Wireless communication system, receiving apparatus, modulating method for use therein, and program therefor
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Accused Products
Abstract
It is an object to provide a receiving apparatus which is capable of demodulating signals with a very simple arrangement. Receiving apparatus 1 has N reception antennas 11-1-11-N, and reception antennas 11-1-11-N receive signals. Channel coefficient estimator 12 estimates and outputs channel coefficients from the signals received by respective reception antennas 11-1-11-N. QR decomposer 13 is supplied with a channel matrix having the channel coefficients as its elements, performs QR decomposition on the channel matrix, and outputs a Q matrix and an R matrix. A QH processor 14 is supplied with the Q matrix and the received signals, multiplies the received signals by a complex conjugate transposed matrix of the Q matrix, and outputs converted signal z. A transmitted sequence estimator 15 is supplied with converted signal z and the R matrix and estimates transmitted sequences.
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Citations
129 Claims
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1. (canceled)
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2. (canceled)
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3. A wireless communication system for receiving and demodulating transmitted signals from a transmitting apparatus having M (M is an integer of 2 or greater) transmission antennas, with a receiving apparatus having N (N is an integer of 2 or greater), said receiving apparatus comprising:
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means for performing nulling representative of orthogonalization of the received signals, using a channel matrix having as elements channel coefficients between said reception antennas and said transmission antennas; and
means for outputting a likelihood for bits of said transmitted signals based on the nulled signals. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A wireless communication system for receiving and demodulating transmitted signals from a transmitting apparatus having M (M is an integer of 2 or greater) transmission antennas, with a receiving apparatus having N (N is an integer of 2 or greater), said receiving apparatus comprising:
means for using a Euclidean distance converted by performing a given processing operation on a squared Euclidean distance.
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41. A wireless communication system for receiving and demodulating transmitted signals from a transmitting apparatus having M (M is an integer of 2 or greater) transmission antennas, with a receiving apparatus having N (N is an integer of 2 or greater), said receiving apparatus comprising:
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an accumulator for accumulating a first squared Euclidean distance at a bit 0 and a second squared Euclidean distance at a bit 1, and outputting a provisional squared Euclidean distance based on the accumulated squared Euclidean distances; and
means for calculating a likelihood using said provisional squared Euclidean distance if either one of said first and second squared Euclidean distances is not output. - View Dependent Claims (42)
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43. A receiving apparatus having N (N is an integer of 2 or greater) reception antennas in a wireless communication system for receiving and demodulating transmitted signals from a transmitting apparatus having M (M is an integer of 2 or greater) transmission antennas, said receiving apparatus comprising:
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means for performing nulling representative of the received signals, using a channel matrix having as elements channel coefficients between said reception antennas and said transmission antennas; and
means for demodulating said transmitted signals based on the nulled signals. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81)
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44. A receiving apparatus having N (N is an integer of 2 or greater) reception antennas in a wireless communication system for receiving and demodulating transmitted signals from a transmitting apparatus having M (M is an integer of 2 or greater) transmission antennas, said receiving apparatus comprising:
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means for performing nulling representative of orthogonalization of the received signals, using a channel matrix having as elements channel coefficients between said reception antennas and said transmission antennas; and
means for calculating and outputting a likelihood for said transmitted signals based on the nulled signals.
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45. A receiving apparatus having N (N is an integer of 2 or greater) reception antennas in a wireless communication system for receiving and demodulating transmitted signals from a transmitting apparatus having M (M is an integer of 2 or greater) transmission antennas, said receiving apparatus comprising:
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means for performing nulling representative of orthogonalization of the received signals, using a channel matrix having as elements channel coefficients between said reception antennas and said transmission antennas; and
means for outputting a likelihood for bits of said transmitted signals based on the nulled signals.
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82. A receiving apparatus having N (N is an integer of 2 or greater) reception antennas in a wireless communication system for receiving and demodulating transmitted signals from a transmitting apparatus having M (M is an integer of 2 or greater) transmission antennas, said receiving apparatus comprising:
means for using a Euclidean distance converted by performing a given processing operation on a squared Euclidean distance.
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83. A receiving apparatus having N (N is an integer of 2 or greater) reception antennas in a wireless communication system for receiving and demodulating transmitted signals from a transmitting apparatus having M (M is an integer of 2 or greater) transmission antennas, said receiving apparatus comprising:
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an accumulator for accumulating a first squared Euclidean distance at a bit 0 and a second squared Euclidean distance at a bit 1, and outputting a provisional squared Euclidean distance based on the accumulated squared Euclidean distances; and
means for calculating a likelihood using said provisional squared Euclidean distance if either one of said first and second squared Euclidean distances is not output. - View Dependent Claims (84)
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85. A demodulating method of receiving and demodulating transmitted signals from a transmitting apparatus having M (M is an integer of 2 or greater) transmission antennas, in a receiving apparatus having N (N is an integer of 2 or greater) reception antennas, said demodulating method comprising the steps of:
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performing nulling representative of orthogonalization of the received signals, using a channel matrix having as elements channel coefficients between said reception antennas and said transmission antennas; and
demodulating said transmitted signals based on the nulled signals. - View Dependent Claims (88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123)
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86. A demodulating method of receiving and demodulating transmitted signals from a transmitting apparatus having M (M is an integer of 2 or greater) transmission antennas, in a receiving apparatus having N (N is an integer of 2 or greater) reception antennas, said demodulating method comprising the steps of:
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performing nulling representative of orthogonalization of the received signals, using a channel matrix having as elements channel coefficients between said reception antennas and said transmission antennas; and
calculating and outputting a likelihood for said transmitted signals based on the nulled signals.
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87. A demodulating method of receiving and demodulating transmitted signals from a transmitting apparatus having M (M is an integer of 2 or greater) transmission antennas, in a receiving apparatus having N (N is an integer of 2 or greater) reception antennas, said demodulating method comprising the steps of:
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performing nulling representative of orthogonalization of the received signals, using a channel matrix having as elements channel coefficients between said reception antennas and said transmission antennas; and
outputting a likelihood for bits of said transmitted signals based on the nulled signals.
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100. A demodulating method according to, wherein said transmitted sequence estimator comprises likelihood calculator groups in M stages (M is an integer of 2 or greater) and signal selector groups in the M stages.
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124. A demodulating method of receiving and demodulating transmitted signals from a transmitting apparatus having M (M is an integer of 2 or greater) transmission antennas, in a receiving apparatus having N (N is an integer of 2 or greater) reception antennas, said demodulating method comprising the step of:
using a Euclidean distance converted by performing a given processing operation on a squared Euclidean distance.
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125. A demodulating method of receiving and demodulating transmitted signals from a transmitting apparatus having M (M is an integer of 2 or greater) transmission antennas, in a receiving apparatus having N (N is an integer of 2 or greater) reception antennas, said demodulating method comprising the steps of:
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accumulating a first squared Euclidean distance at a bit 0 and a second squared Euclidean distance at a bit 1, and outputting a provisional squared Euclidean distance based on the accumulated squared Euclidean distances; and
calculating a likelihood using said provisional squared Euclidean distance if either one of said first and second squared Euclidean distances is not output. - View Dependent Claims (126)
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127. A program for a demodulating method of receiving and demodulating transmitted signals from a transmitting apparatus having M (M is an integer of 2 or greater) transmission antennas, in a receiving apparatus having N (N is an integer of 2 or greater) reception antennas, said program enabling a computer to perform:
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a process of performing nulling representative of orthogonalization of the received signals, using a channel matrix having as elements channel coefficients between said reception antennas and said transmission antennas; and
a process of demodulating said transmitted signals based on the nulled signals.
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128. A program for a demodulating method of receiving and demodulating transmitted signals from a transmitting apparatus having M (M is an integer of 2 or greater) transmission antennas, in a receiving apparatus having N (N is an integer of 2 or greater) reception antennas, said program enabling a computer to perform:
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a process of performing nulling representative of orthogonalization of the received signals, using a channel matrix having as elements channel coefficients between said reception antennas and said transmission antennas; and
a process of calculating and outputting a likelihood for said transmitted signals based on the nulled signals.
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129. A program for a demodulating method of receiving and demodulating transmitted signals from a transmitting apparatus having M (M is an integer of 2 or greater) transmission antennas, in a receiving apparatus having N (N is an integer of 2 or greater) reception antennas, said program enabling a computer to perform:
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a process of performing nulling representative of orthogonalization of the received signals, using a channel matrix having as elements channel coefficients between said reception antennas and said transmission antennas; and
a process of outputting a likelihood for bits of said transmitted signals based on the nulled signals.
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Specification