Incremental redundancy transmission in a mimo communication system

Abstract

For an incremental redundancy (IR) transmission in a MIMO system, a transmitter processes (e.g., encodes, partitions, interleaves, and modulates) a data packet based on a selected rate to obtain multiple data symbol blocks. The transmitter transmits one data symbol block at a time until a receiver correctly recovers the data packet or all blocks are transmitted. Whenever a data symbol block is received from the transmitter, the receiver detects a received symbol block to obtain a detected symbol block, processes (e.g., demodulates, deinterleaves, re-assembles, and decodes) all detected symbol blocks obtained for the data packet, and provides a decoded packet. If the decoded packet is in error, then the receiver repeats the processing when another data symbol block is received for the data packet. The receiver may also perform iterative detection and decoding on the received symbol blocks for the data packet multiple times to obtain the decoded packet.

Description

[0001] Claim priority under 35 U.S.C § 119 [0002] This application claims priority to U.S. Provisional Patent Application No. 60 / 501,777, filed September 9, 2003, and U.S. Provisional Patent Application No. 60 / 531,391, filed December 19, 2003, both of which are incorporated by reference in their entirety method incorporated here. field of invention [0003] The present invention relates generally to communications, and more particularly to techniques for transmitting data in multiple-input multiple-output (MIMO) communication systems. technical background [0004] A MIMO system employs multiple (N T ) transmit antenna and multiple (N R ) receiving antenna for data communication, so it is expressed as (N T , N R )system. can put by N T transmit antennas and N R A MIMO channel formed by receiving antennas is decomposed into N S spatial channels, where N S ≤min{N T , N R}. If the N created by multiple transmit and receive antennas S If three spatial channels are ...

AI Technical Summary

Problems solved by technology

If the selected rate for a data packet is too conservative (e.g. because the actual SNR is much better than the SNR estimate), then sending that data packet consumes too many system resources and thus the channel capacity is underutilized

Conversely, if the selected rate of the data packet is too aggressive, the receiver may decode the packet incorrectly, thus consuming system resources to retransmit the data packet

Rate selection for MIMO systems is very challenging because: (1) channel estimation of MIMO channels is relatively complex; (2) time-varying and independent characteristics of multiple spatial channels of MIMO channels

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