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Method and device for channel estimation in direct-sequence code division multiple-access uplink

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

Inactive Publication Date: 2015-11-04
BEIJING INSTITUTE OF TECHNOLOGYGY
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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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  • Method and device for channel estimation in direct-sequence code division multiple-access uplink

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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 u v ( t ) = Σ l = 0 L - 1 c v [ ...

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Abstract

The present invention relates to a method and device for estimation of channel parameters in a direct-sequence code division multiple-access uplink based on compressed sensing, belonging to the field of technology of communication signal processing. The device provided by the invention comprises a parallel multi-channel compressed sensing receiving module and a PA-SLSS iterative search module, the parallel multi-channel compressed sensing receiving module is used for multiplying received signals by a group of observation functions which meets the requirement of RIP, integrating and sampling the multiplying result so as to obtain observation vectors, and the PA-SLSS iterative search module examines linear expression of the observation vectors output by the parallel multi-channel compressed sensing receiving module relative to column vectors of equivalent dictionary matrix so as to obtain estimated results of the channel parameters through invoking generated equivalent dictionary matrix in advance and the least square method. Compared with the prior art, the structured feature and sparse property inherent in a spread spectrum domain of the direct-sequence code division multiple-access uplink signals are employed, and signals are sampled through the compressed sensing technology, wherein the speed of sampling is lower than the speed of Nyquist, thereby the requirement for the front end of ADC (analog-to-digital converter) is reduced.

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...

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Application Information

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Patent Type & Authority Applications(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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