Patent
to AU-KBC
Patent Title:
Multiuser
Indoor Wireless Access Methods and Systems Based on the OFDM
Transmission Technique
Inventors: S. Srikanth, R. Venkatesh, S.
Karthikeyan, and P. Arun
Abstract:
We
have presented a new power-efficient multi-user indoor wireless
system based on the OFDM transmission technique on the downlink.
In the new system subcarrier and modulation mode are allocated
such that the bit-rate and bit-error rate requirements of
all the active users are simultaneously satisfied. Such a
system is expected to be valuable in wireless multimedia communications
where high-speed downlink access is extremely important. Power
and bandwidth are two valuable resources in communications
and the new system allocates these resources in an efficient
manner. To our knowledge, there are no schemes which have
been presented to allocate resources in such an efficient
manner while taking care of the user requirements. Results
presented using simulations clearly illustrate the performance
advantages of the new scheme when compared with other schemes.
Date of Award : 23rd Feb. 2006
Patent No : 198873
Patent Title:
Methods and systems for synchronizing wireless transmission of data packets
Inventors: S. Srikanth, Sathish Viswanathan
Abstract:
Methods and systems for synchronizing wireless transmission of data packets is provided. Signals having a data packet frame format including a preamble (with a pattern of symbol sequences) and data are received, and patterns of symbol sequences are correlated. A first metric can be calculated that is a ratio of an average of the correlation values and an average of a power of the signals. A second metric can be calculated that defines an average of a power of noise in the signals. The methods include determining an approximate division of the preamble and data in the data packet of each signal based on the first and second metrics. The methods further include determining a cross-correlation between versions of a transmitted signal to produce a number of peaks equal to a number of transmit antennas, generating a third metric based on combinations of cross-correlations, and identifying a position of a maximum peak within the third metric as a fine timing offset amount.
Date of Award : 5th April. 2011
Patent No : 7920599
