Data transmitting/receiving apparatus and method in wireless system
AssigneeLG Electronics Inc.
InventorJik-Dong Kim
Life of this patent
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Abstract
A data transmitting/receiving apparatus and method in a wireless system are provided to enhance a performance by coupling a transmission power controlling method and an erasure-error correction method. If a channel environment is not good, transmission power is not allocated to prevent unnecessary transmission power consumption, and allowing each user to independently control transmission power and reduces multiple access interference. A channel state may be determined through a channel gain so that if a channel state is not good, a corresponding data symbol is regarded as an erasure symbol, and accordingly, a receiving end performs a demodulation by an erasure-error correction technique to restore data. Thus, a correction capability of a block code can be improved.
Claims30
A data transmission apparatus in a wireless system comprising:
- a Q-ary encoding unit to block-encode data to be transmitted;
- a modulating unit to receive each Q-ary symbol from the Q-ary encoding unit, the modulating unit to output modulated Q-ary symbols;
- and
- an amplifying unit to amplify each modulated data to a target power for a channel gain and output the amplified data.
A data transmitting method in a wireless system comprising:
- comparing detected channel gains with a reference value to classify a corresponding channel as one of a ‘GOOD’ state and a ‘BAD’ state;
- and
- controlling transmission power of the corresponding channel based on the classified state.
A data receiving apparatus in a wireless system comprising:
- a demodulating unit to demodulate a signal received by each sub-channel and output a Q-ary symbol;
- and
- a Q-ary decoding unit to perform a block decoding on a Q-ary symbol of each sub-channel output from the demodulating unit.
A data receiving method in a wireless system comprising:
- comparing channel gains of each sub-channel for transmission data with a reference value so as to classify the channels as one of ‘GOOD’ and ‘BAD’;
- storing data symbols according to the classification;
- and
- demodulating according to an erasure-error correction method so as to restore data.
A method of controlling transmission in a wireless system comprising:
- determining if a channel is in a ‘GOOD’ state or a ‘BAD’ state based on channel gains;
- and
- correcting for the ‘BAD’ state if the channel is determined to be in the ‘BAD’ state.
An apparatus for use in a wireless system comprising:
- a first device to send and receive wireless data;
- and
- a second device to determine if a channel is in a ‘GOOD’ state or a ‘BAD’ state based on channel gains and to correct for the ‘BAD’ state if the channel is determined to be in the ‘BAD’ state.
Dependencies are inferred from the claim text.