Signal separation for a CDMA communications device and associated methods
First Claim
1. A code division multiple access (CDMA) communications device comprising:
- an antenna array comprising N antenna elements for receiving at least M different summations from a mixture of source signals provided by M signal sources, the at least M different summations defining the mixture of source signals, where N<
M;
a receiver assembly connected to said antenna array for receiving the at least M different summations, said receiver assembly comprisinga first signal path comprising aa signal separation processor for forming a mixing matrix comprising up to the at least M different summations of the M source signals, the mixing matrix having a rank equal to at least N, said signal separation processor for separating at least one source signal from the mixing matrix, anda selector for determining if the at least one separated source signal is an interferer source signal,a second signal path parallel to the first signal path for receiving the at least M different summations, the second signal path comprising a delay for delaying the at least M different summations corresponding to a delay introduced in the first signal path;
a summer connected to the first and second signal paths for respectively receiving from the first signal path at least one separated source signal if the separated source signal is an interferer source signal, and from the second signal path the at least M different summations after being delayed, said summer for removing the at least one interferer source signal if present from the at least M different summations after being delayed; and
a rake receiver coupled to said summer for receiving the at least M different summations without the at least one interferer source signal.
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Abstract
A method for operating a CDMA communications device includes receiving at an antenna array M different summations from a mixture of source signals provided by M signal sources, and providing the M different summations to a receiver assembly. The receiver assembly includes a first signal path and a second signal path parallel to the first signal path. In the first signal path, a mixing matrix including the M different summations of the M source signals is formed, and at least one source signal is separated from the mixing matrix. A determination is made if the separated source signal is an interferer source signal. In the second signal path, the M different summations are delayed corresponding to a delay introduced in the first signal path. The first signal path provides to a summer the separated source signal if the separated source signal is an interferer source signal, and the second signal path provides to the summer the M different summations after being delayed. The summer removes the interferer source signal if present from the M different summations after being delayed.
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Citations
28 Claims
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1. A code division multiple access (CDMA) communications device comprising:
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an antenna array comprising N antenna elements for receiving at least M different summations from a mixture of source signals provided by M signal sources, the at least M different summations defining the mixture of source signals, where N<
M;a receiver assembly connected to said antenna array for receiving the at least M different summations, said receiver assembly comprising a first signal path comprising a a signal separation processor for forming a mixing matrix comprising up to the at least M different summations of the M source signals, the mixing matrix having a rank equal to at least N, said signal separation processor for separating at least one source signal from the mixing matrix, and a selector for determining if the at least one separated source signal is an interferer source signal, a second signal path parallel to the first signal path for receiving the at least M different summations, the second signal path comprising a delay for delaying the at least M different summations corresponding to a delay introduced in the first signal path; a summer connected to the first and second signal paths for respectively receiving from the first signal path at least one separated source signal if the separated source signal is an interferer source signal, and from the second signal path the at least M different summations after being delayed, said summer for removing the at least one interferer source signal if present from the at least M different summations after being delayed; and a rake receiver coupled to said summer for receiving the at least M different summations without the at least one interferer source signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for operating a code division multiple access (CDMA) communications device comprising an antenna array comprising N antenna elements, and a receiver assembly connected thereto, the method comprising:
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receiving at the antenna array at least M different summations from a mixture of source signals provided by M signal sources, the at least M different summations defining the mixture of source signals, where N<
M;providing the at least M different summations to the receiver assembly, the receiver assembly comprising a first signal path and a second signal path parallel to the first signal path, and performing the following within the first and second signal paths in the first signal path, forming a mixing matrix comprising up to the at least M different summations of the M source signals, the mixing matrix having a rank equal to at least N, separating at least one source signal from the mixing matrix, and determining if the at least one separated source signal is an interferer source signal, and in the second signal path, delaying the at least M different summations corresponding to a delay introduced in the first signal path; providing to a summer from the first signal path the at least one separated source signal if the separated source signal is an interferer source signal, and from the second signal path the at least M different summations after being delayed, the summer for removing the at least one interferer source signal if present from the at least M different summations after being delayed; and providing the at least M different summations without the at least one interferer source signal to a rake receiver. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification