초록 ▼

Orthogonal transmit diversity is implemented by employing a data splitter (803) to subdivide channel information (801) into at least a first portion of bits (802) and a second portion of bits (804). Each portion is spread with its own Walsh code for eventual transmission to a mobile station via a pr

Orthogonal transmit diversity is implemented by employing a data splitter (803) to subdivide channel information (801) into at least a first portion of bits (802) and a second portion of bits (804). Each portion is spread with its own Walsh code for eventual transmission to a mobile station via a predetermined carrier frequency. When the number of bits in the first and second portion (802, 804) are small, separate Walsh codes are used to maintain orthogonality. When the number of bits in the first and second portion (802, 804) are relatively large, a time-division multiplex transmission is used to maintain orthogonality. A controller (809) controls the subdivision of the channel information and also an interleaver (308) to further enhance the effects of the diversity transmission. Control information related to the subdivision is transmitted to the mobile station so the channel information can be accurately reconstructed prior to decoding.

대표청구항 ▼

[ What we claim is:] [1.] A base-station in a communication system comprising:an interleaver outputting data that is to be transmitted to a single mobile station;a first spreader having a first portion of the data as an input and outputting the first portion spread with a first spreading code;a seco

[ What we claim is:] [1.] A base-station in a communication system comprising:an interleaver outputting data that is to be transmitted to a single mobile station;a first spreader having a first portion of the data as an input and outputting the first portion spread with a first spreading code;a second spreader having a second portion of the data as an input and outputting the second portion spread with a second spreading code, wherein the first portion bypasses the second spreader and the second portion bypasses the first spreader;a third spreader having a pilot code as an input and outputting the pilot code spread with a third spreading code to produce a first pilot channel;a fourth spreader having the pilot code as an input and outputting the pilot code spread with a fourth spreading code to produce a second pilot channel;a first antenna having the first spread portion and the first pilot channel as an input; anda second antenna having the second spread portion and the second pilot channel as an input,wherein the first, second, third, and fourth spreading codes are orthogonal to one another.