Method and system for space code transmit diversity of PUCCH

摘要

Aspects of the invention are directed to a transmit diversity method for use in a wireless terminal having a plurality of antennas and a wireless terminal configured to implement the method. The transmit diversity method includes using a different orthogonal sequence for each antenna, or group of antennas, for transmitting an uplink control channel from a wireless terminal to a base station. A first step of the method involves assigning at least one orthogonal sequence to one or more of the plurality of antennas, each of the plurality of antennas being assigned at least one orthogonal sequence. Once the orthogonal sequence is assigned, a further step involves scrambling a signal to be transmitted on the physical uplink control channel (PUCCH) using the at least one orthogonal sequence for each antenna thereby producing a scrambled PUCCH for transmission by each antenna. The scrambled PUCCH can then be transmitted on the plurality of antennas.

主权项

1. A method for use in a wireless terminal having a plurality of antennas comprising:
when the wireless terminal is not to implement a transmit diversity scheme based at least in part on at least one of mobility properties of the wireless terminal, location properties of the wireless terminal and statistical properties of a channel between the wireless terminal and a base station, each of the plurality of antennas being assigned a same orthogonal sequence; when the wireless terminal is to implement the transmit diversity scheme based at least in part on at least one of mobility properties of the wireless terminal, location properties of the wireless terminal and statistical properties of the channel between the wireless terminal and the base station, each antenna of the plurality of antennas being assigned a respective one of a plurality of different orthogonal sequences; scrambling a signal to be transmitted on a physical uplink control channel (PUCCH) based on the assignment, thereby producing a scrambled PUCCH for transmission by each antenna; transmitting the scrambled PUCCH on the plurality of antennas; and if each antenna of the plurality of antennas is assigned a respective one of the plurality of different orthogonal sequences, performing one of:
a) receiving a single orthogonal sequence index for one of the plurality of different orthogonal sequences to configure a first orthogonal sequence that the wireless terminal is to use; and
determining indices of the remaining plurality of different orthogonal sequences as a function of the single orthogonal sequence index, the plurality of different orthogonal sequences being assigned based on the single orthogonal sequence index and determined indices; andb) receiving an orthogonal sequence index for each orthogonal sequence that the wireless terminal is to use, the plurality of different orthogonal sequences being assigned based on the received orthogonal sequence indices.