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A communication signal receiver and associated method are disclosed. A plurality of communication signals are received at an atenna array and time multiplexed into a single multiplexed signal. Each of the communication signals comprises an unknown mixture of a plurality of source signals from a plur

A communication signal receiver and associated method are disclosed. A plurality of communication signals are received at an atenna array and time multiplexed into a single multiplexed signal. Each of the communication signals comprises an unknown mixture of a plurality of source signals from a plurality of communication signal sources. A signal separation network is configured to separate the K source signals from the multiplexed signal.

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What is claimed as the invention is: 1. A communication signal receiver comprising: an antenna array having a plurality of M antenna elements, each of the M antenna elements receiving a respective communication signal, and each communication signal comprising a mixture of K source signals from a pl

What is claimed as the invention is: 1. A communication signal receiver comprising: an antenna array having a plurality of M antenna elements, each of the M antenna elements receiving a respective communication signal, and each communication signal comprising a mixture of K source signals from a plurality of K communication signal sources; a multiplexer coupled to the antenna array for time multiplexing the M communication signals received by the M antenna elements into a single multiplexed signal; a frequency down converter for converting the multiplexed signal to a baseband frequency signal; an analog to digital converter configured to sample the baseband frequency signal to produce a digital multiplexed signal comprising a series of samples; an interpolator configured to interpolate consecutive samples in the digital multiplexed signal corresponding to each communication signal to generate respective interpolated digital signals, and a signal separation network configured to separate the K source signals from the interpolated digital signals; wherein the signal separation network comprises a blind signal separation unit. 2. The communication signal receiver according to claim 1, wherein the plurality of K source signals includes at least one desired signal. 3. The communication signal receiver according to claim 2, wherein the plurality of K source signals further includes at least one interference signal interfering with the at least one desired signal. 4. The communication signal receiver according to claim 1, implemented in a base station operating in a mobile communication system. 5. The communication signal receiver according to claim 1, implemented in a mobile communication device. 6. The communication signal receiver according to claim 5, wherein the mobile communication device is a cellular telephone. 7. A method for receiving communication signals, comprising the steps of: receiving a plurality of M communication signals, each communication signal comprising an unknown mixture of a plurality of K source signals; time multiplexing the plurality of M communication signals into a single multiplexed signal; and frequency converting the multiplexed signal to a baseband frequency signal; sampling the baseband frequency signal to produce a digital multiplexed signal comprising a series of samples; interpolating consecutive samples in the digital multiplexed signal corresponding to each of the M communication signals to generate respective interpolated digital signals, and separating each of the K source signals from the interpolated digital signals; wherein the step of separating the K source signals comprises the step of performing a blind signal separation operation on the interpolated digital signals. 8. The method according to claim 6, wherein the blind signal separation operation includes the step of demodulating the interpolated digital signals using predetermined communication channel frequencies. 9. The method according to claim 8, wherein the step of performing a blind signal separation operation comprises the steps of: determining a separation matrix B(n); and estimating the K source signals as {tilde over (ŝ)}(n) =B(n){tilde over ({circumflex over (r)}(n), where {tilde over (ŝ)}(n) is a K by 1 vector comprising estimates of the K source signals, and {tilde over ({circumflex over (r)}(n) is an M by 1 vector comprising the M interpolated digital signals. 10. The method according to claim 9, wherein the step of determining the separation matrix B(n) comprises the steps of: determining a whitening matrix Bw as description="In-line Formulae" end="lead"Bw (n+1)=F(n)Bw(n)-λ( n)F(n)[Bw(n){tilde over ({circumflex over (r)}(n){tilde over ({circumflex over (r)} (n)HBw(n)H-I]B w(n), wheredescription="In-line Formulae" end="tail" F(n) is a matrix dependent upon the predetermined communication channel frequencies, λ(n) is an adaptation rate parameter, I is an identity matrix, and H denotes the Hermitian transpose; determining a unitary matrix Br as description="In-line Formulae" end="lead"B r(n+1)=Br(n)-λ(n)└ υ({tilde over (ŝ)}(n)){tilde over (ŝ)} (n)H-{tilde over (ŝ)}(n)υ ({tilde over (ŝ)}(n))H┘B r(n), wheredescription="In-line Formulae" end="tail" υ({tilde over (ŝ)}(n)) is a skew-symmetric function; and determining the separation matrix B(n)=BrBw. 11. A wireless communication device comprising: a communication signal receiver; a communication signal transmitter; and an array of M antenna elements, each antenna element receiving a respective communication signal, each communication signal comprising an unknown mixture of a plurality of K source signals generated by a plurality of K signal sources, a frequency down converter for converting the multiplexed signal to a baseband frequency signal; an analog to digital converter configured to sample the baseband frequency signal to produce a digital multiplexed signal comprising a series of samples; and an interpolator configured to interpolate consecutive samples in the digital multiplexed signal corresponding to each communication signal to generate respective interpolated digital signals, wherein the receiver comprises: a multiplexer configured to time multiplex the plurality of received communication signals into a single multiplexed signal; and a blind signal separation unit configured to separate each of the K source signals from the multiplexed signal and the blind signal separation unit is coupled to receive the interpolated digital signals. 12. The wireless communication device according to claim 11, wherein the communication signal transmitter is switchably coupled to one of the M antenna elements to transmit communication signals via one of the antenna elements in the array. 13. The wireless communication device according to claim 11, wherein the blind signal separation unit comprises: a separation matrix identifier configured to determine a separation matrix B(n); and a demixer and fine demodulator configured to estimate the K source signals as {tilde over (ŝ)}(n)=B(n){tilde over ({circumflex over (r)}(n), where {tilde over (ŝ)}(n) is a K by 1 vector comprising estimates of the K source signals, and {tilde over ({circumflex over (r)}(n) is an M by 1 vector comprising the M interpolated digital signals. 14. The wireless communication device according to claim 13, wherein the separation matrix identifier is configured to: determine a whitening matrix Bw as description="In-line Formulae" end="lead"B w(n+1)=F(n)Bw(n)-λ (n)F(n)[Bw(n){tilde over ({circumflex over (r)}(n){tilde over ({circumflex over (r)} (n)HBw(n)H-I]B w(n), wheredescription="In-line Formulae" end="tail" F(n) is a matrix dependent upon predetermined communication channel frequencies, λ(n) is an adaptation rate parameter, I is an identity matrix, and H denotes the Hermitian transpose; determine a unitary matrix Br as description="In-line Formulae" end="lead"B r(n+1)=Br(n)-λ(n)└ υ({tilde over (ŝ)}(n)){tilde over (ŝ)} (n)υ({tilde over (ŝ)}(n))H ┘Br(n), wheredescription="In-line Formulae" end="tail" υ({tilde over (ŝ)}(n)) is a skew-symmetric function; and determine the separation matrix B(n)=BrBw. 15. The wireless communication device according to claim 14, wherein the blind signal separation unit comprises a digital signal processor (DSP). 16. The wireless communication device according to claim 11, wherein the wireless communication device is a base station in a mobile communication system. 17. The wireless communication device according to claim 11, wherein the wireless communication device is a two-way pager. 18. The wireless communication device according to claim 11, wherein the wireless communication device is a personal digital assistant (PDA). 19. A communication signal receiver comprising: an antenna array having a plurality of M antenna elements, each of the M antenna elements receiving a respective communication signal, and each communication signal comprising a mixture of K source signals from a plurality of K communication signal sources; a multiplexer coupled to the antenna array for time multiplexing the M communication signals received by the M antenna elements into a single multiplexed signal; and a frequency down converter for converting the multiplexed signal to a baseband frequency signal; an analog to digital converter configured to sample the baseband frequency signal to produce a digital multiplexed signal comprising a series of samples; a signal separation network configured to separate the K source signals from the multiplexed signal; wherein the signal separation network comprises a blind signal separation unit. 20. The communication signal receiver of claim 19 wherein consecutive samples in the digital multiplexed signal are interpolated corresponding to each of the M communication signals to generate respective interpolated digital signals. 21. The communication signal receiver according to claim 19, wherein the plurality of K source signals includes at least one desired signal. 22. The communication signal receiver according to claim 19, wherein the plurality of K source signals further includes at least one interference signal interfering with the at least one desired signal. 23. A method for receiving communication signals, comprising the steps of: receiving a plurality of M communication signals, each communication signal comprising an unknown mixture of a plurality of K source signals; time multiplexing the plurality of M communication signals into a single multiplexed signal; and frequency converting the multiplexed signal to a baseband frequency signal; sampling the baseband frequency signal to produce a digital multiplexed signal comprising a series of samples; interpolating consecutive samples in the digital multiplexed signal corresponding to each of the M communication signals to generate respective interpolated digital signals; and separating each of the K source signals from the interpolated digital signal. 24. The method of claim 23 wherein the step of separating the K source signals comprises the step of performing a blind signal separation operation on the interpolated digital signals. 25. The method according to claim 24, wherein the blind signal separation operation includes the step of demodulating the interpolated digital signals using predetermined communication channel frequencies. 26. The method according to claim 24, wherein the step of performing a blind signal separation operation comprises the steps of: determining a separation matrix B(n); and estimating the K source signals as {tilde over (ŝ)}(n) =B(n){tilde over ({circumflex over (r)}(n), where {tilde over (ŝ)}(n) is a K by 1 vector comprising estimates of the K source signals, and {tilde over ({circumflex over (r)}(n) is an M by 1 vector comprising the M interpolated digital signals. 27. The method according to claim 26, wherein the step of determining the separation matrix B(n) comprises the steps of: determining a whitening matrix Bw as description="In-line Formulae" end="lead"B w(n+1)=F(n)Bw(n)-λ (n)F(n)[Bw(n){tilde over ({circumflex over (r)}(n){tilde over ({circumflex over (r)} (n)HBw(n)H-I]B w(n), wheredescription="In-line Formulae" end="tail" F(n) is a matrix dependent upon the predetermined communication channel frequencies, λ(n) is an adaptation rate parameter, I is an identity matrix, and H denotes the Hermitian transpose; determining a unitary matrix Br as description="In-line Formulae" end="lead"B r(n+1)=Br(n)-λ(n)└ υ({tilde over (ŝ)}(n)){tilde over (ŝ)} (n)H-{tilde over (ŝ)}(n) υ ({tilde over (ŝ)}(n))H┘Br( n),wheredescription="In-line Formulae" end="tail" υ({tilde over (ŝ)}(n)) is a skew-symmetric function; and determining the separation matrix B(n)=BrBw. 28. A wireless communication device comprising: a communication signal receiver; a communication signal transmitter; and an array of M antenna elements, each antenna element receiving a respective communication signal, each communication signal comprising an unknown mixture of a plurality of K source signals generated by a plurality of K signal sources, a frequency down converter for converting the multiplexed signal to a baseband frequency signal; an analog to digital converter configured to sample the baseband frequency signal to produce a digital multiplexed signal comprising a series of samples; and wherein the receiver comprises: a multiplexer configured to time multiplex the plurality of received communication signals into a single multiplexed signal; and a blind signal separation unit configured to separate each of the K source signals from the multiplexed signal. 29. The wireless communications device of claim 28 further comprising: an interpolator configured to interpolate consecutive samples in the digital multiplexed signal corresponding to each communication signal to generate respective interpolated digital signals. 30. The wireless communications device of claim 29, wherein the blind signal separation unit is coupled to receive the interpolated digital signals. 31. The wireless communication device according to claim 28, wherein the communication signal transmitter is switchably coupled to one of the M antenna elements to transmit communication signals via one of the antenna elements in the array. 32. The wireless communication device according to claim 30, wherein the blind signal separation unit comprises: a separation matrix identifier configured to determine a separation matrix B(n); and a demixer and fine demodulator configured to estimate the K source signals as {tilde over (ŝ)}(n)=B(n){tilde over ({circumflex over (r)}(n), where {tilde over (ŝ)}(n) is a K by 1 vector comprising estimates of the K source signals, and {tilde over ({circumflex over (r)}(n) is an M by 1 vector comprising the M interpolated digital signals. 33. The wireless communication device according to claim 32, wherein the separation matrix identifier is configured to: determine a whitening matrix Bw as description="In-line Formulae" end="lead"B w(n+1)=F(n)Bw(n)-λ (n)F(n)[Bw(n){tilde over ({circumflex over (r)}(n){tilde over ({circumflex over (r)} (n)HBw(n)H-I]B w(n), wheredescription="In-line Formulae" end="tail" F(n) is a matrix dependent upon predetermined communication channel frequencies, λ(n) is an adaptation rate parameter, I is an identity matrix, and H denotes the Hermitian transpose; determine a unitary matrix Br as description="In-line Formulae" end="lead"B r(n+1)=Br(n)-λ(n)└ υ({tilde over (ŝ)}(n)){tilde over (ŝ)} (n)H-{tilde over (ŝ)}(n)υ ({tilde over (ŝ)}(n))H┘B r(n), wheredescription="In-line Formulae" end="tail" υ({tilde over (ŝ)}(n)) is a skew-symmetric function; and determine the separation matrix B(n)=BrBw. 34. The wireless communication device according to claim 33, wherein the blind signal separation unit comprises a digital signal processor (DSP). 35. The wireless communication device according to claim 28, wherein the wireless communication device is a base station in a mobile communication system. 36. The wireless communication device according to claim 28, wherein the wireless communication device is a two-way pager. 37. The wireless communication device according to claim 28, wherein the wireless communication device is a personal digital assistant (PDA).