Apparatus for transmitting and receiving data to provide high-speed data communication and method thereof

Abstract

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used.

1 - 9 . (canceled) 
     
     
         10 . A transmitter having plural antennas for transmitting a two-stream signal in a wireless channel, said transmitter having transmission circuits connected to each antenna, said transmission circuits comprising:
 frame generator circuits for producing in each stream of said two-stream signal transmission frames having a preamble followed by data, wherein said frame generator circuits providing signal information symbols in said preamble, said signal information symbols indicating whether said two-stream signal is coded using space time block coding (STBC).   
     
     
         11 . The transmitter of  claim 10 , wherein said frame generator circuits further providing:
 preamble symbols representing a short preamble sequence and one or more first long preamble sequences located in said preamble before said signal information symbols, said short and first long preamble sequences enabling a receiver to perform an initial frame synchronization; and   additional preamble symbols representing one or more second long preamble sequences located in said preamble following said signal information symbols and enabling a receiver to perform a channel estimation for each channel defined by said two-stream signal.   
     
     
         12 . The transmitter of  claim 11 , wherein the short preamble sequence comprises a first sequence of time-domain signals, wherein each of the time-domain signals of the first sequence has a first duration, wherein the one or more first long preamble sequences comprise one or more second sequences of time-domain signals, wherein each of the time-domain signals of the one or more second sequences has a second duration, and wherein the first duration is shorter than the second duration. 
     
     
         13 . The transmitter of  claim 10 , wherein the signal information symbols further includes at least one of coding rate, a mapping method, and a modulation. 
     
     
         14 . The transmitter of  claim 13 , wherein said first and second long preamble sequences are generated based on a predetermined sequence. 
     
     
         15 . The transmitter of  claim 14 , wherein said second long preamble sequences include reference information for the receiver to form a channel estimate that allows the receiver to demodulate said data. 
     
     
         16 . The transmitter of  claim 15 , wherein said first long preamble sequence is preceded by a guard interval having a length of 1.6 μsec, said second long preamble sequence includes two long preambles T1, T2 wherein each of the two long preambles T1, T2 is respectively preceded by a guard interval having a length of 0.8 μsec, and said data is preceded by a guard interval having a length of 0.8 μsec.