Adaptive Transmission with Mixed Band-AMC and Diversity Modes for Multiuser OFDMA

نویسندگان

  • Sung Bo Sim
  • Yun Hee Kim
  • Kwang Soon Kim
چکیده

In this letter, we propose an adaptive transmission method for an OFDMA system supporting both band-AMC and diversity modes in a frame, simultaneously. In the proposed method, users are classified into the two groups preferring the band-AMC mode or the diversity mode based on their channel parameters. Then the BS performs resource allocation to maximize the throughput. It is observed that the proposed adaptive transmission method can reduce the feedback overhead with negligible performance loss. key words: OFDMA, band-AMC, diversity, resource allocation

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

A Pragmatic Adaptive Transmission Scheme with Low-Rate Feedback Using Two-Step Partial CQI for Multiuser OFDMA Systems

In this paper, we investigate an efficient user selection and sub-band allocation algorithm in which each user transmits two-step partial CQI to reduce the amount of feedback in multi-user downlink OFDMA systems. Simulation results show that we can greatly reduce the feedback rate at the expense of negligible performance degradation compared to the full CQI feedback schemes or that we can great...

متن کامل

Multi-user Mimo Transmission Modes for Transmit Diversity and Spatial Multiplexing in Long Term Evolution

Third Generation Partnership Projects Long Term Evolution –LTE downlink multiuser Multiple Input Multiple Output (MIMO) systems are analyzed in this paper. Two spatial multiplexing and transmit diversity multiuser MIMO schemes .To achieve high throughput required by the downlink LTE system, Adaptive Modulation and Coding (AMC) has to ensure a Block Error Rate (BLER) value . In this paper, we ma...

متن کامل

Efficient Adaptive Transmission Technique for Coded Multiuser OFDMA Systems

In previous literature on adaptive transmission in multiuser OFDMA systems, only uncoded case or capacity (coded with infinite length of codeword) has been considered. In this paper, an adaptive transmission algorithm for coded OFDMA systems with practical codeword lengths is investigated. Also, in order to keep the feedback overhead within a practical range, a two-step partial CQI scheme is ad...

متن کامل

Multiuser Diversity OFDMA using Power Priority Selection and Adaptive Clipping

In recent, orthogonal frequency division multiple access (OFDMA) has been used for a multiuser wireless communication. In a wireless network, the transmitted signal of each user has independent channel fluctuation characteristic. By using this characteristic, OFDMA can achieve the multiuser diversity (MUDiv). Until this time, to achieve a low complexity and performance improvement, the adaptive...

متن کامل

Adaptive Subband Allocation in FH-OFDMA with Channel Aware Frequency Hopping Algorithm

This paper presents a new subband allocation scheme for multiuser OFDMA systems. Adaptive OFDMA systems have focused on adapting the allocation of subcarriers and power to the instantaneous channel conditions of all users. Using frequency hopping pattern in OFDMA system allow users to minimize intercell and intracell interference, and perform frequency diversity. In contrast to conventional FH-...

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:
  • IEICE Transactions

دوره 91-B  شماره 

صفحات  -

تاریخ انتشار 2008