Power and resource efficient uplink dmrs sequences for ifdma

A SC-OFDMA and sequence technology, applied in the field of wireless devices, can solve the problem of not carrying information

Active Publication Date: 2019-07-19
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides ways for mobile communication device users to receive signals from their base stations without being affected by interference caused when they are transmitting data over an unreliable medium like wired networks or satellite systems. This helps improve overall performance even with poor radio reception conditions.

Problems solved by technology

Technical Problem addressed in this patents relates to improving efficient use of space within mobile networks when utilizing different types of access techniques like Time Division Duplex Access (TDMA)-Multiple Carrier Interference Overall, these technical problem areas include optimization of scheduling assignments between various users and their corresponding transport resources based upon available resources allocated over specific times and frequencies.

Method used

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  • Power and resource efficient uplink dmrs sequences for ifdma
  • Power and resource efficient uplink dmrs sequences for ifdma
  • Power and resource efficient uplink dmrs sequences for ifdma

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 0A

[0344] Embodiment OA. A method of transmitting a reference signal at a reduced power level while maintaining the identifiability of the reference signal among other reference signals, the method comprising:

[0345] A sequence of QPSK symbols constituting quadrature phase shift keying;

[0346] wherein the sequence has a cubic metric smaller than a first predefined threshold;

[0347] and wherein the maximum cross-correlation between the sequence and a predetermined set of sequences is less than a second predefined threshold, wherein the predetermined set of sequences includes sequences transmittable by the wireless device; and

[0348] A sequence of QPSK symbols is transmitted.

Embodiment 1A

[0349] Embodiment 1A. A method of operating a wireless device 20, the method comprising using a reference signal sequence at a predetermined power level, wherein:

[0350] having identified a first set of signal sequences having at least one of a peak-to-average power ratio PAPR and a cubic metric CM below a corresponding threshold;

[0351] A second set of signal sequences has been identified as the first set or a subset of the first set, wherein optionally the second set has been determined by eliminating sequences of the first set of candidate signal sequences having the highest cross-correlation magnitude statistics identification, wherein optionally the elimination is iterative; and

[0352] A second set of signal sequences has been designated as reference signal sequences.

[0353] Embodiment 2A. The method of Embodiment 1A, wherein the values ​​of the first set of signal sequences and the second set of signal sequences are the same.

[0354] Embodiment 3A. The method ...

Embodiment 11A

[0362] Embodiment 11A. A method for multiplexing reference signals occupying different numbers of subcarriers, the method comprising:

[0363] determining a first reference signal sequence having a length L;

[0364] transmitting a subset of the first reference signal sequence on a first subset of the set of L subcarriers; and

[0365] A zero amplitude signal is transmitted on subcarriers that are not in the first subset of subcarriers.

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Abstract

A method of transmitting demodulation reference signals (DMRS) over one, three or five resource blocks (RBs) with Interleaved Frequency Division Multiple Access (IFDMA) from a wireless device to a wireless network node in a wireless network wherein Single Carrier Frequency Division Multiple Access (SC-OFDMA) is deployed in uplink, is provided. At least one of: a set of base sequences including thirty quadrature phase shifting keying, QPSK, sequences of length 6, 18 or 30 is determined, a demodulation reference signal sequence is derived from the determined set of base sequences, the demodulation reference signal sequence is multiplexed, and the multiplexed demodulation reference signal sequence is transmitted, by the wireless device, to the wireless network node.

Description

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Claims

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Application Information

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Owner TELEFON AB LM ERICSSON (PUBL)
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