Methods and apparatuses for advanced receiver design

Patent metadata

Field	Value
Publication number	US-2016353293-A1
Application number	US-201615169100-A
Country	US
Kind code	A1
Filing date	May 31, 2016
Priority date	May 29, 2015
Publication date	Dec 1, 2016
Grant date	—

Abstract

Disclosed are embodiments of apparatuses and methods of use thereof for frequency domain (FD) chip level (CL) equalizers used in wireless receivers. The FD-CL-EQ may further selectively apply a higher order matrix inverse or a lower order matrix inverse in the calculation of a channel estimate based on whether interference is present or not. Further disclosed are embodiments of methods and apparatuses for estimating pilot signal-to-interference ratio (SIR) in the wireless receivers. Further disclosed are methods and apparatuses for compensating for phase errors in received demodulated data symbols to improve performance of the wireless receivers.

First claim

What is claimed is:

1 . A wireless transmit receive unit (WTRU), the WTRU comprising a receiver capable of pilot signal-to-interference ratio (SIR) estimation,
the receiver including:
a demultiplexer configured to extract a real part of a demodulated pilot symbol, wherein the demodulated pilot symbol includes the real part and an imaginary part;
a delay unit configured to delay the demodulated pilot symbol;
a summing unit configured to subtract the delayed demodulated pilot symbol from the demodulated pilot symbol to generate a differential demodulated pilot symbol; and
a noise estimation unit configured to determine a pilot SIR estimate based on a ratio of a power associated with the real part of the demodulated pilot symbol to a power associated with the differential demodulated pilot symbol; and
a transmitter configured to transmit an indication of the pilot SIR estimate.

2 . The WTRU of claim 1 , wherein the WTRU is allocated resources based on the pilot SIR estimate.

3 . The WTRU of claim 1 , wherein a pilot signal power estimate is based on the power associated with the real part of the demodulated pilot symbol.

4 . The WTRU of claim 1 , wherein a pilot noise power estimate is based on the power associated with the differential demodulated pilot symbol.

5 . The WTRU of claim 1 , further comprising a first low-pass filter operably coupled to the demultiplexer, the first low-pass filter configured to filter the real part of the demodulated pilot symbol.

6 . The WTRU of claim 5 , further comprising a first power calculation unit operably coupled to the first low-pass filter, the first power calculation unit configured to calculate the power associated with the real part of the demodulated pilot symbol by calculating the power of the filtered real part of the demodulated pilot symbol.

7 . The WTRU of claim 6 , further comprising a second power calculation unit operably coupled to the summing unit, the second power calculation unit configured to calculate a power of the generated differential demodulated pilot symbol.

8 . The WTRU of claim 7 , further comprising a multiplier coupled to the second power calculation unit, the multiplier configured to output a value of half of the calculated power of the generated differential demodulated pilot symbol.

9 . The WTRU of claim 8 , further comprising a second filter operably coupled to the multiplier, the second filter configured to filter the value of half of the calculated power of the generated differential demodulated pilot symbol.

10 . The WTRU of claim 9 , wherein the power associated with the differential demodulated pilot symbol is the filtered value of half of the calculated power of the generated differential demodulated pilot symbol.

11 . A method for use by wireless transmit receive unit (WTRU), the method comprising:
receiving a demodulated pilot symbol; extracting a real part of the demodulated pilot symbol, wherein the demodulated pilot symbol includes the real part and an imaginary part; delaying the demodulated pilot symbol; subtracting the delayed demodulated pilot symbol from the demodulated pilot symbol to generate a differential demodulated pilot symbol; determining a pilot signal-to-interference ratio (SIR) estimate based on a ratio of a power associated with the real part of the demodulated pilot symbol to a power associated with the differential demodulated pilot symbol; and transmitting an indication of the pilot SIR estimate.

12 . The method of claim 11 , wherein the WTRU is allocated resources based on the pilot SIR estimate.

13 . The method of claim 11 , further comprising generating a pilot noise power estimate based on the power associated with the real part of the demodulated pilot symbol.

14 . The method of claim 11 , further comprising generating a pilot noise estimate based on the power associated with the differential demodulated pilot symbol.

15 . The method of claim 11 , further comprising low-pass filtering the real part of the demodulated pilot symbol.

16 . The method of claim 15 , further comprising calculating the power associated with the real part of the demodulated pilot symbol by calculating the power of the filtered real part of the demodulated pilot symbol.

17 . The method of claim 16 , further comprising calculating a power of the generated differential demodulated pilot symbol.

18 . The method of claim 17 , further comprising outputting a value of half of the calculated power of the generated differential demodulated pilot symbol.

19 . The method of claim 18 , further comprising filtering the value of half of the calculated power of the generated differential demodulated pilot symbol.

20 . The method of claim 19 , wherein the power associated with the differential demodulated pilot symbol is the filtered value of half of the calculated power of the generated differential demodulated pilot symbol.

Assignees

• Interdigital Tech Corp

Inventors

• Tsai Allan Y
• Lawton William E
• Iyer Lakshmi R
• Fazili Muhammad U
• Raghavan Manasa

Classifications

• H04L5/005

  of common pilots, i.e. pilots destined for multiple users or terminals · CPC title

• H04W24/02 Primary

  Arrangements for optimising operational condition · CPC title

• H04W72/0473

  the resource being transmission power · CPC title

• H04M2207/206

  composed of PSTN and wireless network · CPC title

• H04L43/028

  by filtering · CPC title