US 2012/0040633 A1 · MULTI-USER INTERFERENCE CANCELLATION IN A SINGLE-CARRIER RADIO RECEIVER

Abstract

A method, apparatus, and radio receiver system for canceling multi-user interference in a single-carrier radio communication system. A front-end receiver such as a RAKE receiver receives a radio signal formatted in a sequence of frames, and outputs a plurality of user signals. A processing selector selects on a frame-by-frame basis, either a first signal processing chain that serially decodes and removes the interference contributions of the user signals, or a second signal processing chain that simultaneously decodes and removes the interference contributions of the user signals in parallel. The processing selector may select the first signal processing chain when the number of user signals is greater than or equal to a threshold value, and may select the second signal processing chain when the number of user signals is less than the threshold value.

Claims18

Dependent claims

A method in a radio receiver node for canceling multi-user interference in a single-carrier radio communication system in which a front-end receiver receives a radio signal formatted in a sequence of frames, and each frame includes a number of user signals, each user signal contributing to the multi-user interference, the method comprising the steps of:

determining for each frame, whether the number of user signals is greater than or equal to a threshold value;
upon determining that the number of user signals is greater than or equal to the threshold value, serially decoding and removing the interference contributions of the user signals one at a time;
and
upon determining that the number of user signals is less than the threshold value, simultaneously decoding and removing the interference contributions of the user signals in parallel.

1 more element

An apparatus in a radio receiver node for canceling multi-user interference in a single-carrier radio communication system in which a front-end receiver receives a radio signal formatted in a sequence of frames, and each frame includes a number of user signals, each user signal contributing to the multi-user interference, the apparatus comprising:

a processor for controlling the apparatus to decode the user signals and remove corresponding interference contributions of each decoded user signal;
and
a first signal processing chain that serially decodes and removes the interference contributions of the user signals, the first signal processing chain including:
means for sorting the user signals according to signal quality in descending order starting with the user signal with the highest signal quality;
a decoder for attempting to decode the user signal having the highest received signal quality, and when the user signal having the highest received signal quality is successfully decoded, for attempting to decode subsequent user signals in descending order of received signal quality;
and
an interference removal unit for removing from the received signal, the interference contribution of user signals that are successfully decoded.

4 more elements

A radio receiver system in a single-carrier radio communication network for receiving a radio signal comprising a plurality of user signals and for canceling multi-user interference between the plurality of received user signals, wherein the radio signal is formatted in a sequence of frames, and each frame includes the plurality of user signals, the receiver system comprising:

a front-end receiver for detecting the radio signal and outputting the plurality of user signals;
a first signal processing chain that serially decodes and removes the interference contributions of the user signals;
a second signal processing chain that simultaneously decodes and removes the interference contributions of the user signals in parallel;
and
a processing selector for selecting the first signal processing chain or the second signal processing chain for processing each received frame.

2 more elements

Dependencies are inferred from the claim text.

Multi-user interference cancellation in a single-carrier radio receiver

Life of this patent

Multi-user interference cancellation in a single-carrier radio receiver

Life of this patent

Abstract

Claims18