Partial decorrelation for a coherent multicode code division multiple access receiver
AssigneeLucent Technologies Inc.
InventorsHoward C. Huang, Chih-Lin I
Life of this patent
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Abstract
A Multicode (MC) Code Division Multiple Access (CDMA) receiver receives J encoded multicode channels (where J>1) over L multiple air signal paths (where L>1) and forms a decorrelator output vector in which for each of the J multicode channels, the interference caused by the other J−1 multicode channels has been cancelled. When the MC CDMA receiver is a coherent receiver, a pilot interference canceller cancels a received pilot signal from the J channel code of each of the received J multicode channels prior to forming the decorrelator output vector.
Claims15
A multiple-code (MC) code division multiple access (CDMA) receiver for simultaneously receiving and demodulating J data signals within a CDMA signal, where J is an integer, J>1, and where the jth data signal, j=1 . . . J, is received over a plurality of Lj paths where Lj is an integer, Lj≧1, the MC-CDMA receiver comprising
- means for receiving the J data signals, and forming therefrom Lj multipath delay estimates and Lj channel estimates for the jth data signal,
- means for demodulating Lj multipath components of the jth data signal and combining the results to form J decision statistics for the J data signals,
- a decorrelator, responsive to the L, L=L1+L2+ . . . +LJ, channel estimates, the L multipath delays and the J data-signal codes, for suppressing, for a desired received data signal, interference caused by the other J−1 data signals;
- and
- a processor for producing therefrom the desired demodulated data signal.
A method of operating a multiple-code (MC) code division multiple access (CDMA) receiver for simultaneously receiving and demodulating J data signals within a CDMA signal, where J is an integer, J>1, and where the jth data signal, j=1 . . . J, is received over a plurality of Lj paths where Lj is an integer, Lj≧1, the method comprising steps of
- receiving the J data signals, and forming therefrom Lj multipath delay estimates and Lj channel estimates for the jth, j=1 to J, data signal,
- demodulating Lj multipath components of the jth data signal and combining the results to form J decision statistics for the J data signals,
- at a decorrelator, responsive to the L, L=L1+L2+ . . . +LJ, channel estimates, the L multipath delays and the J data-signal codes, suppressing, for a desired received data signal, interference caused by the other J−1 data signals;
- and
- at a processor, producing therefrom the desired demodulated data signal.
- 14.The method of claim 13 further including the step of:
- forming a J-by-J inverse correlation matrix M−1 from the J decision statistics.
Dependencies are inferred from the claim text.