US 7,623,592 B2Granted

Reduced space time transmit diversity (STTD) interference transmission method

AssigneeFrance Telecom

InventorSylvie Mayrargue

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Abstract

Disclosed is a transmission method wherein n antennae emit each symbol with a spread spectrum code, where the codes are the same for n antennae at each transmission considered from k transmissions, k is an even number and the symbols are coded according to k successive codes corresponding to k transmissions. The k codes provide k/2 pairs of codes which verify, in each pair, the relationship in which a pair code is time-inverted and combined in relation to the other code of the pair, and is optionally multiplied by a module 1 complex constant.

Claims10

Dependent claims

A transmission method, comprising:

transmitting, from n antennas, symbols which are grouped into p-tuples, while simultaneously sending, for each p-tuple, k times n symbols, said n being greater than or equal to 2, the n symbols each comprising values from among said p-tuples which are in a modified order and are assigned weights chosen selectively from among −1, 0 and 1, and are selectively conjugated, so that k linear superpositions of n symbols are transmitted as a transmission matrix of dimensions k×p which is substantially orthogonal;
sending, from the n antennas, each symbol with a spread spectrum coding, the spread spectrum coding being the same on the n antennas at each transmission concerned among the k transmissions, the transmission being performed over a physical or contrived channel which constitutes substantially a sum of Diracs, so that each superposition of symbols is repeated a plurality of times on reception;
extracting each superposition of n symbols, said extraction being aided by a plurality of despreadings on each of said plural reception, and a plurality of extractions being aided by a plurality of despreadings for each of the k linear superpositions transmitted to obtain a plurality of estimations of k-tuples, each k-tuple forming a result of the k×p transmission matrix, an orthogonality of the k×p transmission matrix being utilized a plurality of times corresponding to each said plural k-tuple extractions aided by each of said plural despreadings to obtain a plurality of estimations of the p-tuples;
and
deducing a refined estimation of each symbol based on the plural estimations of the p-tuples;
wherein k is an even number;
and
wherein the symbols are coded according to k successive spread spectrum codes corresponding to the k transmissions, the k codes comprising k/2 pairs of spread spectrum codes which satisfy, in each pair, a relationship in which the spread spectrum code of the pair is time-inverted and conjugated with respect to the other spread spectrum code of the pair.

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Dependencies are inferred from the claim text.

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Abstract

A transmission method, comprising:

transmitting, from n antennas, symbols which are grouped into p-tuples, while simultaneously sending, for each p-tuple, k times n symbols, said n being greater than or equal to 2, the n symbols each comprising values from among said p-tuples which are in a modified order and are assigned weights chosen selectively from among −1, 0 and 1, and are selectively conjugated, so that k linear superpositions of n symbols are transmitted as a transmission matrix of dimensions k×p which is substantially orthogonal;
sending, from the n antennas, each symbol with a spread spectrum coding, the spread spectrum coding being the same on the n antennas at each transmission concerned among the k transmissions, the transmission being performed over a physical or contrived channel which constitutes substantially a sum of Diracs, so that each superposition of symbols is repeated a plurality of times on reception;
extracting each superposition of n symbols, said extraction being aided by a plurality of despreadings on each of said plural reception, and a plurality of extractions being aided by a plurality of despreadings for each of the k linear superpositions transmitted to obtain a plurality of estimations of k-tuples, each k-tuple forming a result of the k×p transmission matrix, an orthogonality of the k×p transmission matrix being utilized a plurality of times corresponding to each said plural k-tuple extractions aided by each of said plural despreadings to obtain a plurality of estimations of the p-tuples;
and
deducing a refined estimation of each symbol based on the plural estimations of the p-tuples;
wherein k is an even number;
and
wherein the symbols are coded according to k successive spread spectrum codes corresponding to the k transmissions, the k codes comprising k/2 pairs of spread spectrum codes which satisfy, in each pair, a relationship in which the spread spectrum code of the pair is time-inverted and conjugated with respect to the other spread spectrum code of the pair.

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