Loading patent…
OwnerJohn E. Hudson, Bassam M. Hasheminventors
Estimating the term…
It is becoming increasingly important to improve data throughput in wireless networks. By transmitting data simultaneously at different modulation amplitudes and/or using different code strengths, terminals having different carrier to noise ratios are able to decode the different amplitude levels with varying degrees of success. This allows distant terminals to receive low data rate transmissions at high modulation levels or code rates while nearer terminals can use additional capacity in the transmission by receiving lower level modulation signals or code rates. In this way, distant terminals do not degrade overall network performance. By arranging for terminals to acknowledge receipt of data, re-transmission at different modulation levels or code rates may be carried out by the base station in order to improve performance in the presence of noise without a priori knowledge of the carrier to noise ratio for a particular terminal.
A method of transmitting data over a communications network comprising:
A method of receiving data over a communications network, comprising:
A data-bearing signal comprising a plurality of QPSK modulated data streams combined into a single QAM transmission, the combination being made by combining each QPSK signal at progressively smaller amplitude levels.
A modulator for a transmission signal comprising:
A transmitter having:
A demodulator arranged to demodulate a signal having a plurality of data streams modulated at different respective modulation levels.
A method of transmitting data over a communications network to a plurality of terminals comprising:
A method of transmitting data over a communications network to a plurality of terminals comprising:
A receiver including a demodulator arranged to demodulate a signal having a plurality of data streams modulated in a way which provides different susceptibility to noise.
A computer program which when executed on a suitable receiver in a network causes the receiver to:
A computer program which when executed on a suitable transmitter in a network causes the transmitter to:
Dependencies are inferred from the claim text.