Non-zero complex weighted space-time code for multiple antenna transmission
AssigneeNokia Corporation
InventorsKiran Kuchi, Ari Hottinen, Olav Tirkkonen
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Abstract
The present invention presents a method and apparatus for phase hopping and space-time coding signals for transmission on multiple antennas. The method and apparatus provides expansion of a N×N′ space time block code to a M×M′ space time block code, where M>N, by using phase hopping on the symbols within the N×N′ space time block code to allow transmission of the space time block code on a number of diversity antennas greater than N′. A result of M antenna diversity may be achieved for M transmit antennas.
Claims22
A method for transmitting a signal from a plurality of antennas, said method comprising the steps of:
- receiving a symbol stream at a transmitter;
- performing a transform on said input symbol stream to generate a transform result, said transform result comprising an NXN′ orthogonal space-time block code, and generating N first signals;
- non-zero complex weighting, over time, at least one of the N first signals of said transform result to generate at least one second signal, each of said at least one second signals being phase shifted relative to the one of the N first signals from which it was generated, the N first signals and the at least one second signal together forming M signals, wherein M is greater than N;
- and,
- transmitting, substantially simultaneously, each of said N first signals of said transform result on one of a first at least one antenna and, each of said at least one second signals on one of a second at least one antenna, thereby to transmit the symbol stream upon M transmit diversity paths.
An apparatus for transmitting a signal, said apparatus comprising:
- an input symbol stream;
- a processor for performing a transform on said input symbol stream to generate a transform result, said transform result comprising an N×N′ orthogonal space-time block code, and generating N first signals;
- at least one weighter for, non-zero complex weighting, over time, at least one of the N first signals of said transform result to generate at least one second signal, each of said at least one second weighted signals phase shifted relative to the one of the N′ first signals from which it was generated, the N first signals and the at least one second signal together forming M signals, wherein M is greater than N;
- and,
- a transmitter for transmitting, substantially simultaneously, each of said N first signals of said transform result on one of a first at least one antenna, and each of said at least one second signal on one of a second at least one antenna, thereby to transmit the symbol stream upon M transmit diversity paths.
Dependencies are inferred from the claim text.