Apparatus, and associated method, for forming a signal for communication upon a fading channel
AssigneeNokia Corporation
InventorDumitru Mihai Ionescu
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Abstract
A modulator, and an associated method, are described for use by a sending station, operable in a communication system, to communicate data to a receiving station upon a communication channel susceptible to fading. The modulator includes a mapper for mapping modulator output symbols to a set of antennas. The modulator ensures that an Orthogonality Condition is satisfied to impart maximum transmission diversity upon the data sent over the fading communication channel.
Claims20
In a radio communication system having a sending station and a receiving station connected by way of a communication channel susceptible to fading, the sending station for sending data upon the communication channel to the receiving station, an improvement of a modulator for the sending station, said modulator comprising:
- a mapper coupled to receive a group of encoder output symbols, the encoder output symbols encoded representations of the data to be communicated upon the communication channel, said mapper for mapping the group of encoder output symbols to at least a first sequence of modulator output symbols, the at least first sequence formed of at least one symbol, and the at least first sequence forming a codeword, such that a Hermitian of a difference matrix formed between an arbitrary pair of codewords multiplied by the difference matrix forms a diagonal product matrix having a diagonal with all diagonal elements of the diagonal equal to each other.
In a method for communicating data in a communication system between a sending station and a receiving station connected by way of a communication channel susceptible to fading, an improvement of a method for modulating a group of encoder output symbols, the group of encoder output symbols encoded representations of the data to be communicated upon the communication channel, said method comprising:
- mapping the group of encoder output symbols to at least a first sequence of modulator output symbols, the at least first sequence of the modulator output symbols formed of at least one symbol and the at least first sequence forming a codeword such that a Hermitian of a difference matrix formed between an arbitrary number of codewords multiplied by the difference matrix forms a diagonal product matrix having a diagonal with all diagonal elements of the diagonal equal to each other.
Apparatus for a sending station operable in a communication system to communicate data to a receiving station on a channel susceptible to fading, said apparatus comprising:
- an encoder coupled to receive digital representations of the data, said encoder for forming encoder output symbols, the encoder output symbols encoded representations of the data;
- and
- a mapper coupled to receive the group of encoder output symbols, said mapper for mapping the group of encoder output symbols to at least a first sequence of modulator output symbols, the at least first sequence formed of at least one symbol, and the at least first sequence forming a codeword, such that a Hermitian of a difference matrix formed between an arbitrary pair of codewords multiplied by the difference matrix forms a diagonal product matrix having a diagonal with all diagonal elements of the diagonal equal to each other.
Dependencies are inferred from the claim text.