Optimized high rate space-time codes for wireless communication
First Claim
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1. A method of generating space-time codes for a transmission system comprising the steps of:
- (i) selecting a set of initial coding parameters for the space-time code;
(ii) simulating a series of observations based on a model of known communication channel characteristics and decoding the simulated series of observations using a selected receiver structure so as to compute a performance metric for the coding parameters;
(iii) estimating a gradient for the performance metric as a function of the coding parameters;
(iv) updating the coding parameters for the space-time code using the estimated gradient;
(v) repeating steps (ii) through (iv) until an optimized set of coding parameters is obtained for the space-time code.
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Abstract
A space-time coding arrangement for wireless communications is disclosed where the codes are generated through stochastic approximation. The codes can be optimized over a wide range of performance metrics, receiver structures, and channel characteristics.
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Citations
28 Claims
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1. A method of generating space-time codes for a transmission system comprising the steps of:
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(i) selecting a set of initial coding parameters for the space-time code; (ii) simulating a series of observations based on a model of known communication channel characteristics and decoding the simulated series of observations using a selected receiver structure so as to compute a performance metric for the coding parameters; (iii) estimating a gradient for the performance metric as a function of the coding parameters; (iv) updating the coding parameters for the space-time code using the estimated gradient; (v) repeating steps (ii) through (iv) until an optimized set of coding parameters is obtained for the space-time code. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A transmitter comprising:
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a plurality of antennas; and an encoder responsive to incoming symbols and which delivers coded symbols to said antennas in a series of time intervals, the coded symbols arranged in accordance with a space-time code where the space-time code is generated by (i) selecting a set of initial coding parameters for the space-time code; (ii) simulating a series of observations based on a model of known communication channel characteristics and decoding the simulated series of observations using a selected receiver structure so as to compute a performance metric for the coding parameters; (iii) estimating a gradient for the performance metric as a function of the coding parameters; (iv) updating the coding parameters for the space-time code using the estimated gradient; (v) repeating steps (ii) through (iv) until an optimized set of coding parameters is obtained for the space-time code. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A receiver comprising:
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a plurality of antennas; and a decoder which receives incoming symbols from said antennas in a series of time intervals and which interprets the incoming symbols using a pre-specified detector structure and which delivers decoded symbols arranged in accordance with a space-time code where the space-time code is generated by (i) selecting a set of initial coding parameters for the space-time code; (ii) simulating a series of observations based on a model of known communication channel characteristics and decoding the simulated series of observations using the pre-specified detector structure so as to compute a performance metric for the coding parameters; (iii) estimating a gradient for the performance metric as a function of the coding parameters; (iv) updating the coding parameters for the space-time code using the estimated gradient; (v) repeating steps (ii) through (iv) until an optimized set of coding parameters is obtained for the space-time code. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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Specification