Equal BER power control for uplink MC-CDMA with MMSE successive interference cancellation
First Claim
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1. A method for efficiently suppressing multiple access interference (MAI) in an uplink multi-carrier code-division multiple-access (MC-CDMA) system, comprising:
- integrating a nonlinear minimum mean-square error-successive interference cancellation (MMSE-SIC) receiver in said system with an equal bit-error rate (BER) power control (BER PC) to control transmit power of multiple users on the uplink,wherein, based on channel state information (CSI) obtained at the receiver, transmit power allocations of said multiple users are calculated by use of a successive algorithm that searches the transmit power of said multiple users under an equal BER criterion with a total transmit power constraint.
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Abstract
For a given decision order, MMSE successive interference cancellation (MMSE-SIC) can simultaneously maximize SIRs of all users. To further increase its efficiency, a power control (PC) algorithm, under equal BER criterion, is disclosed for uplink MC-CDMA. In frequency-selective Rayleigh fading channels, the MMSE-SIC integrated with the equal BER PC suppresses multiple access interference (MAI) effectively, resulting in a performance very close to the single user bound (SUB).
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13 Claims
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1. A method for efficiently suppressing multiple access interference (MAI) in an uplink multi-carrier code-division multiple-access (MC-CDMA) system, comprising:
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integrating a nonlinear minimum mean-square error-successive interference cancellation (MMSE-SIC) receiver in said system with an equal bit-error rate (BER) power control (BER PC) to control transmit power of multiple users on the uplink, wherein, based on channel state information (CSI) obtained at the receiver, transmit power allocations of said multiple users are calculated by use of a successive algorithm that searches the transmit power of said multiple users under an equal BER criterion with a total transmit power constraint. - View Dependent Claims (2, 3, 4)
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5. A method of suppressing multiple access interference (MAI) in an uplink multi-carrier code-division multiple-access (MC-CDMA) communication system, the method comprising:
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demodulating a received MC-CDMA signal using non-linear minimum mean-square error/successive interference cancellation reception (MMSE-SIC); and determining transmit power allocations for multiple uplink transmitters based on an equal bit-error rate (BER) power control scheme, wherein said equal BER power control scheme utilizes channel state information obtained from the received MC-CDMA signal, and wherein said determining comprises; using an iterative algorithm to search transmit powers of the multiple uplink transmitters according to an equal BER criterion with a total transmit power constraint. - View Dependent Claims (6, 7, 8)
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9. A receiver for a multi-carrier code-division multiple-access (MC-CDMA) signal, the receiver comprising:
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a non-linear minimum mean-square error/successive interference cancellation (MMSE-SIC) module to extract data from a received MC-CDMA signal; and an equal bit-error rate (BER) power control calculator to calculate transmit power allocations for multiple transmitters transmitting component signals of the received MC-CDMA signal, wherein the equal BER power control calculator is further to utilize channel state information obtained based on the received MC-CDMA signal, and wherein said equal BER power control calculator is to use an iterative algorithm to search transmit powers of the multiple transmitters according to an equal BER criterion with a total transmit power constraint. - View Dependent Claims (10, 11, 12, 13)
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Specification