Codes and preambles for single carrier and ofdm transmissions

Abstract

Certain aspects of the present disclosure relate to a method for generating a frame structure suitable for use in both single carrier (SC) and Orthogonal Frequency Division Multiplexing (OFDM) transmission modes, while ensuring accurate channel estimation at a receiver.

1 . A method for wireless communications, comprising:
 receiving a channel estimation (CE) field transmitted over a wireless channel, wherein the CE field was constructed by using a pair of Golay complementary codes;   processing the received CE field by using a matched filter associated with the pair of Golay complementary codes to obtain a first filter output and a second filter output; and   estimating the wireless channel by combining the first and second filter outputs.   
     
     
         2 . The method of  claim 1 , wherein estimating the wireless channel comprises:
 combining a fast Fourier transform (FFT) of the first filter output and a FFT of the second filter output.   
     
     
         3 . An apparatus for wireless communications, comprising:
 a receiver configured to receive a channel estimation (CE) field transmitted over a wireless channel, wherein the CE field was constructed by using a pair of Golay complementary codes;   a processor configured to process the received CE field by using a matched filter associated with the pair of Golay complementary codes to obtain a first filter output and a second filter output; and   an estimator configured to estimate the wireless channel by combining the first and second filter outputs.   
     
     
         4 . The apparatus of  claim 3 , wherein the estimator is also configured to combine a fast Fourier transform (FFT) of the first filter output and a FFT of the second filter output. 
     
     
         5 . An apparatus for wireless communications, comprising:
 means for receiving a channel estimation (CE) field transmitted over a wireless channel, wherein the CE field was constructed by using a pair of Golay complementary codes;   means for processing the received CE field by using a matched filter associated with the pair of Golay complementary codes to obtain a first filter output and a second filter output; and   means for estimating the wireless channel by combining the first and second filter outputs.   
     
     
         6 . The apparatus of  claim 5 , wherein the means for estimating the wireless channel comprises:
 means for combining a fast Fourier transform (FFT) of the first filter output and a FFT of the second filter output.   
     
     
         7 . A computer-program product for wireless communications, comprising a computer-readable medium comprising instructions executable to:
 receive a channel estimation (CE) field transmitted over a wireless channel, wherein the CE field was constructed by using a pair of Golay complementary codes;   process the received CE field by using a matched filter associated with the pair of Golay complementary codes to obtain a first filter output and a second filter output; and   estimate the wireless channel by combining the first and second filter outputs.   
     
     
         8 . A wireless node, comprising:
 at least one antenna;   a receiver configured to receive via the at least one antenna a channel estimation (CE) field transmitted over a wireless channel, wherein the CE field was constructed by using a pair of Golay complementary codes;   a processor configured to process the received CE field by using a matched filter associated with the pair of Golay complementary codes to obtain a first filter output and a second filter output; and   an estimator configured to estimate the wireless channel by combining the first and second filter outputs.