Uniquely Decodable Codes and Decoder for Overloaded Synchronous Cdma Systems Field of Invention

ثبت نشده
چکیده

A recursive method for constructing uniquely decodable codes for overloaded synchronous CDMA systems, Where large signature codes With groWing overloading factors are reconstructed from the small ones. A class of uniquely decod able signature matrices (or encoders) for overloaded synchro nous CDMA are also devised. A decoder for synchronous CDMA systems to extract the user data by a number of comparisons With respect to some prede?ned thresholds.

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Set of uniquely decodable codes for overloaded synchronous CDMA

In this paper, we consider the designing of a new set of Uniquely Decodable Codes (UDC) for uncoded synchronous overloaded Code Division Multiple Access (CDMA) for the number of codes exceeding the assigned code length. For the construction, the proposed recursive method at iterationk generates a matrix that can be classified into k orthogonal subsets of different dimensions. Out of them, all b...

متن کامل

Coding for Multiple Access Communications

An idealized code-division multiple-access (CDMA) system is used as a vehicle to illustrate a new approach to coding for multiple-access channels that aims to achieve reasonable efficiency while avoiding the prohibitive complexity of optimum coding schemes. The new approach combines "partial demodulation" to separate users into roughly independent groups with the creation of "virtual channels" ...

متن کامل

A review on synchronous CDMA systems: optimum overloaded codes, channel capacity, and power control

This paper is a tutorial review on important issues related to code-division multiple-access (CDMA) systems such as channel capacity, power control, and optimum codes; specifically, we consider optimum overloaded codes that achieve errorless transmission in the absence of noise for the binary and nonbinary cases. A survey of lower and upper bounds for the sum channel capacity of such systems is...

متن کامل

Reducing the Limitation on Application of Synchronous Decorrelating Detector Cdma Systems

In CDMA (Code - Division Multiple - Access) systems multi - user accessing of a channel is possible. Under the assumptions of Optimum multi - user and decorrelating detector in CDMA systems. By using signals with zero and / or identical cross correlations, a simple and expandable decorrelating detector with optimum efficiency which can be easily implemented are proposed. Constructing these sign...

متن کامل

Capacity of Synchronous CDMA Systems with Near-Far Effects and Design of Suboptimum Signature Codes

This paper deals with near-far effects on various aspects of Code Division Multiple Access (CDMA) systems. Initially, we propose a new class of codes for over-loaded synchronous wireless CDMA systems that are robust against near-far effects; and then we provide a low complexity decoder for a subclass of such codes. Moreover, bounds for the sum capacity of CDMA systems in the presence of near-fa...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2013