Patent ID: 8325826
Filing Date: 2012-12-04
Classification: H04L

Abstract:
1. A method of operating a base station to transmit information using a plurality of tones, the method comprising: transmitting during a first time period information on said plurality of tones using a first coding scheme, said plurality of tones being used in parallel; and transmitting information using said plurality of tones in parallel during a second time period using a second coding scheme which is different from said first coding scheme, said second coding scheme being a coding scheme that does not require channel information derived by a signal of a time period priori to said second time period at a decoder to decode the transmitted information, wherein said first coding scheme uses coherent modulation which requires communications channel estimation to recover information transmitted using said first coding scheme; and wherein said second coding scheme uses self supporting modulation scheme which does not require a communications channel estimate derived from signal in a time period priori to said second time period for the recovery of information, wherein the self supporting modulation scheme is a coherent modulation scheme and includes transmitting a greater number of pilot tones per symbol time period in said second time period than in said first time period, and wherein said pilot tones are transmitted in the second period of time.