MIMO PGRC system and method

Abstract

A method of transmitting a wireless signal (FIGS. 3A-3C) is disclosed. A data stream is divided (306) into a first data stream and a second data stream. The first data stream is encoded (300) at a first data rate. The second data stream is encoded (320) at a second data rate different from the first data rate. A first part of the encoded first data stream is transmitted from a first transmit antenna (308). A second part of the encoded first data stream is transmitted from a second transmit antenna (312).

Description

CROSS-REFERENCES TO RELATED APPLICATIONS [0001] This application claims the benefit, under 35 U.S.C. §119(e)(1), of U.S. Provisional Application No. 60 / 678,471 (TI-60504PS), filed May 6, 2005, and incorporated herein by this reference.BACKGROUND OF THE INVENTION [0002] The present embodiments relate to wireless communications systems and, more particularly, to Multiple-input Multiple-output (MIMO) communication with Per Group Rate Control (PGRC). [0003] Wireless communications are prevalent in business, personal, and other applications, and as a result the technology for such communications continues to advance in various areas. One such advancement includes the use of spread spectrum communications, including that of code division multiple access (CDMA) which includes wideband code division multiple access (WCDMA) cellular communications. In CDMA communications, user equipment (UE) (e.g., a hand held cellular phone, personal digital assistant, or other) communicates with a base sta...

AI Technical Summary

Benefits of technology

[0013] In a second preferred embodiment, a wireless receiver receives a plurality of signals from a plurality of remote transmit antennas. The wireless receiver detects a first signal from a first group of the plurality of remote transmit antennas. Signals in the first group are encoded at a first code rate. The wireless receiver receives a second signal from a second group of the plurality of remote transmit antennas. Signals in the second group are encoded at a second code rate different from the first code rate. The wireless receiver produces a quality of signal indication for the first signal. In a preferred embodiment, receiver complexity is reduced by reporting a quality of signal for only the first group of remote transmit antennas.

Problems solved by technology

These interference signals degrade the intended data signal at the user equipment.

Thus, when the transmitted communication arrives at the receiver, it has been affected by the channel effect as well as interference signals.

Consequently, the originally-transmitted data is more difficult to decipher.

Communication system performance demands in user equipment, however, are often dictated by web access.

When there is a high correlation between the sub-streams, data may not be properly detected at the remote user equipment.

The improvement, however, significantly increases signal processing complexity.

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