is transmitted in the second T c interval.

2 is a diagram illustrating a pulse train generated by a frequency hopping code. Referring to FIG. 2, the pulse train of Equation 5 transmitted by a specific frequency hopping pattern is shown. In the mobile communication channel, since there are many multi-path components reaching one bin, the Gaussian distribution is obtained by the central limit theorem, so the amplitude characteristics are generally not line-of-sight. The case follows the Rayleigh distribution. However, since CR-UWB uses very short pulses, it is inappropriate to model Rayleigh channels because the number of multipath components arriving is smaller than that of mobile communication systems.

When modeling based on actual measurements, the amplitude of the multipath component follows a log-normal distribution and models the clustering of the arrival signal. Clustering is a phenomenon in which arrival signals arrive in a grouped manner in time rather than completely irregular arrival time characteristics of signals arriving in a very complex indoor wireless channel environment. It is inappropriate to model with the Poisson process represented by the parameter λ of. Therefore, modeling should be performed by adding clustering phenomenon of the arrival signal. The amplitude magnitude of the cluster decreases with an exponential function over time, and the amplitude magnitude of Ray in the cluster also decreases with an exponential function. Since UWB transmit pulses are received irregularly through multiple paths, mathematical modeling of the arrival time is required when expressing an impulse response. The arrival time of the cluster and the arrival of the ray in the cluster are required. Time is represented by two independent Poisson processes, each with a mean arrival rate of Λ and λ ( λ >> Λ). l represents the arrival time of the first cluster (Cluster) to T l, l represents the arrival time of the first cluster (Cluster) k th ray (Ray) to τ k, l. In addition, T l and τ k, l may be expressed as mutually independent exponential probability density functions such as Equations 7 and 8.

Figure pat00067

Figure pat00068

On the other hand, the impulse response of the channel can be expressed as shown in equation (9).

Figure pat00069

In Equation 9, { X i } represents shadowing and is modeled as a log-normal distribution having a standard deviation of σ x .

3 is a diagram illustrating a ray and a cluster.

Referring to Figure 3,

Figure pat00070
Is a multipath gain constant for the k th ray of the l th cluster, which is given by Equation (9). Index i is a realization number that implements a total of 100 channel impulse response models, which accommodates only 90 of the best performances among 100 models when evaluating transmit / receive bit error rate (BER) performance per Eb / No. do. The fading of the l- th cluster and the k- th ray of the cluster is represented by ξ l and β k, l , respectively, where the inversion of the signal due to reflection (+1, -1) is represented by p. It is represented by k, l . It is assumed that they have a distribution as in Equation 10.

Figure pat00071

In Equation 10, μ k, l, which is a mean of a normal distribution , is given by Equation 11.

Figure pat00072

The multipath gain constant is given by Equation 12.

Figure pat00073

On the other hand, the squared mean value of α k, l is as shown in Equation 13, and becomes a function as shown in FIG. FIG. 3 shows the average power of Rays and Clusters which decrease exponentially.

Figure pat00074

Where Ω 0 is the average power for the first ray of the first cluster and is the value for normalizing the total received power. Γ is the cluster attenuation coefficient, γ is the Ray attenuation coefficient. In addition, the average power of Ray and Cluster takes into account the actual power available to power dropping by 10dB from the power of the straight path component.

FIG. 5A is a diagram illustrating 100 impulse response models of 4m LOS (Line-Of-Sight). FIG. 5B is a diagram showing an impulse response model of a specific one of 100 LOS 4m. FIG. 5C is a diagram illustrating 100 impulse response models of NLOS 4m. FIG. 5D is a diagram illustrating an impulse response model of a specific one of 100 that is NLOS (Non-Line-Of-Sight) 4m. FIG. 5E shows 100 impulse response models of LOS 10m. FIG. 5 (f) is a diagram illustrating an impulse response model of a specific one of 100 LOS 10m. FIG. 5G is a diagram illustrating 100 impulse response models of NLOS 10m. FIG. 5 (h) shows an impulse response model of a specific one of 100 NLOS 10m. Referring to FIG. 5, in the case of CR-UWB, the time-base pulse width is determined from several nanoseconds to several tens of nanoseconds by the frequency bandwidth that can be allocated. Therefore, since the effective power in the CR-UWB channel environment described above is viewed as power falling from the power of the straight path component to 10 dB, the following multipath wave avoidance technique will be the basis for the significant effect.

6, 7 and 8 illustrate existing frequency hopping codes.

6, 7, and 8 in the case of the existing communication system, the user and the piconet or cell is distinguished by the frequency hopping code. In Figures 6, 7, and 8, the rows of the matrix represent piconets or users, the columns represent time, and each element of the matrix represents the frequency band to be hopped. That is, by jumping to different frequency bands at the same time, the piconet or the user can coexist.

9 and 10 illustrate an example of interference between piconets, which is a problem in the existing frequency hopping code.

In the case of the existing frequency hopping code, as shown in FIG. 9, the frequency hopping code is used for distinguishing a user and a piconet or a cell, and the related measures are not applied to the frequency hopping code itself for the multipath wave. In the case of multiple users and piconets that used frequencies 1,2,3,4,5,6 at the same time as in FIG. 9, when a multipath wave occurs, 2,4,6, Interfering effects will occur on 1,3,5 frequency users and piconets.

In the case of FIG. 10, the frequency band used at the same time by the multipath wave also has an interference effect on the frequency band used at the next time. For example, referring to FIG. 10, when piconet 3 jumps to a frequency band of 13 at a time of 1, a frequency band of 13 is used by piconet 7 at a time of just two consecutive times. As such, when different piconets hop using the same frequency band, the hopping points may be continuous. In this case, the frequency band 13 used next time may be affected by Piconet 7 by Piconet 3. Therefore, the complexity of the receiver increases to solve the problem of many multipath waves due to the indoor environment.

In addition, a technique of avoiding multipath waves by deliberately increasing the pulse transmission time interval has been considered, but in this case, the transmission speed has a disadvantage.

The present invention is intended to reduce the influence of interference caused by the frequency band used at the same time by the multipath wave to the frequency band used at the next time. In order to reduce the interference caused by the multipath, a method of changing the frequency hopping code to prevent jumping to the same frequency band in a continuous time is proposed.

The frequency hopping code of the present invention is composed of a part generating seed matrices C and D and a part generating m matrix M , which is a frequency hopping code, using the seed matrices C and D. It is.

The frequency hopping code resistant to the multipath wave proposed in the present invention is generated by Equation 14, Equation 15, Equation 16, Equation 17, Equation 18 and Equation 19, Table 1 as the matrix M. In the following, prime refers to a prime number.

Figure pat00075

Figure pat00076

Figure pat00077

Figure pat00078

Figure pat00079

Figure pat00080

Figure pat00022

Here, GF of Equation 14, Equation 15, Equation 16, and Equation 17 represents a Galois Field. Referring to Table 1, p is a prime number and δ is a primitive of GF ( p ). (primitive) The smallest element of the elements that can be formed in the form of α power, which is also a prime number, and α represents the power. The element δ α of the set represented by the power multipliers of these primitive elements is also an element of GF ( p ). δ α can be determined by the remainder divided by P. However, * α δ is organized in ascending order in order to set the resulting value of δ α, δ ˚ α is set, the result of the theorem δ α in the descending order of the car. In Equation 14, the result of each power value in α power form is arranged in ascending order, and the seed matrix S as shown in Equation 16 can be obtained by taking the logarithm of δ below each element. have. In addition, if each logarithm of each result value in the form of α power in Equation 16 is arranged in descending order, and the logarithm of δ below is obtained for each element, a seed matrix N is obtained as shown in Equation 18. Can be. However, C (oddi) refers to the i th element of matrix C (odd) consisting of an odd-numbered term in the matrix C, C (eveni) denotes the i th element of matrix C (even) composed of even-numbered wherein . In addition, D (oddi) refers to the i th element of the matrix D (odd) consisting of an odd-numbered term in matrix D, D (evevi) denotes the i th element of the matrix D (even) consisting of the even terms. For example, in the case of GF (11) with the above formula, frequency hopping code M is generated.

Figure pat00081

Figure pat00082

Figure pat00083

Figure pat00084

Figure pat00085

Figure pat00086

Figure pat00087

Figure pat00088

Referring to Equation 27, the frequency hopping code M is also distinguished from the user and the piconet or cell by the frequency hopping code. The rows of the matrix represent the piconets or users, the columns represent the time, and the elements represent the frequency bands to jump to. That is, by jumping to different frequency bands at the same time, the piconet or the user can coexist. Looking at each element of the frequency hopping code of Equation 27, the same frequency band number to be hopped at consecutive times is not located. That is, using Equation 27, since the frequency band to be hopped is not located at a continuous time, there is an advantage that the effect of interference due to the multipath can be reduced.

11 is an embodiment to which the present invention is applied according to a frequency hopping sequence M that is strong against multipath waves.

Referring to FIG. 11, the frequency hopping sequence M proposed by the present invention, as shown in FIG. 11, indicates that ROW of the matrix represents the number of piconets, columns represents time, and elements represent the frequency bands to which the hop is to be made. As shown in FIG. 11, the frequency band used at the same time is designed by using a frequency hopping code such that another piconet is not immediately used by the next time, but the frequency band is used in the next time slot after the time slot is advanced. Has the effect of being less affected by the path wave. For example, referring to FIG. 11, when Piconet 1 jumps to the frequency band of 0 at the time of 1, the frequency band of 0 is not used immediately, and the frequency band of 0 at the time of 3 after one time slot has elapsed. This is used by Piconet 4. As such, when different piconets hop using the same frequency band, the next hop time may construct a matrix of frequency hopping codes such that they are discontinuous in the time domain.

In addition, since all users or piconets use 20 frequency bands equally, frequency selective fading according to broadband frequencies is equally applied. When the frequency hopping code proposed in the present invention is used, the complexity of the receiver is reduced, and the problem of the degradation of the transmission rate in the pulse delay transmission scheme for avoiding multipath waves in the conventional technology can be solved.

12 is a block diagram illustrating an apparatus for supporting an operation of a multiple piconet system using a frequency hopping code according to an embodiment of the present invention.

Referring to FIG. 12, an apparatus according to an embodiment of the present invention includes a processor 100, a transmitter 200, a receiver 300, and a memory 400. The processor 100 processes the data received through the receiver 200. The processor 100 analyzes the frequency hopping pattern of the received signal and synchronizes it. The received signal may include a signal at a neighboring piconet as well as a signal at a corresponding piconet. In the case of a first pico base station, the processor 100 may frequency-hop a signal transmitted by the first pico base station using a first frequency hopping code in a first frequency band of a first time period.

In the case of the second pico base station, the processor 100 may frequency-hop the signal transmitted by the second pico base station using a second frequency hopping code in the second frequency band of the first time period. The first frequency band and the second frequency band are discontinuous. That is, the code information necessary for encoding data in the operation unit 230 of the transmitter 200 is changed and notified. The memory 400 stores the frequency hopping code and the reconstructed frequency code synchronized by the processor 100.

The transmitter 200 and the receiver 300 of the present invention include an RF unit, a frequency hopping code generator, and a calculator. The RF units 210 and 310 receive a signal transmitted from another terminal forming the piconet or transmit a signal to another terminal. Frequency hopping codes refer to Equations 14 to 19 for the process and structure of the matrix M. The operation unit encodes data to be transmitted by the RF unit using the hopping code, or decodes a signal received by the RF unit using the hopping code and extracts data that the processor 100 can process. Do this. The receiver 300 may further include a synchronization extractor.

As mentioned above, although preferred embodiments of the present invention have been described in detail, those of ordinary skill in the art to which the present invention pertains should realize the present invention without departing from the spirit and scope of the present invention as defined in the appended claims. It will be appreciated that various modifications or changes can be made. The above embodiments should be understood only as a technical concept, and should not be construed as being limited thereto. Accordingly, the scope of the present invention is not limited by the specific embodiments, but is determined by the claims, and modifications of future embodiments of the present invention will not depart from the technology of the present invention.

Claims (16)

In the method of operating multiple pico base station in a wireless communication system,
Frequency hopping, by the first pico base station, a signal transmitted by the first pico base station using a first frequency hopping code in a first frequency band of a first time period; And
And the second pico base station frequency hopping a signal transmitted by the second pico base station using a second frequency hopping code in the first frequency band of a second time period,
And wherein the first time period and the second time period are discontinuous. The method of claim 1,
Wherein the first frequency hopping code and the second frequency hopping code are generated based on a Galois field. The method of claim 1, wherein the first frequency hopping code or the second frequency hopping code is performed by one of the following rows of a matrix:
Figure pat00089

Here, C and D are matrices generated from the galoa field, and C ( odd i ) and C ( even i ) are the i-th element of the matrix C ( odd ) and C , respectively , which are composed of only the odd-numbered terms of C. Is the i-th element of the matrix C ( even ) consisting of only even-numbered terms of.
D (oddi), D (eveni) is the i-th element of the matrix D (even) consisting of only the i-th elements and even-numbered, wherein the elements of the D matrix D (odd) made of only odd-numbered wherein the elements of the D, respectively to be. p is prime, I = [1 1 1 1... 1 p -1 ], σ = 1,2,... , p -2 , k , φ = 1,2,... , p -1, M are the frequency bands to jump to. The method of claim 3, wherein
The frequency hopping code where p is 11 is performed by the following matrix:
Figure pat00090
 In a method for receiving a signal in a wireless communication system,
Receiving a signal hopping from the first pico base station according to the first frequency hopping code; And
Receiving a signal hopping from a second pico base station according to a second frequency hopping code that is different from the first frequency hopping code,
When the first frequency hopping code and the second frequency hopping code include the same specific frequency hopping band, the specific frequency hopping band according to the first frequency hopping code and the specific frequency hopping band according to the second frequency hopping code A method that exists discontinuously in the time domain. The method of claim 5, wherein
Wherein the first frequency hopping code and the second frequency hopping code are generated based on a Galois field. 6. The method of claim 5, wherein the first frequency hopping code or the second frequency hopping code is performed by one of the following rows of a matrix:
Figure pat00091

Here, C and D are matrices generated from the galoa field, and C ( odd i ) and C ( even i ) are the i-th element of the matrix C ( odd ) and C , respectively , which are composed of only the odd-numbered terms of C. Is the i-th element of the matrix C ( even ) consisting of only even-numbered terms of.
D (oddi), D (eveni) is the i-th element of the matrix D (even) consisting of only the i-th elements and even-numbered, wherein the elements of the D matrix D (odd) made of only odd-numbered wherein the elements of the D, respectively to be. p is prime, I = [1 1 1 1... 1 p -1 ], σ = 1,2,... , p -2 , k , φ = 1,2,... , p -1, M are the frequency bands to jump to. The method of claim 7, wherein
The frequency hopping code where p is 11 is performed by the following matrix:
Figure pat00092
 A second pico base station for use in a wireless communication system comprising a first pico base station hopping using a first frequency hopping code in a first frequency band of a first time period,
An RF unit for transmitting and receiving a radio signal; And
A processor coupled to the RF unit and configured to control the RF unit,
The processor is configured to frequency hop a transmitting signal using a second frequency hopping code in a first frequency band of the second time period,
And the first time period and the second time period are discontinuous. The method of claim 9,
Wherein the first frequency hopping code and the second frequency hopping code are generated based on a Galois field. 10. The pico base station of claim 9 wherein the first frequency hopping code or the second frequency hopping code is performed by one of the following rows of a matrix:
Figure pat00093

Here, C and D are matrices generated from the galoa field, and C ( odd i ) and C ( even i ) are the i-th element of the matrix C ( odd ) and C , respectively , which are composed of only the odd-numbered terms of C. Is the i-th element of the matrix C ( even ) consisting of only even-numbered terms of.
D (oddi), D (eveni) is the i-th element of the matrix D (even) consisting of only the i-th elements and even-numbered, wherein the elements of the D matrix D (odd) made of only odd-numbered wherein the elements of the D, respectively to be. p is prime, I = [1 1 1 1... 1 p -1 ], σ = 1,2,... , p -2 , k , φ = 1,2,... , p -1, M are the frequency bands to jump to. The method of claim 11,
A frequency hopping code where p is 11 is performed by the following pico base station:
Figure pat00094
 In a terminal for receiving a signal in a wireless communication system,
An RF unit for transmitting and receiving a radio signal; And
A processor coupled to the RF unit, the processor configured to control the RF unit, wherein the processor controls the RF unit to receive a signal hopping from a first pico base station according to a first frequency hopping code, and to a second frequency hopping code. The RF unit is controlled to receive a signal hopping from the second pico base station,
When the first frequency hopping code and the second frequency hopping code include the same specific frequency hopping band, the specific frequency hopping band according to the first frequency hopping code and the specific frequency hopping band according to the second frequency hopping code Discontinuously in the time domain,
Terminal. The method of claim 13,
Wherein the first frequency hopping code and the second frequency hopping code are generated based on a Galois field.
Terminal. 15. The method of claim 14,
Wherein the first frequency hopping code or the second frequency hopping code is performed by one of the following rows of a matrix:
Figure pat00095

Here, C and D are matrices generated from the galoa field, and C ( odd i ) and C ( even i ) are the i-th element of the matrix C ( odd ) and C , respectively , which are composed of only the odd-numbered terms of C. Is the i-th element of the matrix C ( even ) consisting of only even-numbered terms of.
D (oddi), D (eveni) is the i-th element of the matrix D (even) consisting of only the i-th elements and even-numbered, wherein the elements of the D matrix D (odd) made of only odd-numbered wherein the elements of the D, respectively to be. p is prime, I = [1 1 1 1... 1 p -1 ], σ = 1,2,... , p -2 , k , φ = 1,2,... , p -1, M are the frequency bands to jump to. The method of claim 15,
The frequency hopping code where p is 11 is performed by the following matrix:
Figure pat00096
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Publication number Priority date Publication date Assignee Title
US10305539B2 (en) 2016-07-19 2019-05-28 Samsung Electronics Co., Ltd. Electronic apparatus and controlling method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10305539B2 (en) 2016-07-19 2019-05-28 Samsung Electronics Co., Ltd. Electronic apparatus and controlling method thereof

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