Method and apparatus for generating and transmitting code sequence in a wireless communication system

Abstract

A method of generating a code sequence in a wireless communication system is disclosed. More specifically, the method includes recognizing a desired length of the code sequence, generating a code sequence having a length different from the desired length, and modifying the length of the generated code sequence to equal the desired length. Here, the step of modifying includes discarding at least one element of the generated code sequence or inserting at least one null element to the generated code sequence.

What is claimed is: 
     
       1. A method for transmitting a synchronization channel (SCH) signal by generating a code sequence in a wireless communication system, the method comprising:
 generating a first code sequence (C 1 ) having a first length by using a first variable (M 1 );   generating a second code sequence (C 2 ) having a second length by using a second variable (M 2 ), wherein the M 1  and the M 2  are different from each other;   generating the code sequence as a combination of the first code sequence (C 1 ) and the second code sequence (C 2 ); and   transmitting the code sequence as the SCH signal,   wherein at least one of the first length and the second length is a prime number length, and the sum of the first length and the second length corresponds to a length of the SCH signal,   wherein the combination of the first code sequence (C 1 ) and the second code sequence (C 2 ), each of which is generated using the different variables, provides a receiving end device with information about a cell identification and a location of the SCH within a radio frame.   
     
     
       2. An apparatus for transmitting a synchronization channel (SCH) signal by generating a code sequence in a wireless communication system, the apparatus comprising:
 a code sequence generating module for generating a first code sequence (C 1 ) having a first length by using a first variable (M 1 ), generating a second code sequence (C 2 ) having a second length by using a second variable (M 2 ), wherein the M 1  and the M 2  are different from each other, and generating the code sequence as a combination of the first code sequence (C 1 ) and the second code sequence (C 2 ); and   a transmission module for transmitting the code sequence as the SCH signal,   wherein at least one of the first length and the second length is a prime number length, and the sum of the first length and the second length corresponds to a length of the SCH signal,   wherein the combination of the first code sequence (C 1 ) and the second code sequence (C 2 ), each of which is generated using the different variables, provides a receiving end device with information about a cell identification and a location of the SCH within a radio frame.   
     
     
       3. A method for receiving a synchronization channel (SCH) signal by using a code sequence in a wireless communication system, the method comprising:
 receiving the code sequence as the SCH signal in a form of a combination of a first code sequence (C 1 ) having a first length, which has been generated by using a first variable (M 1 ), and a second code sequence (C 2 ) having a second length, which has been generated by using a second variable (M 2 ), wherein the M 1  and the M 2  are different from each other; and   acquiring information about a cell identification and a location of the SCH within a radio frame via the combination of the first code sequence (C 1 ) and the second code sequence (C 2 ),   wherein at least one of the first length and the second length is a prime number length, and the sum of the first length and the second length corresponds to a length of the SCH signal.   
     
     
       4. A method for transmitting a synchronization channel signal by generating a code sequence in a wireless communication system, the method comprising:
 generating a first code sequence having a first length by using a first variable, wherein the first code sequence is a Zadoff-Chu CAZAC sequence;   generating a second code sequence having a second length by using a second variable, wherein the first variable and the second variable are different from each other;   generating the code sequence as a combination of the first code sequence and the second code sequence;   shifting the code sequence such that either a rear portion of the code sequence moves to a start portion of the code sequence, or a front portion of the code sequence moves to an end portion of the code sequence;   channel coding the shifted code sequence using one or more of convolution coding, turbo coding, and/or low density parity check coding to generate a channel coded signal;   modulating the channel-coded signal to generate a modulated signal;   mapping the modulated signal onto OFDM subcarriers to generate a mapped signal; and   transmitting the mapped signal including the shifted code sequence as the synchronization channel signal,   wherein at least one of the first length and the second length is a prime number length, and a sum of the first length and the second length corresponds to a length of the synchronization channel signal,   wherein the combination of the first code sequence and the second code sequence, each of which is generated using the different variables, provides a receiving end device with information about a cell identification and a location of the synchronization channel signal within a radio frame, and   wherein the synchronization channel signal is usable for one or more of initial synchronization, cell search and/or channel estimation.    
     
     
       5. The method of claim 4, further comprising multiplexing the shifted code sequence with traffic data.  
     
     
       6. The method of claim 4, wherein modulating the channel-coded signal comprises using a modulation from a set that includes quadrature phase shift keying or 16-quadriture amplitude modulation.