Patent ID: 8315151
Filing Date: 2012-11-20
Classification: H04L,H04W

Abstract:
1. A method of operating an OFDM communication system, further comprising a transmitting station and a receiving station, comprising at the transmitting station transmitting a plurality of symbols of a data signal, a subset of the symbols of the data signal are being added to symbols of a predetermined signal prior to IFFT conversion and transmission; said method further being characterized in that a pattern of pilot symbols is superimposed on an OFDM data signal, whereby the pilot symbols are superimposed on only a predetermined subset of the symbols on a predetermined subset of the OFDM subcarriers, and the superimposition is carried out using a configurable weighting parameter allowing a pilot-to-data transmit power ratio to be adjusted in the symbols containing superimposed pilot symbols; said superimposition using a configurable weighting parameter is based on the addition of a known pilot sequence p(n), onto data to be transmitted d(n) in order to generate a compound symbol defined in accordance with the formula: with where parameter ρ controls the amount of power allocated to the pilot signal, or Pilot-to-Signal power Ratio (PSR), and wherein said weighted combination is further based on a function of one or more of the following: transmitted data rate, quality of service requirements for the transmitted data, type of transmitted data, instantaneous radio channel quality, average radio channel quality, coherence time of the radio channel, coherence bandwidth of the radio channel, available transmit power of the transmitting station, or decoding capability of the receiving station.