Method and apparatus for interference cancellation in wireless receivers

A multi-branch wireless receiver comprising:

• a first branch to receive a first received signal;
• a second branch to receive a second received signal;
• a sampling circuit comprising an offset circuit comprising a selector circuit that identifies an even time element of the clock signal as a first sample time and an odd time element of the clock signal as a second sample time, wherein the second sample time is offset from the first sample time by a predetermined time offset, wherein the predetermined time offset is Ts/m, where Ts33 represents a sampling period and m represents the number of branches in the multi-branch receiver, wherein the sampling circuit is configured to periodically sample the first and second received signals at the first and second sample times, respectively, to generate offset sample streams, and wherein the sampling circuit further comprises:
• a first sampler to periodically sample the first received signal at the first sample time to generate a first sample stream;
• and
• a second sampler to periodically sample the second received signal at the second sample time to generate a second sample stream offset from the first sample stream;
• and a combining circuit to combine the offset sample streams from the first and second branches to reduce multi-user interference in the received signals caused by sample time errors in the first and second branches.

A multi-branch wireless receiver comprising:

• an offset circuit to offset a first sample time and a second sample time by a predetermined time offset, wherein the offset circuit comprises a selector circuit that identifies an even element of a clock signal as the first sample time and an odd element of the clock signal as the second sample time offset form the first sample time;
• a first analog-to digital converter corresponding to a first branch of the multi-branch wireless receiver to periodically sample a first received signal at the first sample time to generate a first sample stream;
• and
• a second analog-to-digital converter corresponding to a second branch of the multi-branch wireless receiver to periodically sample a second received signal at the second sample time offset from the first sample time by the predetermined time offset to generate a second sample stream time offset from the first sample stream, wherein the predetermined time offset is Ts/m, where Ts represents a sampling period and m represents the number of branches in the multi-branch receiver;
• and
• a combining circuit to combine the offset sample streams from the first and second branches to reduce multi-user interference caused by sample time errors in the first and second branches.