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A Direct Spread Code Division Multiple Access Uplink Channel Estimation Method and Device

A link channel and link technology, applied in the field of communication signal processing, can solve the problems of high ADC requirements and large amount of computation

Inactive Publication Date: 2018-03-16
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0044] The purpose of the present invention is to provide a direct spread sequence code division multiple access uplink channel estimation method based on compressed sensing in order to solve the problems of large amount of computation and high requirements for ADC in the prior art

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  • A Direct Spread Code Division Multiple Access Uplink Channel Estimation Method and Device
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  • A Direct Spread Code Division Multiple Access Uplink Channel Estimation Method and Device

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Embodiment Construction

[0092] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0093] In this embodiment, BPSK modulation is adopted, and the number of pilot symbols Q t =8, the pilot signal is all "1", expressed as b v (q)=1.

[0094] Spreading ratio L=256, symbol rate R s =1Kbps, chip rate R c = 256Kchip / s.

[0095] The chip-shaped waveform g(t) is the root raised cosine function, and the unilateral duration is the chip period T c F = 3 times. Expressed as:

[0096]

[0097] The number of users in the system is V=3, and its spreading code is c 1 [[l]],c 2 [[l]],c 3 [[l]], so its baseband signal is

[0098] The maximum number of multipaths for each user is P=3. Without considering the carrier and noise, the complex baseband signal of user v received by the base station is:

[0099]

[0100] For uplink channel estimation, it is required to find out all discernable multipath delays τ v,p and their resp...

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Abstract

The invention relates to a method and device for estimating channel parameters of a direct spread sequence code division multiple access uplink channel based on compressed sensing, and belongs to the technical field of communication signal processing. The device includes two modules of parallel multi-channel compressed sensing receiving and PA‑SLSS iterative search: the parallel multi-channel compressed sensing receiving module is used to multiply, integrate and sample the received signal with a set of observation functions satisfying the RIP condition to obtain the observation vector ;The PA-SLSS iterative search module calls the pre-generated equivalent dictionary matrix, and uses the least squares method to check the linear representation of the observation vector output by the parallel multi-channel compressed sensing receiving module for the column vector group of the equivalent dictionary matrix, and obtains the channel parameter estimation result . Compared with the prior art, the present invention utilizes the structural characteristics of the direct spread sequence code division multiple access uplink signal and its inherent sparse characteristics in the spread spectrum domain, and applies the compressed sensing technology to sample the signal, and its sampling rate is lower than the Nyquist rate , thereby reducing the requirements for the ADC front end.

Description

technical field [0001] The invention relates to compressed sensing technology, in particular to a method and device for estimating channel parameters of a direct spread sequence code division multiple access uplink channel based on compressed sensing, and belongs to the technical field of communication signal processing. Background technique [0002] With the rapid development of modern electronic technology, the electromagnetic environment in space is becoming more and more complex, and the channels are relatively crowded. In military communication, it is even more confronted with various man-made interferences. In order to enhance the reliability of the communication system and increase the channel capacity, Direct-Sequence Code Division Multiple-Access (DS-CDMA) has received extensive attention. The DS-CDMA system is not only the core of civil 3G mobile wireless communication standards, but also widely used in military radio stations, ships and aircraft network communicat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04B1/7097
Inventor 苗夏箐罗士荀王帅安建平
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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