Electronics and Telecommunications Research Institute

Other

Jae Ryong Shim

Seung Chan Bang

Tae Joong Kim

Jung Im Kim

Ki Chul Han

Jae Heung Kim

Tae-Joong Kim

Jung-Im Kim

Jong Suk Chae

Hyun Seo Oh

Hyuck Lee

Bub Joo Kang

Ki-Chul Han

Eung Bae Kim

Seung-Chang Bang

Narm Hee Lee

Chae Min Park

Seung Chang Bang

A method for converting source data to a channel-modulated signal having a plurality of pairs of in-phase (I) and quadrature-phase (Q) data in a mobile station, wherein the mobile station uses at least one channel, includes the steps of: a) encoding the source data to generate at least one data part and a control part; b) generating at least one spreading code to be allocated to the channel, wherein each spreading code is selected on the basis of a data rate of the data part and the control part and spreading codes are selected so that two consecutive pairs of the I and Q data are correspondent to two points located on same point or symmetrical with respect to a zero point on a phase domain; and c) spreading the control part and the data part by using the spreading code, to thereby generate the channel-modulated signal.

Apparatus and method for modulating data message by employing orthogonal variable spreading factor (OVSF) codes in mobile communication system

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 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.

Generally, Reed-Solomon encoding process in the conventional communication system is executed by a Reed-Solomon encoder having different code rates for different data transmission rates. The present invention does not use a Reed-Solomon encoder having different coding rates, but instead uses a Reed-Solomon encoder having the same code rate regardless of data transmission rate. Accordingly, the present invention has the following effects. The present invention maintains same communication quality regarding data services having each different data transmission rate, and can use a single Reed-Solomon encoder.

Channel encoding apparatus using single concatenated encoder

Growing community of inventors

Daejeon, South Korea

Jae Ryong Shim