Electronics and Telecommunications Research Institute

Ki Chul Han

Seung Chan Bang

Tae Joong Kim

Jung Im Kim

Jae Ryong Shim

Woo Young Lee

Hyun Kyu Chung

Jin Kyeong Kim

Sung Geun Jin

Song In Choi

Byung Jae Kwak

Won Myoung Lee

Seung Chang Bang

A method and system for communicating between devices according to the present invention are provided. The method for communicating between the devices according to the present invention is used for communicating with a first terminal, and is carried out in a device having a capacitive touch screen. The method includes: detecting a change in capacitance for a specific part of the capacitive touch screen, which occurs by means of the first terminal; and acquiring information transferred from the first terminal on the basis of the detected change in capacitance of the capacitive touch screen. The communicating method using such a touch screen may be easily used for various services such as authenticating terminals or transferring files between local terminals.

Method and system for communicating between devices

An apparatus for making a plurality of terminals have a random access to the reverse common channel system in CDMA, comprises code synchronization detection information broadcast means provided in the base station for broadcasting the state information of a channel card in real time for the terminals to recognize the code synchronization detection when the code synchronization of a certain data is acquired through performing the code synchronization of the preambles transmitted from the terminals through the reverse common channel, and data transmission determination means provided in the terminals for making the terminals to have attempted data transmission in the same time slot with the data of the code synchronization detection continuously transmit data and the other terminals stop data transmission.

Apparatus for making a random access to the reverse common channel of a base station in CDMA and method therefor

An orthogonal complex spreading method for a multichannel and an apparatus thereof are disclosed. The method includes the steps of complex-summing &#x3b1;WXwhich is obtained by multiplying an orthogonal Hadamard sequence Wby a first data Xof a n-th block and &#x3b1;WXwhich is obtained by multiplying an orthogonal Hadamard sequence Wby a second data Xof a n-th block; complex-multiplying &#x3b1;WX+j&#x3b1;WXwhich is summed in the complex type and W+jPWof the complex type using a complex multiplier and outputting as an in-phase information and quadrature phase information; and summing only in-phase information outputted from a plurality of blocks and only quadrature phase information outputted therefrom and spreading the same using a spreading code.

Orthogonal complex spreading method for multichannel and apparatus thereof

An apparatus for making a plurality of terminals have a random access to the reverse common channel system in CDMA, comprises code synchronization detection information broadcast means provided in the base station for broadcasting the state information of a channel card in real time for the terminals to recognize the code synchronization detection when the code synchronization of a certain data is acquired through performing the code synchronization of the preambles transmitted from the terminals through the reverse common channel, and data transmission determination, means provided in the terminals for making the terminals to have attempted data transmission in the same time slot with the data of the code synchronization detection continuously transmit data and the other terminals stop data transmission.

There is disclosed an echo cancelling apparatus in a digital mobile communication system and method thereof, which is incorporated in a single chip together with a speech coder, and can improve convergence rate by using an excited signal as an input to n adaptive filter and also obtain a stabilized convergence characteristic while using a NLMS algorithm. The echo canceller according to the present invention uses the excited signal obtained at the speech coder as an input signal to an adaptive filter thereby to lower the Eigenvalues distribution rate of the speech signal, thus providing an improved performance compared to the conventional echo canceller.

Echo cancellation apparatus in a digital mobile communication system and method thereof

An orthogonal complex spreading method for a multichannel and an apparatus thereof are disclosed. The method includes the steps of complex-summing &agr; W X which is obtained by multiplying an orthogonal Hadamard sequence W by a first data X of a n-th block and &agr; W X which is obtained by multiplying an orthogonal Hadamard sequence W by a second data X of a n-th block; complex-multiplying &agr; W X &plus;j&agr; W X which is summed in the complex type and W &plus;jPW of the complex type using a complex multiplier and outputting as an in-phase information and quadrature phase information; and summing only in-phase information outputted from a plurality of blocks and only quadrature phase information outputted therefrom and spreading the same using a spreading code.

An orthogonal complex spreading method for a multichannel and an apparatus thereof are disclosed. The method includes the steps of complex-summing &agr;,W,X,which is obtained by multiplying an orthogonal Hadamard sequence W,by a first data X,of a n-th block and &agr;,W,X,which is obtained by multiplying an orthogonal Hadamard sequence W,by a second data X,of a n-th block; complex-multiplying &agr;,W,X,&plus;j&agr;,W,X,which is summed in the complex type and W,&plus;jPW,of the complex type using a complex multiplier and outputting as an in-phase information and quadrature phase information; and summing only in-phase information outputted from a plurality of blocks and only quadrature phase information outputted therefrom and spreading the same using a spreading code.

Growing community of inventors

Daejeon, South Korea

Ki Chul Han