Combined space-time decoding
First Claim
1. A method for decoding space time coded (STC) signals comprising:
- a) receiving STC signals originating from a plurality of transmit antennas of a remote transmitter;
b) decoding the STC signals using a separate STC decoding technique to determine a plurality of initial solutions;
c) identifying a selected area about each of the initial solutions;
d) creating a decoding space corresponding to the selected areas; and
e) decoding the STC signals using a joint STC decoding technique to determine a final solution representing symbols transmitted from the plurality of transmit antennas.
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Abstract
The present invention relates to decoding space time coded (STC) signals transmitted from a number of transmit antennas. First, a separate detection technique is used to determine initial decoding solutions corresponding to the symbols transmitted from each of a number of transmit antennas at a given time. For each initial solution, a limited area about the initial solution is defined. Each of the limited areas will correspond to regions including constellation points proximate the initial solution. The initial solutions are used to define a limited, multi-dimensional space. Accordingly, the initial solutions are used to reduce the search complexity associated with joint decoding by defining a limited space about the initial solutions. Finally, a joint decoding technique is implemented within the limited space to find a final solution.
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Citations
38 Claims
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1. A method for decoding space time coded (STC) signals comprising:
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a) receiving STC signals originating from a plurality of transmit antennas of a remote transmitter;
b) decoding the STC signals using a separate STC decoding technique to determine a plurality of initial solutions;
c) identifying a selected area about each of the initial solutions;
d) creating a decoding space corresponding to the selected areas; and
e) decoding the STC signals using a joint STC decoding technique to determine a final solution representing symbols transmitted from the plurality of transmit antennas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for decoding space time coded (STC) signals comprising:
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a) receiving STC signals originating from a plurality of transmit antennas of a remote transmitter;
b) decoding the STC signals using a separate STC decoding technique to determine a plurality of initial solutions;
c) selecting a group of the initial solutions associated with a group of the transmit antennas;
d) removing initial solutions outside of the group from the initial solutions associated with the group to provide modified initial solutions for the group;
e) identifying a selected area about each of the modified initial solutions;
f) creating a decoding space corresponding to the selected areas; and
g) decoding the STC signals using a joint STC decoding technique to determine a final solution representing symbols transmitted from the transmit antennas associated with the group. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An apparatus for receiving space time coded (STC) signals comprising:
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a) receiver circuitry adapted to receive and demodulate modulated STC signals to provide STC signals;
b) an STC decoder adapted to;
i) receive the STC signals originating from a plurality of transmit antennas of a remote transmitter;
ii) decode the STC signals using a separate STC decoding technique to determine a plurality of initial solutions;
iii) identify a selected area about each of the initial solutions;
iv) create a decoding space corresponding to the selected areas; and
v) decode the STC signals using a joint STC decoding technique to determine a final solution representing symbols transmitted from the plurality of transmit antennas. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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29. An apparatus for receiving space time coded (STC) signals comprising:
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a) receiver circuitry adapted to received and demodulate modulated STC signals to provide STC signals;
b) an STC decoder adapted to;
i) receive the STC signals originating from a plurality of transmit antennas of a remote transmitter;
ii) decode the STC signals using a separate STC decoding technique to determine a plurality of initial solutions;
iii) select a group of the initial solutions associated with a group of the transmit antennas;
iv) remove initial solutions outside of the group from the initial solutions associated with the group to provide modified initial solutions for the group;
v) identify a selected area about each of the modified initial solutions;
vi) create a decoding space corresponding to the selected areas; and
vii) decode the STC signals using a joint STC decoding technique to determine a final solution representing symbols transmitted from the transmit antennas associated with the group. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification