Electronics and Telecommunications Research Institute

Ki-Chul Han

Tae-Joong Kim

Jung-Im Kim

Duck-Bin Im

In-Myoung Jeong

Sang-Cheon Lee

Hyun Woo Lee

Seung-Chan Bang

Seung Chan Bang

Ki-Hong Kim

Jae Ryong Shim

Jae-Ryong Shim

Min-Sik Seo

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 improved CDMA mobile automatic call simulating method and a simulator therefor which are capable of computing an accurate statistic data by repeating an actual CDMA call attempt and call incoming and by judging the result of the call attempt, which includes a management unit for communicating with the mobile stations and controlling the same in accordance with a previously set protocol, and a connection unit for communicating with the management unit and the mobile stations in accordance with an SDLC in an RS-422 signal method.

CDMA mobile automatic call simulating method and simulator therefor

An automatic call simulator for simulating call processing capacity and performance between a base station and a mobile station of a CDMA mobile communication system is disclosed. A mobile station has a communication port for serial communication with an external unit. An operating unit controls all the mobile station by operating software, generates the state of each mobile station during simulation and a simulation result, and records simulation result data. An interface unit for interfacing the mobile station with the operation unit is included within a metal box so as not to be influenced by an external electromagnetic wave and has external terminals connected to the mobile station and to the operation unit. The interface unit and the mobile station are connected through the communication port.

Code division multiple access (CDMA) automatic call simulator

Growing community of inventors

Daejeon, South Korea

Ki-Chul Han