Method for adaptive quadrature amplitude modulation signal constellation remapping for data packet retransmissions

A technology of quadrature amplitude modulation and data modulation, applied in digital transmission system, modulated carrier system, transmission modification based on link quality, etc., can solve problems such as inability to use QAM signal bit separation

Inactive Publication Date: 2009-04-08
INTERDIGITAL TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Symbol-level remapping techniques in the prior art cannot take adva...

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  • Method for adaptive quadrature amplitude modulation signal constellation remapping for data packet retransmissions
  • Method for adaptive quadrature amplitude modulation signal constellation remapping for data packet retransmissions
  • Method for adaptive quadrature amplitude modulation signal constellation remapping for data packet retransmissions

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Embodiment

[0067] CLAIMS 1. A method for adaptively remapping data packet retransmissions in a wireless communication system comprising a receiver, the method comprising: receiving a current channel coding for a current data packet transmission.

[0068] 2. The method according to embodiment 1, further comprising: determining whether the channel coding rate is higher than a predetermined channel coding threshold.

[0069] 3. The method as in any one of embodiments 1-2, further comprising: selecting a signal constellation for data modulation based on whether the channel coding rate is higher than a predetermined threshold.

[0070] 4. The method according to any one of embodiments 1-3, further comprising: selecting a part of the selected constellation remapping table according to the modulation type of the current data packet transmission.

[0071] 5. The method according to any one of embodiments 1 to 4, further comprising: selecting a signal constellation according to an identification ...

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Abstract

The present invention relates to a simplified QAM signal constellation symbol-wise remapping scheme for data packet retransmissions to improve performance at a high coding rate. The simplified QAM signal constellation symbol-wise remapping scheme takes advantage of the separate I and Q labeling bits in a QAM signal to reduce the complexity of a receiving node. The present invention also relates to a method for adaptive switching between bit-wise and symbol-wise constellation remapping for data packet transmissions according to channel coding rate to achieve optimum performance across the range of channel coding rates.

Description

technical field [0001] The present invention relates to digital data modulation in wireless communication systems. More particularly, the present invention relates to a method for implementing adaptive quadrature amplitude modulation (QAM) signal constellation remapping during data packet retransmission. Background technique [0002] In digital data transmission, it is commonly practiced to indicate successful receipt of a data packet by transmitting an acknowledgment (ACK) signal from the receiver to the transmitter. If the transmitter does not receive an ACK within a specified period or receives a negative acknowledgment (NACK) signal, the data packet will be retransmitted. [0003] Retransmitting data packets may provide an opportunity to improve retransmission efficiency by using signal diversity. For example, data packets can be retransmitted on different frequencies to achieve frequency diversity, or data packets can also be retransmitted on different antennas to ach...

Claims

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Application Information

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IPC IPC(8): H04L1/18H04L1/00H04L27/34H04L27/36
CPCH04L27/366H04L1/1812H04L1/0015H04L27/34H04L1/1893H04L1/18H04L27/36H04L1/00
Inventor Y·李
Owner INTERDIGITAL TECH CORP
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