Orthogonal code division multiplex cck (ocdm-cck) method and apparatus for high data rate wireless lan

Abstract

Orthogonal Code Division Multiplexing (OCDM) transceiver system with Complementary Code Keying (CCK) and method for baseband OCDM-CCK encoding and decoding are provided. The OCDM-CCK method comprises a serial-to-parallel data converter converting a stream of M*n-bit serial data to n-bit parallel data in ‘M’ parallel baseband paths, and encoding each n-bit data segment with a distinct complementary code using CCK modulation for spreading. The CCK encoded baseband signals are all summed and transmitted simultaneously on the same carrier frequency and spread spectral bandwidth. The OCDM-CCK method of encoding and transmission of information, results in enhanced datarates of 33 Mbps, 88 Mbps, 176 Mbps and higher multiples of 5.5 Mbps with backward compatibility for IEEE 802.11b WLAN (Wireless Local Area Network), and wireless communication networks supporting real time Direct Sequence Spread Spectrum (DSSS).

1 . A computer program product for an encoding method, including one or more non-transitory, computer readable instructions configured to cause one or more computer processors to perform the steps of:
 encoding a stream of M*n-bit serial digital data in ‘M’ orthogonal and near-orthogonal OCDM channels;   allocating ‘n’ bits per channel and which are mapped using Complementary Coded Keying (CCK) and transmitted simultaneously on the same carrier frequency and spread spectral bandwidth, and   whereby increased datarates of 33 Mbps, 88 Mbps, 176 Mbps and integer multiples of 5.5 Mbps are achieved for systems including IEEE 802.11b WLAN (Wireless Local Area Network) and wireless communication networks supporting real time Direct Sequence Spread Spectrum (DSSS).   
     
     
         2 . The computer program product of  claim 1 , further comprising generating a set of look-up tables to store in memory a set of sequences with their designated code index representing the decoded 6-bit data segment in codelists. 
     
     
         3 . A computer program product for an Orthogonal Code Division Multiplexing CCK (OCDM-CCK) wireless transceiver receiving method, including one or more non-transitory, computer readable instructions configured to cause one or more computer processors to perform the steps of:
 receiving RF (Radio Frequency) DSSS (Direct Sequence Spread Spectrum) signals;   frequency conversion, to down-convert received RF signals to baseband frequency for Digital Signal Processing (DSP);   DSP for signal power splitting, which splits the baseband signal into a plurality of parallel channels paths;   DSP for cross correlation detection dedicated to the channel path to detect the CCK symbol present in that path by using a dedicated CCK codelist;   DSP for dedicating specific CCK codelists to each channel path for the purpose of crosscorrelation;   DSP for detection of the specific CCK symbol present in that channel path by crosscorrelation using stored CCK sequences of the said specific CCK codelist;   DSP for demodulation of CCK sequence present in each path to recover data segment in that path;   DSP for decoding the CCK sequence present in each path to recover data in each path;   DSP for recovering data segments in all the parallel paths using stored CCK look-up tables; and   DSP for converting parallel data signals to serial data signal output.