Generating a composite signal with code division multiplexing (CDM) and time division multiplexing (TDM) pilots

Patent metadata

Field	Value
Publication number	US-12574068-B2
Application number	US-202519252579-A
Country	US
Kind code	B2
Filing date	Jun 27, 2025
Priority date	Nov 27, 2008
Publication date	Mar 10, 2026
Grant date	Mar 10, 2026

Abstract

A wireless device is configured to produce a signal in a time slot of a frame, wherein the time slots have variable lengths. The signal having a first portion and a second portion, wherein the first portion and the second portion are located in defined time regions in the slot. Further, the first portion having data and a multiplexed first pilot, wherein the multiplexed first pilot is derived from a pseudo random sequence, the second portion having a pilot sequence and a cyclic prefix. The wireless device transmits the produced signal in the time slot.

First claim

What is claimed is:

1 . A wireless device comprising:
a transceiver; and a processor, wherein: the processor is configured to produce a signal in a time slot of a frame, wherein the time slots have variable lengths, the signal having a first portion and a second portion, the first portion and the second portion are located in defined time regions in the slot, the first portion having data and a multiplexed first pilot, wherein the multiplexed first pilot is derived from a pseudo random sequence, the second portion having a pilot sequence and a cyclic prefix, and the transceiver is configured to transmit the produced signal in the time slot.

2 . The wireless device of claim 1 wherein the pilot sequence of the second portion has a constant amplitude.

3 . The wireless device of claim 1 wherein the cyclic prefix includes a replicated portion of the pilot sequence.

4 . The wireless device of claim 1 wherein the second portion is configured to be processed using a Fast Fourier Transform (FFT)-based channel estimation algorithm.

5 . The wireless device of claim 1 wherein the multiplexed first pilot is multiplexed using Frequency Division Multiplexing (FDM).

6 . The wireless device of claim 1 wherein the wireless device is a user equipment.

7 . A method comprising:
producing, by a wireless device, a signal in a time slot of a frame, wherein the time slots have variable lengths, the signal having a first portion and a second portion, the first portion and the second portion are located in defined time regions in the slot, the first portion having data and a multiplexed first pilot, wherein the multiplexed first pilot is derived from a pseudo random sequence, the second portion having a pilot sequence and a cyclic prefix; and transmitting, by the wireless device, the produced signal in the time slot.

8 . The method of claim 7 wherein the pilot sequence of the second portion has a constant amplitude.

9 . The method of claim 7 wherein the cyclic prefix includes a replicated portion of the pilot sequence.

10 . The method of claim 7 wherein the second portion is configured to be processed using a Fast Fourier Transform (FFT)-based channel estimation algorithm.

11 . The method of claim 7 wherein the multiplexed first pilot is multiplexed using Frequency Division Multiplexing (FDM).

12 . A wireless device comprising:
a transceiver; and a processor, wherein: the transceiver is configured to receive a signal in a time slot of a frame, wherein the time slots have variable lengths, the signal having a first portion and a second portion, the first portion and the second portion are located in defined time regions in the slot, the first portion having data and a multiplexed first pilot, wherein the multiplexed first pilot is derived from a pseudo random sequence, the second portion having a pilot sequence and a cyclic prefix, the processor is configured to process the signal and deriving a first channel estimate using the multiplexed first pilot and a second channel estimate using the pilot sequence, and the processor is configured to process the data using the first or the second channel estimate.

13 . The wireless device of claim 12 wherein the pilot sequence of the second portion has a constant amplitude.

14 . The wireless device of claim 12 wherein the cyclic prefix includes a replicated portion of the pilot sequence.

15 . The wireless device of claim 12 wherein the second portion is processed using a Fast Fourier Transform (FFT)-based channel estimation algorithm.

16 . The wireless device of claim 12 wherein the wireless device is a base station.

17 . A method comprising:
producing, by a wireless device, a signal in a time slot of a frame, wherein the time slots have variable lengths, the signal having a first portion and a second portion, the first portion and the second portion are located in defined time regions in the slot, the first portion having data and a multiplexed first pilot, wherein the multiplexed first pilot is derived from a pseudo random sequence, the second portion having a pilot sequence and a cyclic prefix; and processing the signal and deriving a first channel estimate using the multiplexed first pilot and a second channel estimate using the pilot sequence, and processing the data using the first or the second channel estimate.

18 . The method of claim 17 wherein the pilot sequence of the second portion has a constant amplitude.

19 . The method of claim 17 wherein the cyclic prefix includes a replicated portion of the pilot sequence.

20 . The method of claim 17 wherein the second portion is configured to be processed using a Fast Fourier Transform (FFT)-based channel estimation algorithm.

Assignees

• Intellectual Ventures Holding 81 Llc

Inventors

• Anderson Nicholas William

Classifications

• H04L27/2607

  Cyclic extensions · CPC title

• H04J13/20

  having an orthogonal variable spreading factor [OVSF] · CPC title

• H04J13/0077

  Multicode, e.g. multiple codes assigned to one user · CPC title

• H04B2201/70701

  featuring pilot assisted reception · CPC title

• H04L27/2613

  Structure of the reference signals · CPC title