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US 6,587,515 B1Granted
Differential transmitter diversity technique for wireless communications
OwnerHamid Jafarkhani, Vahid Tarokhinventors
Life of this patent
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Abstract
Input signals of each frame are encoded by mapping the signals onto a coordinate system dictated by the symbols of the previous frame, and symbols from a constellation are selected based on the results of such mapping. Received signals are detected by preprocessing the signals detected at each antenna with signals detected by the antenna at the immediately previous frame, and then applied to a maximum likelihood detector circuit, followed by an inverse mapping circuit.
Claims14
A method for encoding incoming signal stream comprising the steps of:
- receiving, at frame q, n×b bits from an incoming bit stream, where a frame has n time slots, b and n are preselected integers, and q is an integer index;
- mapping said n×b bits into n complex vectors Ai(Bq), i=1, 2, . . . , n, where Bq represents said n×b bits at frame q;
- computing n symbols for frame q from said n complex vectors and from n symbols computed for frame q−1.
An encoder comprising:
- a mapper responsive to applied bits for developing complex vectors,
- a processor for responsive to said complex vectors and to delayed transmitted symbols for developing a space-time set of symbols to be transmitted over at least two transmitting points, and
- a delay block responsive to said space-time set of symbols to be transmitted for developing said delayed transmitted symbols.
Dependencies are inferred from the claim text.