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:
 generating a preamble comprising a channel estimation (CE) field, wherein the CE field comprises a pattern being defined from a pair of Golay complementary codes;   pre-pending the preamble to a data payload; and   transmitting a packet having the preamble and the data payload therein.   
     
     
         2 . The method of  claim 1 , wherein the generation comprises:
 selecting the pattern from a set of four defined patterns, wherein the Golay complementary codes have length of 128 chips and wherein the CE field enables channel estimation over a duration of 256 chips.   
     
     
         3 . The method of  claim 1 , wherein the generation comprises:
 selecting the pattern from a set of sixteen defined patterns, wherein the Golay complementary codes have length of 128 chips and wherein the CE field enables channel estimation over a duration of 512 chips.   
     
     
         4 . The method of  claim 1 , wherein the preamble comprises a synchronization (SYNC) field being generated from the pair of Golay complementary codes. 
     
     
         5 . An apparatus for wireless communications, comprising:
 a generator configured to generate a preamble comprising a channel estimation (CE) field, wherein the CE field comprises a pattern being defined from a pair of Golay complementary codes;   a circuit configured to pre-pend the preamble to a data payload; and   a transmitter configured to transmit a packet having the preamble and the data payload therein.   
     
     
         6 . The apparatus of  claim 5 , wherein the generator is also configured to:
 select the pattern from a set of four defined patterns, wherein the Golay complementary codes have length of 128 chips and wherein the CE field enables channel estimation over a duration of 256 chips.   
     
     
         7 . The apparatus of  claim 5 , wherein the generator is also configured to:
 select the pattern from a set of sixteen defined patterns, wherein the Golay complementary codes have length of 128 chips and wherein the CE field enables channel estimation over a duration of 512 chips.   
     
     
         8 . The apparatus of  claim 5 , wherein the preamble comprises a synchronization (SYNC) field being generated from the pair of Golay complementary codes. 
     
     
         9 . An apparatus for wireless communications, comprising:
 means for generating a preamble comprising a channel estimation (CE) field, wherein the CE field comprises a pattern being defined from a pair of Golay complementary codes;   means for pre-pending the preamble to a data payload; and   means for transmitting a packet having the preamble and the data payload therein.   
     
     
         10 . The apparatus of  claim 9 , wherein the generation comprises:
 means for selecting the pattern from a set of four defined patterns, wherein the Golay complementary codes have length of 128 chips and wherein the CE field enables channel estimation over a duration of 256 chips.   
     
     
         11 . The apparatus of  claim 9 , wherein the generation comprises:
 means for selecting the pattern from a set of sixteen defined patterns, wherein the Golay complementary codes have length of 128 chips and wherein the CE field enables channel estimation over a duration of 512 chips.   
     
     
         12 . The apparatus of  claim 9 , wherein the preamble comprises a synchronization (SYNC) field being generated from the pair of Golay complementary codes. 
     
     
         13 . A computer-program product for wireless communications, comprising a computer-readable medium comprising instructions executable to:
 generate a preamble comprising a channel estimation (CE) field, wherein the CE field comprises a pattern being defined from a pair of Golay complementary codes;   pre-pend the preamble to a data payload; and   transmit a packet having the preamble and the data payload therein.   
     
     
         14 . A wireless node, comprising:
 at least one antenna;   a generator configured to generate a preamble comprising a channel estimation (CE) field, wherein the CE field comprises a pattern being defined from a pair of Golay complementary codes;   a circuit configured to pre-pend the preamble to a data payload; and   a transmitter configured to transmit via the at least one antenna a packet having the preamble and the data payload therein.