Power adjustment method and apparatus based on low delay power detection before DPD

Patent metadata

Field	Value
Publication number	US-9467954-B2
Application number	US-201314762968-A
Country	US
Kind code	B2
Filing date	Oct 14, 2013
Priority date	Jan 29, 2013
Publication date	Oct 11, 2016
Grant date	Oct 11, 2016

Abstract

Disclosed are a power adjustment method and an apparatus based on low delay power detection before digital pre-distortion. The method comprises the following steps: according to pre-configured system carrier information, obtaining effective carrier information containing an effective carrier channel corresponding to each effective carrier; performing sampling on carrier data of each effective carrier channel according to the obtained effective carrier information, and then calculating combination power Pa of effective carriers before digital up conversion or digital peak clipping cancellation according to the sampling; and using the combination power Pa of the effective carriers to perform power adjustment before digital pre-distortion. The present invention moves power calculation ahead of an up conversion module, fully utilizes inherent delay of digital up conversion and a peak clipping module to offset time required for the power calculation, and effectively reduces system delay.

First claim

The invention claimed is:

1. A method for power adjustment based on low-delay power detection before Digital Pre-Distortion (DPD), the method comprising steps of:
obtaining, by a power management computing device, effective carrier information including an effective carrier channel corresponding to an effective carrier based on preconfigured system carrier information, wherein the effective carrier is a carrier bearing information;
sampling, by the power management computing device, carrier data on an effective carrier channel based on the obtained effective carrier information;
determining, by the power management computing device, total power of effective carriers before Digital Up Conversion (DUC) or before digital Crest Factor Reduction (CFR) based on the sampled carrier data on the effective carrier channel; and
performing, by the power management computing device, power adjustment using the total power of the effective carriers prior to DPD by searching a power compensating search table for a compensating entry corresponding to the total power of the effective carriers and determining according to the compensating entry, an adjusted power value to be sent into a DPD module.

2. The method according to claim 1 , wherein the sampling the carrier data on the effective carrier channel comprises:
selecting, by the power management computing device, data sample points corresponding to a carrier data rate used; and
sampling, by the power management computing device, at the data sample points, carrier data before DUC on the effective carrier channel.

3. The method according to claim 2 , wherein the determining the total power of effective carriers before Digital Up Conversion (DUC) or before digital Crest Factor Reduction (CFR) comprises:
calculating, by the power management computing device, using power of sampled carrier data at the data sample points on the effective carrier channel, an average carrier power of the effective carrier channel; and
obtaining, by the power management computing device, the total power of the effective carriers by summing average carrier power over the effective carrier channels.

4. The method according to claim 2 , wherein the determining the total power of effective carriers before Digital Up Conversion (DUC) or before digital Crest Factor Reduction (CFR) comprises:
obtaining, by the power management computing device, the total power of the effective carriers at a data sample point by summing power of carrier data sampled at the data sample point over the effective carrier channels; and
obtaining, by the power management computing device, the total power of the effective carriers by averaging the total power of the effective carriers at the data sample points.

5. The method according to claim 1 , wherein the sampling the carrier data on the effective carrier channel comprises:
selecting, by the power management computing device, data sample points according to a carrier data rate and a DUC interpolation multiple; and
sampling, by the power management computing device, at the data sample points, carrier data after DUC on the effective carrier channel.

6. The method according to claim 5 , wherein the determining the total power of effective carriers before Digital Up Conversion (DUC) or before digital Crest Factor Reduction (CFR) comprises:
calculating, by the power management computing device, average carrier power of the effective carrier channel using power of sampled carrier data at the data sample points on an effective carrier channel; and
obtaining, by the power management computing device, the total power of the effective carriers by summing average carrier power over the effective carrier channels.

7. The method according to claim 5 , wherein the determining the total power of effective carriers before Digital Up Conversion (DUC) or before digital Crest Factor Reduction (CFR) comprises:
obtaining, by the power management computing device, the total power of the effective carriers at a data sample point by summing power of carrier data sampled at the data sample point over the effective carrier channels; and
obtaining, by the power management computing device, the total power of the effective carriers by averaging the total power of the effective carriers at the data sample points.

8. The method according to claim 1 , wherein the adjusted power value equals to a product of the total power of the effective carriers and the compensating entry.

9. A power management computing device comprising a processor and a memory coupled to the processor which is configured to be capable of executing programmed instructions comprising and stored in the memory to:
obtain effective carrier information including an input data channel corresponding to an effective carrier based on preconfigured system carrier information, wherein the effective carrier is a carrier bearing information;
sample carrier data on an effective carrier channel based on the obtained effective carrier information;
determine total power of effective carriers before Digital Up Conversion (DUC) or before digital Crest Factor Reduction (CFR) elimination based on the sampled carrier data on the effective carrier channel; and
perform power adjustment using the total power of the effective carriers prior to DPD by searching a power compensating search table for a compensating entry corresponding to the total power of the effective carriers and determining, according to the compensating entry, an adjusted power value.

10. The device according to claim 9 , wherein the sampling the carrier data on the effective carrier channel comprises:
selecting data sample points corresponding to a carrier data rate used, and sampling, at the data sample points, carrier data before DUC on the effective carrier channel; and
determining the total power of the effective carriers before DUC or before Digital CFR based on the sampled carrier data on the effective carrier channels.

11. The device according to claim 9 , wherein the sampling the carrier data on the effective carrier channel comprises:
selecting data sample points according to a carrier data rate and a DUC interpolation multiple, and sampling, at the data sample points, carrier data after DUC on the effective carrier channel; and
determining, according to the sampled carrier data on the effective carrier channels, the total power of the effective carriers before DUC or before Digital CFR.

Assignees

• Zte Corp

Inventors

• Cao Zhen
• Qiu Hao
• Chen Wei
• Xiao Cong
• Yuan Xuelong

Classifications

• H04L27/367

  using predistortion · CPC title

• H04W52/52 Primary

  using AGC [Automatic Gain Control] circuits or amplifiers · CPC title

• H04B17/364

  Delay profiles · CPC title

• H03F3/24

  of transmitter output stages · CPC title

• H03F3/195

  in integrated circuits · CPC title