Method and apparatus for providing transmit diversity with adaptive basis
AssigneeTexas Instruments Incorporated
InventorsYan Hui, Eko N. Onggosanusi, Gibong Jeong, Anand Ganesh Dabak
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Abstract
A method and apparatus are provided that uses the feedback information from an ARQ signal that is received to control the transmit diversity of a transmitter. The method provides for improved performance over some existing ARQ plus open loop transmit diversity schemes in terms of bit-error rate for a given Eb/No. Furthermore, the method does not require extra signaling used by closed loop TD schemes.
Claims14
A method for controlling transmit diversity in a first communication device operating in a system including the first communication device and a second communication device, the first and second communication devices both having stored a pre-determined basis set {wi}, the method comprising the steps of:
- (a) transmitting a packet from the first communication device to the second communication device by a transmit Diversity (TD) scheme using a first basis from {wi};
- (b) using the same basis as in step (a) for the next packet to be transmitted by the first communication device if the second communication device sends an acknowledgment (ACK) to the first communication device;
- and
- (c) using a different basis from {wi} by both the first and second communication devices if the second communication device sends an negative-acknowledgment (NACK) to the first communication device in response to step (a).
A communication device for communicating with a second communication device, the communication device comprising:
- a receiver for receiving an ARQ signal from the second communication device, and
- a transmit diversity controller having a transmit diversity configuration and in response to the ARQ signal determines if the transmit diversity configuration used to communicate with the second communication device needs to be adjusted.
Dependencies are inferred from the claim text.