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Questions tagged [cdma]

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Cross Correlation Peak Value of Wideband signals - The Phase and Sample Offset are related but how

Two CDMA Codes or Gold Codes or PRN Sequencies, i.e. a pattern in time, are cross correlated in the time domain. However one of them is delayed compared to the other. How is the phase argument of the ...
njk7's user avatar
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1 answer
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How to measure process gain of DSSS

I have a replicated a Direct sequence spread spectrum link (schematics taken from ARRL SS handbook) and would like to measure performance characteristics such as process gain. I have 2 questions. I ...
Mohamed Abuain's user avatar
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1 answer
126 views

CDMA using BPSK - Demodulation

I am very much a rookie, so apologies for the terrible knowledge or misconceptions. I'm looking at this mostly in the context of GPS (or sending a signal with a very low SNR ratio). I understand BPSK ...
Nathaniel Girdler's user avatar
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1 answer
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Adding Narrowband Interference to Spread Spectrum Signal in MATLAB (Baseband Model)

I am interested in adding a narrowband interfering signal to my spread spectrum signal. In the waveform model, it's straightforward to generate a narrowband signal within the frequency range of the ...
Digi1's user avatar
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Number of bits in a CDMA system given its Processing Gain

A CDMA system is capable of operating with three different processing gains $G_p$: 16, 32, and 64. It is known that when $G_p=32$, the number of bits per slot is 64. Can we assume that the product of $...
Ketterle's user avatar
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1 answer
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DAC sampling rate when using DSSS/CDMA

I'm currently not sure if I understood DSSS correctly. Following example: We have a shared RF network with around a thousand of users and we want to use CDMA. The RF link should allow the streaming of ...
Stefan Maier's user avatar
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1 answer
163 views

DS-CDMA Spreading Code Length Selection

I'm trying to wrap my head around the process of selecting DS-CDMA spreading codes, and I'm having trouble understanding the tradeoffs of longer codes. For all scenarios described below, I'm using a ...
Jordan's user avatar
  • 121
3 votes
1 answer
79 views

Efficient frequency domain search for reduced number of hypotheses

In CDMA signals (such as GNSS) there are two unknown parameters when one receives the signal, residual carrier frequency and an unknown delay. Assuming the carrier frequency residual is known, what is ...
ban09's user avatar
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6 votes
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91 views

Other Examples of Complete Orthonormal Systems

I am interested in other examples of finite and complete orthogonal basis. I am not confident in my use of the term “complete”, so what I mean specifically is a set of basis vectors that can be used ...
Dan Boschen's user avatar
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