Stream transmission method and device
First Claim
Patent Images
1. A method of operating a transmitter, said method comprising:
- (1) being provided an average over at least one realization of a channel vector wherein elements of the channel vector are random variables;
(2) determining a mean square error for each stream weight of a plurality of stream weights based on the average over at least one realization of a channel vector;
(3) determining a first stream weight of the plurality of stream weights having the largest mean square error;
(4) increasing a power of the first stream weight;
(5) decreasing a power of each stream weight of the plurality of stream weights excluding the first stream weight; and
repeating steps (2) through (5) when all of the mean square errors of the plurality of stream weights are unequal.
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Abstract
A transmitter for implementing a stream transmission method is disclosed. Optionally, the transmitter first determines an equal weighting of a plurality of stream weights and transmits a plurality of transmission signals as a function of a plurality of data streams and the equal weighting of the plurality of stream weights. Thereafter, the transmitter reiterates as needed a determination of an unequal weighting of the plurality of stream weights and a transmission of the plurality of transmission signals as a function of the plurality of data streams and the unequal weighting of the plurality of stream weights.
54 Citations
17 Claims
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1. A method of operating a transmitter, said method comprising:
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(1) being provided an average over at least one realization of a channel vector wherein elements of the channel vector are random variables; (2) determining a mean square error for each stream weight of a plurality of stream weights based on the average over at least one realization of a channel vector; (3) determining a first stream weight of the plurality of stream weights having the largest mean square error; (4) increasing a power of the first stream weight; (5) decreasing a power of each stream weight of the plurality of stream weights excluding the first stream weight; and repeating steps (2) through (5) when all of the mean square errors of the plurality of stream weights are unequal. - View Dependent Claims (2)
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3. A method of operating a transmitter, said method comprising:
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(1) initializing a first stream weight; (2) establishing a resolution value, an initial value of the increment, and a statistical nature of the channel vector; (3) determining a weighting of a plurality of stream weights excluding the first stream weight; (4) determining a power variable; (5) increasing the first stream weight by a product of the power variable and an increment; (6) dividing the increment by a factor subsequent to increasing the first stream weight by a product of the power variable and the increment; (7) determining a weighting of a plurality of stream weights excluding the first stream weight; and repeating steps 4–
7 when the increment is greater than the resolution value.
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4. A transmitter, comprising:
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a module operable to determine a first unequal weighting of a plurality of stream weights; means for transmitting a plurality of transmission signals as a function of a plurality of data streams and the first unequal weighting of the plurality of streams weights; wherein, to determine the first unequal weighting of the plurality of stream weights, said module is further operable to; (1) determine a mean square error for each stream weight of a plurality of stream weights; (2) determine a first stream weight of the plurality of stream weights having the largest mean square error; (3) increase a power of the first stream weight; and (4) decrease a power of each stream weight of the plurality of stream weights excluding the first stream weight and repeat steps (1) through (4) when all of the mean square errors of the plurality of stream weights are unequal. - View Dependent Claims (5, 6, 7, 8, 9)
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10. A method of transmitting a plurality of data streams from a transmitter with multiple transmit antennas to a receiving unit, the method comprising the steps of:
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weighting data streams by unequal power weightings to create a plurality of weighted data streams, wherein the unequal power weightings for each data stream is based on a noise power and an average over at least one realization of a channel vector, wherein elements of the channel vector are random variables; and transmitting the plurality of weighted data streams to a receiving unit. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification