Methods and apparatus for multi-carrier communication systems with adaptive transmission and feedback
AssigneeNeo Wireless LLC
InventorsXiaodong Li, Titus Lo, Kemin Li, Haiming Huang
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Abstract
An arrangement is disclosed where in a multi-carrier communication system, the modulation scheme, coding attributes, training pilots, and signal power may be adjusted to adapt to channel conditions in order to maximize the overall system capacity and spectral efficiency without wasting radio resources or compromising error probability performance, etc.
Claims30
A first device served by a second device using Orthogonal Frequency Division Multiplexing (OFDM) and utilizing OFDM symbols grouped in a time domain into time intervals, each time interval having a plurality of OFDM symbols, and subcarriers grouped in a frequency domain into blocks, each block having a plurality of consecutive subcarriers, the first device comprising:
- a transmitter;
- and
- a receiver, wherein:
- the receiver is configured to receive a control message on a forward link from the second device, and the control message includes a single value that indicates a modulation scheme of a plurality of modulation schemes and a pilot pattern of a plurality of pilot patterns to use in at least two blocks of the blocks of subcarriers over a time interval;
- and
- the transmitter is configured to transmit a reverse link signal over the at least two blocks of subcarriers over the plurality of OFDM symbols of the time interval, each block of the at least two blocks has the indicated modulation scheme and contains the indicated pilot pattern, and at least one of the plurality of OFDM symbols of the time interval includes data on some of the plurality of consecutive subcarriers and pilots on others of the plurality of consecutive subcarriers of each block of the at least two blocks.
A first device serving at least a second device and a third device using Orthogonal Frequency Division Multiplexing (OFDM) and utilizing OFDM symbols grouped in a time domain into time intervals, each time interval having a plurality of OFDM symbols, and subcarriers grouped in a frequency domain into blocks, each block having a plurality of consecutive subcarriers, the first device comprising:
- a transmitter;
- and
- a receiver, wherein:
- the transmitter is configured to transmit a control message on a forward link to the second device and to the third device, and the control message includes a single first value that indicates a first modulation scheme of a plurality of modulation schemes and a first pilot pattern of a plurality of pilot patterns for the second device to use in at least two blocks of the blocks of subcarriers over a time interval, and the control message includes a second single value that indicates a second modulation scheme of the plurality of modulation schemes and a second pilot pattern of the plurality of pilot patterns for the third device to use in two or more blocks of subcarriers over the time interval;
- and
- the receiver is further configured to:
- receive a first reverse link signal from the second device over the at least two blocks in over the plurality of OFDM symbols of the time interval, and each block of the at least two blocks has the indicated first modulation scheme and contains the indicated first pilot pattern;
- and
- receive a second reverse link signal from the third device over the two or more blocks over the plurality of OFDM symbols of the time interval, and each block of the two or more blocks has the indicated second modulation scheme and contains the indicated second pilot pattern;
- and
- at least one of the plurality of OFDM symbols of the time interval includes data on some of the plurality of consecutive subcarriers and pilots on others of the plurality of consecutive subcarriers of each block of the at least two blocks and each block of the two or more blocks.
Dependencies are inferred from the claim text.